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Ribosylhopane, a Novel Bacterial Hopanoid, as Precursor of C 35 Bacteriohopanepolyols in Streptomyces coelicolor A3(2)
Author(s) -
Liu Wenjun,
Sakr Elias,
Schaeffer Philippe,
Talbot Helen M.,
Donisi Janina,
Härtner Thomas,
Kannenberg Elmar,
Takano Eriko,
Rohmer Michel
Publication year - 2014
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.201402261
Subject(s) - streptomyces coelicolor , biology , biochemistry , streptomyces albus , hopanoids , rhodococcus , microbiology and biotechnology , mutant , actinomycetales , streptomyces , gene cluster , bacteria , enzyme , gene , genetics , paleontology , structural basin , source rock
Wild‐type Streptomyces coelicolor A3(2) produces aminobacteriohopanetriol as the only elongated C 35 hopanoid. The hopanoid phenotype of two mutants bearing a deletion of genes from a previously identified hopanoid biosynthesis gene cluster provides clues to the formation of C 35 bacteriohopanepolyols. orf14 encodes a putative nucleosidase; its deletion induces the accumulation of adenosylhopane as it cannot be converted into ribosylhopane. orf18 encodes a putative transaminase; its deletion results in the accumulation of adenosylhopane, ribosylhopane, and bacteriohopanetetrol. Ribosylhopane was postulated twenty years ago as a precursor for bacterial hopanoids but was never identified in a bacterium. Absence of the transaminase encoded by orf18 prevents the reductive amination of ribosylhopane into aminobacteriohopanetriol and induces its accumulation. Its reduction by an aldose‐reductase‐like enzyme produces bacteriohopanetetrol, which is normally not present in S . coelicolor .