2.0 2012-05-31 10:24:35 -0600 2015-09-17 15:41:02 -0600 ECMDB00240 M2MDB000100 Sulfite Sulfite is a doubly negatively charged anion containing 1 sulfur and 3 oxygens. Endogenous sulfite is generated as a consequence of the normal processing of sulfur-containing amino acids. In E.coli, sulfites are involved in 3 metabolic pathways: cysteine and methionine metabolism, taurine and hypotaurine metabolims and sulfur metabolism. (KEGG) Bisulfite Bisulphite SO3 SO3-2 SO<SUB>3</SUB> SO<SUB>3</SUB><SUP>-2</SUP> Sulfite dianion Sulfite ion Sulfite ions Sulfonate Sulfonic acid Sulfur trioxide Sulfuric anhydride Sulphite Sulphite dianion Sulphite ion Sulphite ions Sulphonate Sulphonic acid Sulphur trioxide Sulphuric anhydride Trioxosulfate(2-) Trioxosulfate(IV) Trioxosulfuric acid(2-) Trioxosulfuric acid(iv) Trioxosulphate(2-) Trioxosulphate(IV) Trioxosulphuric acid(2-) Trioxosulphuric acid(iv) O3S 80.063 79.956814556 sulfurous acid sulfurous acid 14265-45-3 [O-]S([O-])=O InChI=1S/H2O3S/c1-4(2)3/h(H2,1,2,3)/p-2 LSNNMFCWUKXFEE-UHFFFAOYSA-L Solid Cytosol Extra-organism Periplasm logp -1.2 ChemAxon pka_strongest_acidic 1.7 ChemAxon iupac sulfurous acid ChemAxon average_mass 80.063 ChemAxon mono_mass 79.956814556 ChemAxon smiles [O-]S([O-])=O ChemAxon formula O3S ChemAxon inchi InChI=1S/H2O3S/c1-4(2)3/h(H2,1,2,3)/p-2 ChemAxon inchikey LSNNMFCWUKXFEE-UHFFFAOYSA-L ChemAxon polar_surface_area 57.53 ChemAxon refractivity 12.33 ChemAxon polarizability 5.76 ChemAxon rotatable_bond_count 0 ChemAxon acceptor_count 3 ChemAxon donor_count 2 ChemAxon physiological_charge -1 ChemAxon formal_charge 0 ChemAxon Cysteine and methionine metabolism ec00270 Sulfur metabolism The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. The alkyl sulfate is dehydrogenated and along with oxygen is converted to sulfite and an aldehyde by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW000922 ec00920 Metabolic Taurine and hypotaurine metabolism ec00430 Microbial metabolism in diverse environments ec01120 Metabolic pathways eco01100 Taurine Metabolism Taurine is incorporated into the cytoplasm through a taurine ABC transporter. Once inside the cytoplasm, taurine interacts with an oxoglutaric acid and an oxygen through a taurine dioxygenase resulting in the release of succinic acid, sulfite , aminoacetaldehyde and carbon dioxide PW000774 Metabolic Taurine Metabolism I Taurine is incorporated into the cytoplasm through a taurine ABC transporter. Once inside the cytoplasm, taurine interacts with an oxoglutaric acid and an oxygen through a taurine dioxygenase resulting in the release of succinic acid, sulfite , aminoacetaldehyde and carbon dioxide PW001028 Metabolic cysteine biosynthesis The pathway of cysteine biosynthesis is a two-step conversion starting from L-serine and yielding L-cysteine. L-serine biosynthesis is shown for context. L-cysteine can also be synthesized from sulfate derivatives. The process through L-serine involves a serine acetyltransferase that produces a O-acetylserine which reacts together with hydrogen sulfide through a cysteine synthase complex in order to produce L-cysteine and acetic acid. Hydrogen sulfide is produced from a sulfate. Sulfate reacts with sulfate adenylyltransferase to produce adenosine phosphosulfate. This compound in turn is phosphorylated through a adenylyl-sulfate