Genetic Engineering and Heterologous Expression of the Disorazol Biosynthetic Gene Cluster Via Red/ET Recombineering

Overview

Journal Sci Rep

Specialty Science

Date 2016 Feb 16

PMID 26875499

Citations 17

Authors

Qiang Tu

Jennifer Herrmann

Shengbiao Hu

Ritesh Raju

Xiaoying Bian

Youming Zhang

Rolf Muller

Affiliations

Soon will be listed here.

Abstract

Disorazol, a macrocyclic polykitide produced by the myxobacterium Sorangium cellulosum So ce12 and it is reported to have potential cytotoxic activity towards several cancer cell lines, including multi-drug resistant cells. The disorazol biosynthetic gene cluster (dis) from Sorangium cellulosum (So ce12) was identified by transposon mutagenesis and cloned in a bacterial artificial chromosome (BAC) library. The 58-kb dis core gene cluster was reconstituted from BACs via Red/ET recombineering and expressed in Myxococcus xanthus DK1622. For the first time ever, a myxobacterial trans-AT polyketide synthase has been expressed heterologously in this study. Expression in M. xanthus allowed us to optimize the yield of several biosynthetic products using promoter engineering. The insertion of an artificial synthetic promoter upstream of the disD gene encoding a discrete acyl transferase (AT), together with an oxidoreductase (Or), resulted in 7-fold increase in disorazol production. The successful reconstitution and expression of the genetic sequences encoding for these promising cytotoxic compounds will allow combinatorial biosynthesis to generate novel disorazol derivatives for further bioactivity evaluation.

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