Genome mining in Streptomyces. Elucidation of the role of Baeyer-Villiger monooxygenases and non-heme iron-dependent dehydrogenase/oxygenases in the final steps of the biosynthesis of pentalenolactone and neopentalenolactone.
The pentalenolactone biosynthetic gene clusters have been cloned and sequenced from two known producers of the sesquiterpenoid antibiotic pentalenolactone, Streptomyces exfoliatus UC5319 and Streptomyces arenae TÜ469. The recombinant enzymes PenE and PntE, from S. exfoliatus and S. arenae, respectively, catalyze the flavin-dependent Baeyer-Villiger oxidation of 1-deoxy-11-oxopentalenic acid (7) to pentalenolactone D (8). Recombinant PenD, PntD, and PtlD, the latter from Streptomyces avermitilis, each catalyze the Fe(2+)-α-ketoglutarate-dependent oxidation of pentalenolactone D (8) to pentalenolactone E (15) and pentalenolactone F (16). Incubation of PenD, PntD, or PtlD with the isomeric neopentalenolactone D (9) gave PL308 (12) and a compound tentatively identified as neopentalenolactone E (14). These results are corroborated by analysis of the ΔpenD and ΔpntD mutants of S. exfoliatus and S. arenae, respectively, both of which accumulate pentalenolactone D but are blocked in production of pentalenolactone as well as the precursors pentalenolactones E and F. Finally, complementation of the previously described S. avermitilis ΔptlE ΔptlD deletion mutant with either penE or pntE gave pentalenolactone D (8), while complemention of the ΔptlE ΔptlD double mutant with pntE plus pntD or penE plus pntD gave pentalenolactone F (16).
Department of Chemistry, Box H, Brown University, Providence, Rhode Island 02912-9108, United States.
Myung-Ji
MJ
Seo
Dongqing
D
Zhu
Saori
S
Endo
Haruo
H
Ikeda
David E
DE
Cane
D016680:Genome, Bacterial; D006418:Heme; D007501:Iron; D006899:Mixed Function Oxygenases / Q000378:metabolism*; D015394:Molecular Structure; D005810:Multigene Family; D010084:Oxidation-Reduction; D010088:Oxidoreductases / Q000378:metabolism*; D012717:Sesquiterpenes / Q000737:chemistry / Q000378:metabolism*; D013302:Streptomyces / Q000201:enzymology* / Q000235:genetics
D012717:Sesquiterpenes; D006418:Heme; D007501:Iron; D006899:Mixed Function Oxygenases; D010088:Oxidoreductases
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