kinase into a phosphoadenosine phosphosulfate which in turn reacts with a phosphoadenosine phosphosulfate reductase to produce a sulfite. The sulfite reacts with a sulfite reductase to produce the hydrogen sulfide. This pathway is regulated at the genetic level in its second step, wtih both cysteine synthase isozymes being under the positive control of the cysteine-responsive transcription factor CysB. It is also subject to very strong feedback inhibition of its first step by the final pathway product, cysteine. Although two cysteine synthase isozymes exist, only cysteine synthase A (CysK) forms a complex with serine acetyltransferase. CysK is also the only one of the two cysteine synthases that is required for cell viability on cysteine-free medium. Both steps in this pathway are reversible. Based on genetic and proteomic data, it appears that the cysteine synthases may actually act as a sulfur scavenging system during sulfur starvation, stripping sulfur off of L-cysteine, generating any number of variant amino acids in the process. PW000800 Metabolic sulfur metabolism (butanesulfonate) The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate, in this case 1-butanesulfonate, into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. 1-butanesulfonate is dehydrogenated and along with oxygen is converted to sulfite and betaine aldehyde by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW000923 Metabolic sulfur metabolism (butanesulfonate/butanal) The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate, in this case 1-butanesulfonate, into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. 1-butanesulfonate is dehydrogenated and along with oxygen is converted to sulfite and butanal by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW001014 Metabolic sulfur metabolism (ethanesulfonate) The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate, in this case ethanesulfonate, into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. Ethanesulfonate is dehydrogenated and along with oxygen is converted to sulfite and betaine aldehyde by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW000925 Metabolic sulfur metabolism (isethionate) The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate, in this case isethionate, into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. Isethionate is dehydrogenated and along with oxygen is converted to sulfite and betaine aldehyde by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW000926 Metabolic sulfur metabolism (methanesulfonate) The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate, in this case methanesulfonate, into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. Methanesulfonate is dehydrogenated and along with oxygen is converted to sulfite and an aldehyde by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW000927 Metabolic sulfur metabolism (propanesulfonate) The sulfur metabolism pathway starts in three possible ways. The first is the uptake of sulfate through an active transport reaction via a sulfate transport system containing an ATP-binding protein which hydrolyses ATP. Sulfate is converted by the sulfate adenylyltransferase enzymatic complex to adenosine phosphosulfate through the addition of adenine from a molecule of ATP, along with one phosphate group. Adenosine