Cysteine sulfinic acid

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Cysteine sulfinic acid
Skeletal formula
Ball-and-stick model
IUPAC name
2-amino-3-sulfinopropanoic acid
3D model (JSmol)
MeSH cysteine+sulfinic+acid
Molar mass 153.15698
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Cysteine sulfinic acid is an amino acid containing a sulfinic acid functional group. It is a white solid that is soluble in water. It is an intermediate in cysteine metabolism. It is not a coded amino acid, but is produced post-translationally. Its formation is catalyzed by the enzyme cysteine dioxygenase.

Proteins containing this residue are found at the active site of some nitrile hydratases.[1]


  1. ^ 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. doi:10.1016/S0162-0134(00)00171-9