Cloning and sequencing of the kedarcidin biosynthetic gene cluster from Streptoalloteichus sp. ATCC 53650 revealing new insights into biosynthesis of the enediyne family of antitumor antibiotics.

Abstract:

:Enediyne natural product biosynthesis is characterized by a convergence of multiple pathways, generating unique peripheral moieties that are appended onto the distinctive enediyne core. Kedarcidin (KED) possesses two unique peripheral moieties, a (R)-2-aza-3-chloro-β-tyrosine and an iso-propoxy-bearing 2-naphthonate moiety, as well as two deoxysugars. The appendage pattern of these peripheral moieties to the enediyne core in KED differs from the other enediynes studied to date with respect to stereochemical configuration. To investigate the biosynthesis of these moieties and expand our understanding of enediyne core formation, the biosynthetic gene cluster for KED was cloned from Streptoalloteichus sp. ATCC 53650 and sequenced. Bioinformatics analysis of the ked cluster revealed the presence of the conserved genes encoding for enediyne core biosynthesis, type I and type II polyketide synthase loci likely responsible for 2-aza-l-tyrosine and 3,6,8-trihydroxy-2-naphthonate formation, and enzymes known for deoxysugar biosynthesis. Genes homologous to those responsible for the biosynthesis, activation, and coupling of the l-tyrosine-derived moieties from C-1027 and maduropeptin and of the naphthonate moiety from neocarzinostatin are present in the ked cluster, supporting 2-aza-l-tyrosine and 3,6,8-trihydroxy-2-naphthoic acid as precursors, respectively, for the (R)-2-aza-3-chloro-β-tyrosine and the 2-naphthonate moieties in KED biosynthesis.

journal_name

Mol Biosyst

journal_title

Molecular bioSystems

authors

Lohman JR,Huang SX,Horsman GP,Dilfer PE,Huang T,Chen Y,Wendt-Pienkowski E,Shen B

doi

10.1039/c3mb25523a

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

478-91

issue

3

eissn

1742-206X

issn

1742-2051

journal_volume

9

pub_type

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