phosphosulfate is further converted to phoaphoadenosine phosphosulfate through an ATP hydrolysis and dehydrogenation reaction by the adenylyl-sulfate kinase. Phoaphoadenosine phosphosulfate is finally dehydrogenated and converted to sulfite by phosphoadenosine phosphosulfate reductase. This reaction requires magnesium, and adenosine 3',5'-diphosphate is the bi-product. A thioredoxin is also oxidized. Sulfite can also be produced from the dehydrogenation of cyanide along with the conversion of thiosulfate to thiocyanate by the thiosulfate sulfurtransferase enzymatic complex. Sulfite next undergoes a series of reactions that lead to the production of pyruvic acid, which is a precursor for pathways such as gluconeogenesis. The first reaction in this series is the conversion of sulfite to hydrogen sulfide through hygrogenation and the deoxygenation of sulfite to form a water molecule. The reaction is catalyzed by the sulfite reductase [NADPH] flavoprotein alpha and beta components. Siroheme, 4Fe-4S, flavin mononucleotide, and FAD function as cofactors or prosthetic groups. Hydrogen sulfide next undergoes dehydrogenation in a reversible reaction to form L-Cysteine and acetic acid, via the cysteine synthase complex and the coenzyme pyridoxal 5'-phosphate. L-Cysteine is dehydrogenated and converted to 2-aminoacrylic acid (a bronsted acid) and hydrogen sulfide(which may be reused) by a larger enzymatic complex composed of cysteine synthase A/B, protein malY, cystathionine-β-lyase, and tryptophanase, along with the coenzyme pyridoxal 5'-phosphate. 2-aminoacrylic acid isomerizes to 2-iminopropanoate, which along with a water molecule and a hydrogen ion is lastly converted to pyruvic acid and ammonium in a spontaneous fashion. The second possible initial starting point for sulfur metabolism is the import of taurine(an alternate sulfur source) into the cytoplasm via the taurine ABC transporter complex. Taurine, oxoglutaric acid, and oxygen are converted to sulfite by the alpha-ketoglutarate-dependent taurine dioxygenase. Carbon dioxide, succinic acid, and aminoacetaldehyde are bi-products of this reaction. Sulfite next enters pyruvic acid synthesis as already described. The third variant of sulfur metabolism starts with the import of an alkyl sulfate, in this case 3-(N-morpholino)propanesulfonate, into the cytoplasm via an aliphatic sulfonate ABC transporter complex which hydrolyses ATP. 3-(N-morpholino)propanesulfonate is dehydrogenated and along with oxygen is converted to sulfite and betaine aldehyde by the FMNH2-dependent alkanesulfonate monooxygenase enzyme. Water and flavin mononucleotide(which is used in a subsequent reaction as a prosthetic group) are also produced. Sulfite is next converted to pyruvic acid by the process already described. PW000924 Metabolic Thiosulfate Disproportionation III Thiosulfate sulfurtransferase is more often referred to by the name rhodanese, from the German word for thiocyanate, "rhodanid". The enzyme catalyzes the transfer of a sulfur atom from suitable sulfur donors to nucleophilic sulfur acceptors. The original description of rhodanese, purified from bovine mitochondria, used thiosulfate and cyanide for this purpose. Rhodanese is a widespread enzyme, and has been detected in many major phyla, both prokaryotic and eukaryotic. Despite its ubiquity, the