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Molecular characterization of PrpR, the transcriptional activator of propionate catabolism in Corynebacterium glutamicum

Paper ID Volume ID Publish Year Pages File Format Full-Text
23684 43463 2012 11 PDF Available
Title
Molecular characterization of PrpR, the transcriptional activator of propionate catabolism in Corynebacterium glutamicum
Abstract

The 2-methylcitrate cycle is used to metabolize propionate in Corynebacterium glutamicum. The regulator, PrpR (Cg0800), of the prpDBC2 operon was identified and characterized. The regulator has no similarities to the up to now known PrpR regulators from other organisms. Growth of a ΔprpR mutant revealed severe growth deficits and a prolonged lag phase if propionate was present in the medium. Transcriptome analyses demonstrated the inability of the ΔprpR strain to induce the prpDBC2 genes in the presence of propionate indicating that PrpR represents a transcriptional activator. They also provided evidence that PrpR controls only the prpDBC2 operon while transcription of the prpR gene was found to be independent of the used carbon source. GC–MS based metabolic profiling of the wild type and the ΔprpR strain grown with propionate revealed smaller pool sizes of the metabolites of the 2-methylcitrate cycle in the mutant strain. The transcriptional start sites and their putative promoters of the prpDBC2 operon and the prpR gene were identified by RACE-PCR. Analyses of promoter test vector constructs led to the identification of a 121 bp operator region upstream of prpDBC2, which is essential for a propionate-induced transcription by PrpR. Finally, EMSA studies revealed that 2-methylcitrate most probably acts as co-activator of PrpR.

► We have characterized the transcriptional regulation of propionate catabolism fort he first time in a Gram-positive bacterium. ► The regulator PrpR is one of the few characterized examples of the bacterial HTH_XRE regulator family. ► PrpR has potential to be applied in expression systems for the industrially important bacterium Corynebacterium glutamicum.

Keywords
Corynebacterium glutamicum; Transcriptional regulation; Carbon source; Propionate
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Molecular characterization of PrpR, the transcriptional activator of propionate catabolism in Corynebacterium glutamicum
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 159, Issues 1–2, 31 May 2012, Pages 1–11
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