Bioconversion of 12-, 14-, and 16-membered ring aglycones to glycosylated macrolides in an engineered strain of Streptomyces venezuelae.
To develop a system for combinatorial biosynthesis of glycosylated macrolides, Streptomyces venezuelae was genetically manipulated to be deficient in the production of its macrolide antibiotics by deletion of the entire biosynthetic gene cluster encoding the pikromycin polyketide synthases and desosamine biosynthetic enzymes. Two engineered deoxysugar biosynthetic pathways for the biosynthesis of thymidine diphosphate (TDP)-D-quinovose or TDP-D-olivose in conjunction with the glycosyltransferase-auxiliary protein pair DesVII/DesVIII derived from S. venezuelae were expressed in the mutant strain. Feeding the representative 12-, 14-, and 16-membered ring macrolactones including 10-deoxymethynolide, narbonolide, and tylactone, respectively, to each mutant strain capable of producing TDP-D-quinovose or TDP-D-olivose resulted in the successful production of the corresponding quinovose- and olivose-glycosylated macrolides. In mutant strains where the DesVII/DesVIII glycosyltransferase-auxiliary protein pair was replaced by TylMII/TylMIII derived from Streptomyces fradiae, quinovosyl and olivosyl tylactone were produced; however, neither glycosylated 10-deoxymethynolide nor narbonolide were generated, suggesting that the glycosyltransferase TylMII has more stringent substrate specificity toward its aglycones than DesVII. These results demonstrate successful generation of structurally diverse hybrid macrolides using a S. venezuelae in vivo system and provide further insight into the substrate flexibility of glycosyltransferases.
Interdisciplinary Program of Biochemical Engineering and Biotechnology, Seoul National University, San 56-1, Shilim-dong, Gwanak-gu, Seoul 151-742, South Korea.
Won Seok
WS
Jung
Ah Reum
AR
Han
Jay Sung Joong
JS
Hong
Sung Ryeol
SR
Park
Cha Yong
CY
Choi
Je Won
JW
Park
Yeo Joon
YJ
Yoon
D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000378:metabolism; D017353:Gene Deletion; D005818:Genetic Engineering; D006031:Glycosylation; D018942:Macrolides / Q000737:chemistry* / Q000378:metabolism*; D015394:Molecular Structure; D013302:Streptomyces / Q000235:genetics* / Q000378:metabolism*; D013379:Substrate Specificity
D000900:Anti-Bacterial Agents; D018942:Macrolides