physiological role of rhodanese has not yet been established unambiguously. It has been suggested that rhodanese is involved in detoxification of cyanide in both mammals and bacteria. It has also been proposed that rhodanese, using the dithiol dihydrolipoate as the sulfur acceptor, may act as a sulfur insertase involved in the formation of prosthetic groups in iron-sulfur proteins, such as ferredoxin. (EcoCyc) PW002060 Metabolic sulfate reduction I (assimilatory) SO4ASSIM-PWY two-component alkanesulfonate monooxygenase ALKANEMONOX-PWY taurine degradation IV PWY0-981 thiosulfate disproportionation III (rhodanese) PWY-5350 Specdb::CMs 9618 Specdb::CMs 171217 Specdb::MsMs 23546 Specdb::MsMs 23547 Specdb::MsMs 23548 Specdb::MsMs 30344 Specdb::MsMs 30345 Specdb::MsMs 30346 Specdb::MsMs 1218074 Specdb::MsMs 1218075 Specdb::MsMs 1218076 Specdb::MsMs 2784079 Specdb::MsMs 2784080 Specdb::MsMs 2784081 Specdb::MsMs 2920975 Specdb::MsMs 2920976 Specdb::MsMs 2920977 HMDB00240 1099 1068 C00094 17359 SO3 SO3 Sulfite Keseler, I. M., Collado-Vides, J., Santos-Zavaleta, A., Peralta-Gil, M., Gama-Castro, S., Muniz-Rascado, L., Bonavides-Martinez, C., Paley, S., Krummenacker, M., Altman, T., Kaipa, P., Spaulding, A., Pacheco, J., Latendresse, M., Fulcher, C., Sarker, M., Shearer, A. G., Mackie, A., Paulsen, I., Gunsalus, R. P., Karp, P. D. (2011). "EcoCyc: a comprehensive database of Escherichia coli biology." Nucleic Acids Res 39:D583-D590. 21097882 Kanehisa, M., Goto, S., Sato, Y., Furumichi, M., Tanabe, M. (2012). "KEGG for integration and interpretation of large-scale molecular data sets." Nucleic Acids Res 40:D109-D114. 22080510 Winder, C. L., Dunn, W. B., Schuler, S., Broadhurst, D., Jarvis, R., Stephens, G. M., Goodacre, R. (2008). "Global metabolic profiling of Escherichia coli cultures: an evaluation of methods for quenching and extraction of intracellular metabolites." Anal Chem 80:2939-2948. 18331064 Yannai, Shmuel. (2004) Dictionary of food compounds with CD-ROM: Additives, flavors, and ingredients. Boca Raton: Chapman & Hall/CRC. Dorain, P. B.; Von Raben, K. U.; Chang, R. K.; Laube, B. L. Catalytic formation of sulfite and sulfate ions from sulfur dioxide on silver observed by surface-enhanced Raman scattering. Chemical Physics Letters (1981), 84(2), 405-9. http://hmdb.ca/system/metabolites/msds/000/000/175/original/HMDB00240.pdf?1358463412 Thiosulfate sulfurtransferase glpE P0A6V5 GLPE_ECOLI glpE http://ecmdb.ca/proteins/P0A6V5.xml Cysteine synthase A P0ABK5 CYSK_ECOLI cysK http://ecmdb.ca/proteins/P0ABK5.xml Thioredoxin-2 P0AGG4 THIO2_ECOLI trxC http://ecmdb.ca/proteins/P0AGG4.xml Cysteine synthase B P16703 CYSM_ECOLI cysM http://ecmdb.ca/proteins/P16703.xml Sulfite reductase [NADPH] hemoprotein beta-component P17846 CYSI_ECOLI cysI http://ecmdb.ca/proteins/P17846.xml Phosphoadenosine phosphosulfate reductase P17854 CYSH_ECOLI cysH http://ecmdb.ca/proteins/P17854.xml 3-mercaptopyruvate sulfurtransferase P31142 THTM_ECOLI sseA http://ecmdb.ca/proteins/P31142.xml Alpha-ketoglutarate-dependent taurine dioxygenase P37610 TAUD_ECOLI tauD http://ecmdb.ca/proteins/P37610.xml Sulfite reductase [NADPH] flavoprotein alpha-component P38038 CYSJ_ECOLI cysJ http://ecmdb.ca/proteins/P38038.xml Thiosulfate sulfurtransferase YnjE P78067 YNJE_ECOLI ynjE http://ecmdb.ca/proteins/P78067.xml