期刊
CHEMBIOCHEM
卷 16, 期 1, 页码 100-109出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cbic.201402489
关键词
biosynthesis; calicheamicins; enzyme catalysis; methionine gamma-lyase; protein structures
资金
- HKSAR Government [RPC11SC16, FSGRF13SC01]
CalE6 is a previously uncharacterized protein involved in the biosynthesis of calicheamicins in Micromonospora echinospora. It is a pyridoxal-5'-phosphate-dependent enzyme and exhibits high sequence homology to cystathionine gamma-lyases and cystathionine g-synthases. However, it was found to be active towards methionine and to convert this amino acid into a-ketobutyrate, ammonium, and methanethiol. The crystal structure of the cofactor-bound holoenzyme was resolved at 2.0 (A) over cap; it contains two active site residues, Gly105 and Val322, specific for methionine gamma-lyases. Modeling of methionine into the active site allows identification of the active site residues responsible for substrate recognition and catalysis. These findings support that CalE6 is a putative methionine gamma-lyase producing methanethiol as a building block in biosynthesis of calicheamicins.
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