Cysteine synthase CysK (IPR005859)

Short name: CysK

Overlapping homologous superfamilies

Family relationships


Cysteine synthase (O-acetylserine (thiol)-lyase, EC: is the enzyme responsible for the formation of cysteine from O-acetyl-serine and hydrogen sulphide with the concomitant release of acetic acid. In bacteria such two forms of the enzyme are known (genes cysK and cysM). CysK differs from CysM in that it can also use sulphide instead of thiosulphate, to produce cysteine instead of cysteine thiosulphonate.

This entry represents CysK-type cysteine synthases. It includes beta-cyanoalanine synthase, a mitochondrial cysteine synthase-like protein from plants [PMID: 10889265].

GO terms

Biological Process

GO:0006535 cysteine biosynthetic process from serine

Molecular Function

GO:0004124 cysteine synthase activity

Cellular Component

No terms assigned in this category.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.