fulltext.study @t Gmail

The impact of PHB accumulation on l-glutamate production by recombinant Corynebacterium glutamicum

Paper ID Volume ID Publish Year Pages File Format Full-Text
24899 43544 2007 7 PDF Available
Title
The impact of PHB accumulation on l-glutamate production by recombinant Corynebacterium glutamicum
Abstract

Corynebacterium glutamicum, a gram-positive soil bacterium, has been used extensively for the industrial production of l-glutamate and other amino acids. In this study, an Escherichia coli–C. glutamicum shuttle expression plasmid harboring polyhydroxybutyrate (PHB) synthesis genes, phbCAB from Ralstonia eutropha, was constructed under the Ptrc promoter. C. glutamicum harboring this plasmid accumulated 3–13% PHB with a weight average molecular mass of 125,400 and a polydispersity of 11.3 when grown on glucose. PHB synthesis related enzyme activities including β-ketothiolase (PhbA), acetoacetyl-CoA reductase (PhbB) and PHB synthase (PhbC) were found to be constitutively produced independent of IPTG. l-Glutamate production increased 39–68% in two C. glutamicum strains harboring PHB synthesis genes compared with their parent strains in shake flask experiments. In fermentor studies, the recombinant produced approximately 23% more l-glutamate compared with that of the wild type, and yielded less intermediate metabolites or by-products including α-ketoglutarate, l-glutamine and lactate. These results suggested that the expression of phbCAB genes in C. glutamicum could help regulate glutamate production metabolism. This demonstrated that the expression of PHB synthesis genes has a positive effect on l-glutamate production in C. glutamicum.

Keywords
Corynebacterium glutamicum; l-glutamate; PHB; Polyhydroxybutyrate; Lactate
First Page Preview
The impact of PHB accumulation on l-glutamate production by recombinant Corynebacterium glutamicum
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
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Biotechnology - Volume 132, Issue 3, 1 November 2007, Pages 273–279
Authors
, , , ,
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