Reaction: dTDP-4-amino-4,6-dideoxy-α-D-glucopyranose + S-adenosyl-L-methionine + reduced acceptor = dTDP-3-dehydro-4,6-dideoxy-α-D-glucopyranose + NH3 + L-methionine + 5'-deoxyadenosine + acceptor
For diagram of reaction click here.
Other name(s): desII (gene name); eryCV (gene name); MegCV
Systematic name: dTDP-4-amino-4,6-dideoxy-α-D-glucopyranose ammonia lyase (dTDP-3-dehydro-4,6-dideoxy-α-D-glucopyranose-forming)
Comments: The enzyme, which is a member of the 'AdoMet radical' (radical SAM) family, is involved in biosynthesis of TDP-α-D-desosamine. The reaction starts by the transfer of an electron from the reduced form of the enzyme's [4Fe-4S] cluster to S-adenosyl-L-methionine, spliting it into methionine and the radical 5-deoxyadenosin-5'-yl, which attacks the sugar substrate.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:
1. Szu, P.H., Ruszczycky, M.W., Choi, S.H., Yan, F. and Liu, H.W. Characterization and mechanistic studies of DesII: a radical S-adenosyl-L-methionine enzyme involved in the biosynthesis of TDP-D-desosamine. J. Am. Chem. Soc. 131 (2009) 14030-14042. [PMID: 19746907]
2. Ruszczycky, M.W., Choi, S.H. and Liu, H.W. Stoichiometry of the redox neutral deamination and oxidative dehydrogenation reactions catalyzed by the radical SAM enzyme DesII. J. Am. Chem. Soc. 132 (2010) 2359-2369. [PMID: 20121093]
3. Ruszczycky, M.W., Choi, S.H., Mansoorabadi, S.O. and Liu, H.W. Mechanistic studies of the radical S-adenosyl-L-methionine enzyme DesII: EPR characterization of a radical intermediate generated during its catalyzed dehydrogenation of TDP-D-quinovose. J. Am. Chem. Soc. 133 (2011) 7292-7295. [PMID: 21513273]