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Oxytetracycline biosynthesis improvement in Streptomyces rimosus following duplication of minimal PKS genes

Paper ID Volume ID Publish Year Pages File Format Full-Text
17143 42646 2012 7 PDF Available
Title
Oxytetracycline biosynthesis improvement in Streptomyces rimosus following duplication of minimal PKS genes
Abstract

Oxytetracycline (OTC) is a widely used antibiotic, which is commercially produced by Streptomyces rimosus. The type II minimal polyketide synthases (minimal PKS) genes of the oxytetracycline biosynthesis cluster in S. rimosus, consisting of oxyA, oxyB and oxyC, are involved in catalyzing 19-C chain building by the condensation of eight malonyl-CoA groups to form the starting polyketide. This study aimed to investigate the effects of overexpression of the minimal PKS gene in a model S. rimosus strain (M4018) and in an industrial overproducer (SR16) by introduction of a second copy of the gene into the chromosome. Increased levels of oxyA, oxyB and oxyC gene transcription were monitored using reverse transcription quantitative real-time PCR. Overexpression of the minimal PKS gene elicited retardation of cell growth and a significant improvement in OTC production in corresponding mutants (approximately 51.2% and 32.9% in M4018 and SR16 mutants respectively). These data indicate that the minimal PKS plays an important role in carbon flux redirection from cell growth pathways to OTC biosynthesis pathways.

► Duplication of minimal PKS genes in Streptomyces rimosus. ► Increased transcriptional levels of oxyA, oxyB and oxyC were observed. ► Phenotype changes and growth retardation were observed in mutants. ► Oxytetracycline production in the industrial strain mutant was improved. ► Transcriptional levels of a resistance gene otrB were upregulated in mutants.

Keywords
Minimal PKS genes; Overexpression; Morphology; Oxytetracycline
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Oxytetracycline biosynthesis improvement in Streptomyces rimosus following duplication of minimal PKS genes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Enzyme and Microbial Technology - Volume 50, Issues 6–7, 10 May 2012, Pages 318–324
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us