|
type |
Journal Article |
authors |
Wang SA, Lin CI, Zhang J, Ushimaru R, Sasaki E, Liu HW |
title |
Studies of lincosamide formation complete the biosynthetic pathway for lincomycin A |
journal |
Proc Natl Acad Sci U S A |
Activity |
lmbs |
sel |
selected |
ui |
32958639 |
year |
(2020) |
volume |
117 |
number |
40 |
pages |
24794-24801 |
| |
keywords |
biosynthesis; celesticetin; lincomycin; lincosamide; thiosugar. |
abstract |
The structure of lincomycin A consists of the unusual eight-carbon thiosugar core methyllincosamide (MTL) decorated with a pendent N-methylprolinyl moiety. Previous studies on MTL biosynthesis have suggested GDP-ᴅ-erythro-α-ᴅ-gluco-octose and GDP-ᴅ-α-ᴅ-lincosamide as key intermediates in the pathway. However, the enzyme-catalyzed reactions resulting in the conversion of GDP-ᴅ-erythro-α-ᴅ-gluco-octose to GDP-ᴅ-α-ᴅ-lincosamide have not yet been elucidated. Herein, a biosynthetic subpathway involving the activities of four enzymes-LmbM, LmbL, CcbZ, and CcbS (the LmbZ and LmbS equivalents in the closely related celesticetin pathway)-is reported. These enzymes catalyze the previously unknown biosynthetic steps including 6-epimerization, 6,8-dehydration, 4-epimerization, and 6-transamination that convert GDP-ᴅ-erythro-α-ᴅ-gluco-octose to GDP-ᴅ-α-ᴅ-lincosamide. Identification of these reactions completes the description of the entire lincomycin biosynthetic pathway. This work is significant since it not only resolves the missing link in octose core assembly of a thiosugar-containing natural product but also showcases the sophistication in catalytic logic of enzymes involved in carbohydrate transformations. |
fulltext |
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last changed |
2020/11/04 15:55 |
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