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Characterization of the terminal activation step catalyzed by oxygenase CmmOIV of the chromomycin biosynthetic pathway from Streptomyces griseus.

ABSTRACT: Inactivation and initial interrogation of key oxygenase CmmOIV of the biosynthetic pathway of chromomycin A(3) in Streptomyces griseus ssp. griseus revealed that a completely methylated and acetylated prechromomycin is the preferred substrate of this enzyme. This suggests that the three sugar decoration reactions, two O-acetylations and an O-methylation, which were previously believed to occur as the final steps of chromomycin A(3) biosynthesis, indeed take place prior to the CmmOIV reaction. Upon inactivation of CmmOIV, four new compounds accumulated; the fully decorated prechromomycin and its incompletely acetylated precursor along with a diketoprechromomycin-type compound were fully characterized and assayed with CmmOIV.

SUBMITTER: Bosserman MA

PROVIDER: S-EPMC3043137 | biostudies-literature | 2011 Mar

REPOSITORIES: biostudies-literature

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Characterization of the terminal activation step catalyzed by oxygenase CmmOIV of the chromomycin biosynthetic pathway from Streptomyces griseus.

Bosserman Mary A MA Flórez Ana B AB Shaaban Khaled A KA Braña Alfredo F AF Salas Jose A JA Méndez Carmen C Rohr Jürgen J

Biochemistry 20110202 8

Inactivation and initial interrogation of key oxygenase CmmOIV of the biosynthetic pathway of chromomycin A(3) in Streptomyces griseus ssp. griseus revealed that a completely methylated and acetylated prechromomycin is the preferred substrate of this enzyme. This suggests that the three sugar decoration reactions, two O-acetylations and an O-methylation, which were previously believed to occur as the final steps of chromomycin A(3) biosynthesis, indeed take place prior to the CmmOIV reaction. Up ...[more]

PMID: 21244022

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