FMN reductase P80644 SSUE_ECOLI ssuE http://ecmdb.ca/proteins/P80644.xml Alkanesulfonate monooxygenase P80645 SSUD_ECOLI ssuD http://ecmdb.ca/proteins/P80645.xml Putative aliphatic sulfonates transport permease protein ssuC P75851 SSUC_ECOLI ssuC http://ecmdb.ca/proteins/P75851.xml Glutaredoxin-4 P0AC69 GLRX4_ECOLI grxD http://ecmdb.ca/proteins/P0AC69.xml Thiosulfate sulfurtransferase PspE P23857 PSPE_ECOLI pspE http://ecmdb.ca/proteins/P23857.xml Glutaredoxin-3 P0AC62 GLRX3_ECOLI grxC http://ecmdb.ca/proteins/P0AC62.xml Glutaredoxin-2 P0AC59 GLRX2_ECOLI grxB http://ecmdb.ca/proteins/P0AC59.xml Glutaredoxin-1 P68688 GLRX1_ECOLI grxA http://ecmdb.ca/proteins/P68688.xml Thioredoxin-1 P0AA25 THIO_ECOLI trxA http://ecmdb.ca/proteins/P0AA25.xml Putative aliphatic sulfonates transport permease protein ssuC P75851 SSUC_ECOLI ssuC http://ecmdb.ca/proteins/P75851.xml Outer membrane protein N P77747 OMPN_ECOLI ompN http://ecmdb.ca/proteins/P77747.xml Outer membrane pore protein E P02932 PHOE_ECOLI phoE http://ecmdb.ca/proteins/P02932.xml Outer membrane protein F P02931 OMPF_ECOLI ompF http://ecmdb.ca/proteins/P02931.xml Outer membrane protein C P06996 OMPC_ECOLI ompC http://ecmdb.ca/proteins/P06996.xml glutaredoxin + Phosphoadenosine phosphosulfate > glutaredoxin +2 Hydrogen ion + Adenosine 3',5'-diphosphate + Sulfite Phosphoadenosine phosphosulfate + Reduced Thioredoxin >2 Hydrogen ion + Adenosine 3',5'-diphosphate + Sulfite + Oxidized Thioredoxin 5 Hydrogen ion + 3 NADPH + Sulfite <>3 Water + Hydrogen sulfide +3 NADP R00858 SULFITE-REDUCT-RXN alpha-Ketoglutarate + Oxygen + Taurine <> Aminoacetaldehyde + Carbon dioxide + Hydrogen ion + Sulfite + Succinic acid R05320 FMNH + Oxygen + Sulfoacetate > Flavin Mononucleotide + Glyoxylic acid + Hydrogen ion + Water + Sulfite FMNH + Isethionic acid + Oxygen > Flavin Mononucleotide + Glycolaldehyde + Hydrogen ion + Water + Sulfite RXN-13418 FMNH + Methanesulfonate + Oxygen > Formaldehyde + Flavin Mononucleotide + Hydrogen ion + Water + Sulfite Butanesulfonate + FMNH + Oxygen > Butanal + Flavin Mononucleotide + Hydrogen ion + Water + Sulfite RXN0-6973 Ethanesulfonate + FMNH + Oxygen > Acetaldehyde + Flavin Mononucleotide + Hydrogen ion + Water + Sulfite Hydrogen cyanide + Thiosulfate > Hydrogen ion + Sulfite + Thiocyanate Hydrogen sulfide + 3 NADP + 3 Water <> Sulfite +3 NADPH +3 Hydrogen ion R00858 Thiosulfate + Cyanide <> Sulfite + Thiocyanate R01931 Thioredoxin + Phosphoadenosine phosphosulfate + Thioredoxin disulfide <> Thioredoxin disulfide + Sulfite + Adenosine 3',5'-diphosphate + Thioredoxin R02021 3-Mercaptopyruvic acid + Sulfite <> Thiosulfate + Pyruvic acid R03105 O-Acetylserine + Thiosulfate + Thioredoxin + Hydrogen ion <> L-Cysteine + Sulfite + Thioredoxin disulfide + Acetic acid R04859 Taurine + alpha-Ketoglutarate + Oxygen <> Sulfite + Aminoacetaldehyde + Succinic acid + Carbon dioxide R05320 Hydrogen ion + Sulfite <> bisulfite RXN-8315 3-Sulfinoalanine + Water Hydrogen ion + L-Alanine + Sulfite RXN0-279 an alkanesulfonate + Oxygen + FMNH > an aldehyde + Sulfite + Water + Flavin Mononucleotide + Hydrogen ion RXN0-280 Taurine + Oxoglutaric acid + Oxygen > Hydrogen ion + Aminoacetaldehyde + Sulfite + Succinic acid + Carbon dioxide RXN0-299 Butanesulfonate + Oxygen + FMNH > Butanal + Sulfite + Water + Flavin Mononucleotide + Hydrogen ion RXN0-6973 Water + NADP + Hydrogen sulfide < Hydrogen ion + NADPH + Sulfite SULFITE-REDUCT-RXN Adenosine 3',5'-diphosphate + Sulfite + thioredoxin disulfide > Phosphoadenosine phosphosulfate + thioredoxin Hydrogen sulfide + 3 NADP + 3 Water > Sulfite +3 NADPH Thiosulfate + Hydrogen cyanide > Sulfite + Thiocyanate An alkanesufonate (R-CH(2)-SO(3)H) + FMNH(2) + Oxygen > an aldehyde (R-CHO) + Flavin Mononucleotide + Sulfite + Water Taurine + Oxoglutaric acid + Oxygen > Sulfite + Aminoacetaldehyde + Succinic acid + Carbon dioxide Alkanesulfonate + FMNH + Oxygen <> Aldehyde + Flavin Mononucleotide + Sulfite + Water R07210 Taurine + Oxoglutaric acid + Oxygen > Sulfite + Succinic acid + Aminoacetaldehyde + Carbon dioxide + Sulfite PW_R002558 Taurine + Oxoglutaric acid + Oxygen > Sulfite + Succinic acid + Carbon dioxide + Hydrogen ion + Aminoacetaldehyde + Sulfite PW_R003461 3 NADPH + 5 Hydrogen ion + Sulfite + 3 NADPH + Sulfite > Hydrogen sulfide +3 Water +3 NADP PW_R002849 Sulfite + 3 NADPH + 5 Hydrogen ion + Sulfite + 3 NADPH >3 Water + NADP + Hydrogen sulfide PW_R003464 Sulfide + Water + 3 NADP > Sulfite +3 NADPH + Sulfite +3 NADPH PW_R003839 Phosphoadenosine phosphosulfate + reduced thioredoxin > Sulfite +2 Hydrogen ion + Adenosine 3',5'-diphosphate +2 oxidized thioredoxin + Sulfite + Adenosine 3',5'-diphosphate PW_R002850 Phosphoadenosine phosphosulfate + reduced thioredoxin > Sulfite + oxidized thioredoxin + Hydrogen ion + Adenosine 3',5'-diphosphate + Sulfite + Adenosine 3',5'-diphosphate PW_R003460 alkylsulfonate + FMNH2 + Oxygen > Betaine aldehyde + Sulfite + Flavin Mononucleotide + Water +2 Hydrogen ion + Sulfite PW_R003462 Butanesulfonate + Oxygen + FMNH2 > Hydrogen ion + Water + Sulfite + Flavin Mononucleotide + Betaine aldehyde + Sulfite PW_R003467 Oxygen + FMNH2 + 3-(N-morpholino)propanesulfonate > Sulfite + Water + Hydrogen ion + Flavin Mononucleotide + Betaine aldehyde + Sulfite PW_R003468 ethanesulfonate + Oxygen + FMNH2 > Hydrogen ion + Water + Flavin Mononucleotide + Sulfite + Betaine aldehyde + Sulfite PW_R003469 isethionate + Oxygen + FMNH2 > Betaine aldehyde + Flavin Mononucleotide + Hydrogen ion + Water + Sulfite + Sulfite PW_R003470 Oxygen + methanesulfonate + FMNH2 + Methanesulfonate > Hydrogen ion + Water + Flavin Mononucleotide + Sulfite + Betaine aldehyde + Sulfite PW_R003471 Cyanide + Thiosulfate + Cyanide + Thiosulfate > Thiocyanate + Sulfite + Hydrogen ion + Thiocyanate + Sulfite PW_R003463 Hydrogen cyanide + Thiosulfate > Thiocyanate + Sulfite +2 Hydrogen ion PW_R006013 Thiosulfate + Cyanide <> Sulfite + Thiocyanate Thioredoxin + Phosphoadenosine phosphosulfate + Thioredoxin disulfide <> Sulfite + Adenosine 3',5'-diphosphate 5 Hydrogen ion + 3 NADPH + Sulfite <>3 Water + Hydrogen sulfide +3 NADP Alkanesulfonate + FMNH + Oxygen <> Aldehyde + Flavin Mononucleotide + Sulfite + Water alpha-Ketoglutarate + Oxygen + Taurine <> Aminoacetaldehyde + Carbon dioxide + Hydrogen ion + Sulfite + Succinic acid Taurine + alpha-Ketoglutarate + Oxygen <> Sulfite + Aminoacetaldehyde + Succinic acid + Carbon dioxide Thiosulfate + Cyanide <> Sulfite + Thiocyanate 5 Hydrogen ion + 3 NADPH + Sulfite <>3 Water + Hydrogen sulfide +3 NADP alpha-Ketoglutarate + Oxygen + Taurine <> Aminoacetaldehyde + Carbon dioxide + Hydrogen ion + Sulfite + Succinic acid