Cysteine sulfinic acid
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| MeSH | cysteine+sulfinic+acid |
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| Template:Longitem | C3H7NO4S |
| Molar mass | 153.15698 |
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Cysteine sulfinic acid is the organic compound with the nominal formula HO2SCH2CH(NH2)CO2H . It is a rare example of an amino acid bearing a sulfinic acid functional group. It is a white solid that is soluble in water. Like most natural amino acids, it is chiral, only the L-enantiomer occurs in nature, and it exists as the zwitterion at neutral pH. It is an intermediate in cysteine metabolism. It is not a coded amino acid, but is produced post-translationally. Peptides containing the cysteine sulfinic acid residue are substrates for cysteine sulfinic acid reductase.[1]
Cysteine sulfinic acid is derived from cysteine. Cysteine is formed from cystathionine via the cystathionine gamma-lyase enzyme, and is either broken down by cysteine lyase or cystathionine gamma-lyase or enters the cysteine sulfinic acid pathway where it is oxidized by cysteine dioxygenase to form cysteine sulfinic acid. Cysteine sulfinic acid, in turn, is decarboxylated by sulfinoalanine decarboxylase to form hypotaurine, which in turn is oxidized by hypotaurine dehydrogenase to yield taurine.[2] Proteins containing this residue are found at the active site of some nitrile hydratases.[3]
References
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- ↑ Isao Endo, Masaki Nojiri, b, Masanari Tsujimura, Masayoshi Nakasako, Shigehiro Nagashima, Masafumi Yohda, Masafumi Odaka "Focused Review: Fe-type nitrile hydratase"Journal of Inorganic Biochemistry 2001, Volume 83, Issue 4, February 2001, Pages 247–253. Script error: No such module "CS1 identifiers".
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