The Enzyme Database

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Accepted name: hercynylcysteine S-oxide lyase
Reaction: S-(hercyn-2-yl)-L-cysteine S-oxide + reduced acceptor = ergothioneine + pyruvate + NH3 + acceptor (overall reaction)
(1a) S-(hercyn-2-yl)-L-cysteine S-oxide + H2O = 2-(hydroxysulfanyl)hercynine + pyruvate + NH3
(1b) 2-(hydroxysulfanyl)hercynine + reduced acceptor = ergothioneine + acceptor + H2O (spontaneous)
Glossary: 2-(hydroxysulfanyl)hercynine = Nα,Nα,Nα-trimethyl-2-(hydroxysulfanyl)-L-histidine = 2-sulfenohercynine
ergothioneine = Nα,Nα,Nα-trimethyl-2-sulfanylidene-2,3-dihydro-L-histidine
Other name(s): egtE (gene name)
Systematic name: S-(hercyn-2-yl)-L-cysteine ergothioneine-hydroxysulfanolate-lyase
Comments: Contains pyridoxal 5′-phosphate. The enzyme, characterized from the bacterium Mycobacterium smegmatis, cayalyses the last step in the pathway of ergothioneine biosynthesis. The enzyme forms a 2-(hydroxysulfanyl)hercynine intermediate, which is reduced to ergothioneine non-enzymically by a thiol. In vitro, DTT can serve this function.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Seebeck, F.P. In vitro reconstitution of mycobacterial ergothioneine biosynthesis. J. Am. Chem. Soc. 132 (2010) 6632–6633. [DOI] [PMID: 20420449]
2.  Pluskal, T., Ueno, M. and Yanagida, M. Genetic and metabolomic dissection of the ergothioneine and selenoneine biosynthetic pathway in the fission yeast, S. pombe, and construction of an overproduction system. PLoS One 9:e97774 (2014). [DOI] [PMID: 24828577]
3.  Song, H., Hu, W., Naowarojna, N., Her, A.S., Wang, S., Desai, R., Qin, L., Chen, X. and Liu, P. Mechanistic studies of a novel C-S lyase in ergothioneine biosynthesis: the involvement of a sulfenic acid intermediate. Sci. Rep. 5:11870 (2015). [DOI] [PMID: 26149121]
[EC created 2017]

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