The Enzyme Database

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EC 2.8.1.7     
Accepted name: cysteine desulfurase
Reaction: L-cysteine + acceptor = L-alanine + S-sulfanyl-acceptor (overall reaction)
(1a) L-cysteine + [enzyme]-cysteine = L-alanine + [enzyme]-S-sulfanylcysteine
(1b) [enzyme]-S-sulfanylcysteine + acceptor = [enzyme]-cysteine + S-sulfanyl-acceptor
For diagram of moco biosynthesis, click here
Other name(s): IscS; NIFS; NifS; SufS; cysteine desulfurylase
Systematic name: L-cysteine:acceptor sulfurtransferase
Comments: A pyridoxal-phosphate protein. The sulfur from free L-cysteine is first transferred to a cysteine residue in the active site, and then passed on to various other acceptors. The enzyme is involved in the biosynthesis of iron-sulfur clusters, thio-nucleosides in tRNA, thiamine, biotin, lipoate and pyranopterin (molybdopterin) [2]. In Azotobacter vinelandii, this sulfur provides the inorganic sulfide required for nitrogenous metallocluster formation [1].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 149371-08-4
References:
1.  Zheng, L.M., White, R.H., Cash, V.L., Jack, R.F. and Dean, D.R. Cysteine desulfurase activity indicates a role for NIFS in metallocluster biosynthesis. Proc. Natl. Acad. Sci. USA 90 (1993) 2754–2758. [PMID: 8464885]
2.  Mihara, H. and Esaki, N. Bacterial cysteine desulfurases: Their function and mechanisms. Appl. Microbiol. Biotechnol. 60 (2002) 12–23. [PMID: 12382038]
3.  Frazzon, J. and Dean, D.R. Formation of iron-sulfur clusters in bacteria: An emerging field in bioinorganic chemistry. Curr. Opin. Chem. Biol. 7 (2003) 166–173. [PMID: 12714048]
[EC 2.8.1.7 created 2003, modified 2011]
 
 


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