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Application of a double-reporter-guided mutant selection method to improve clavulanic acid production in Streptomyces clavuligerus

Paper ID Volume ID Publish Year Pages File Format Full-Text
31790 44838 2009 9 PDF Available
Title
Application of a double-reporter-guided mutant selection method to improve clavulanic acid production in Streptomyces clavuligerus
Abstract

A reporter-guided mutant selection (RGMS) method has been developed wherein reporters are used to facilitate selection of target over-expressing mutants. It was applied to improve clavulanic acid (CA) production in Streptomyces clavuligerus. In a single-reporter design, the transcriptional activator ccaR of CA biosynthesis was chosen as the over-expressing target, and neo (resistance to kanamycin) as the reporter; 51% of the selected mutants produced higher CA titer than the starting strain. To reduce the high false positive rate of single-reporter method, a double-reporter RGMS vector was configured, in which an xylE-neo double-reporter cassette was used to monitor ccaR expression; 90% of mutants selected by the modified method showed improvement in CA titer. Double-reporter RGMS is the most efficient tool for mutant selection reported to date and is also an alternative method for target over-expression. The mutants obtained by RGMS showed great genetic diversity that could be further exploited in inverse metabolic engineering.

Keywords
Strain improvement; Reporter; Metabolic engineering; Clavulanic acidCA, clavulanic acid; NTG, 1-methyl 3-nitro 1-nitrosoguanidine; PccaR, CcaR promoter; RGMS, reporter-guided mutant selection; HPLC, high-pressure liquid chromatography
First Page Preview
Application of a double-reporter-guided mutant selection method to improve clavulanic acid production in Streptomyces clavuligerus
Publisher
Database: Elsevier - ScienceDirect
Journal: Metabolic Engineering - Volume 11, Issues 4–5, July–September 2009, Pages 310–318
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering