IUBMB Enzyme Nomenclature


Accepted name: 3-α-mycarosylerythronolide B desosaminyl transferase

Reaction: dTDP-D-desosamine + 3-α-L-mycarosylerythronolide B = dTDP + erythromycin D

For diagram of reaction click here.

Glossary: dTDP-D-desosamine = dTDP-3,4,6-trideoxy-3-(dimethylamino)-α-D-xylo-hexopyranose
erythromycin D = (3R,4S,5S,6R,7R,9R,11R,12S,13R,14R)-4-(2,6-dideoxy-3-C-methyl-α-L-ribo-hexopyranosyloxy)-14-ethyl-7,12-dihydroxy-6-[3,4,6-trideoxy-3-(dimethylamino)-β-D-xylo-hexopyranosyloxy]-3,5,7,9,11,13-hexamethyloxacyclotetradecane-2,10-dione
3-O-α-mycarosylerythronolide B = (3R,4S,5R,6R,7R,9R,11R,12S,13R,14R)-4-(2,6-dideoxy-3-C-methyl-α-L-ribo-hexopyranosyloxy)-14-ethyl-6,7,12-trihydroxy-3,5,7,9,11,13-hexamethyloxacyclotetradecane-2,10-dione

Other name(s): EryCIII; dTDP-3-dimethylamino-4,6-dideoxy-α-D-glucopyranose:3-α-mycarosylerythronolide B 3-dimethylamino-4,6-dideoxy-α-D-glucosyltransferase; desosaminyl transferase EryCIII

Systematic name: dTDP-3-dimethylamino-3,4,6-trideoxy-α-D-glucopyranose:3-α-mycarosylerythronolide B 3-dimethylamino-3,4,6-trideoxy-β-D-glucosyltransferase

Comments: The enzyme is involved in erythromycin biosynthesis.

Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, CAS registry number:


1. Yuan, Y., Chung, H.S., Leimkuhler, C., Walsh, C.T., Kahne, D. and Walker, S. In vitro reconstitution of EryCIII activity for the preparation of unnatural macrolides. J. Am. Chem. Soc. 127 (2005) 14128-14129. [PMID: 16218575]

2. Lee, H.Y., Chung, H.S., Hang, C., Khosla, C., Walsh, C.T., Kahne, D. and Walker, S. Reconstitution and characterization of a new desosaminyl transferase, EryCIII, from the erythromycin biosynthetic pathway. J. Am. Chem. Soc. 126 (2004) 9924-9925. [PMID: 15303858]

3. Moncrieffe, M.C., Fernandez, M.J., Spiteller, D., Matsumura, H., Gay, N.J., Luisi, B.F. and Leadlay, P.F. Structure of the glycosyltransferase EryCIII in complex with its activating P450 homologue EryCII. J. Mol. Biol. 415 (2012) 92-101. [PMID: 22056329]

[EC created 2012, modified 2014]

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