Seibold, Gerd M., Breitinger, Katrin J., Kempkes, Raoul, Both, Leonard, Kraemer, Matthias, Dempf, Stefan and Eikmanns, Bernhard J. (2011). The glgB-encoded glycogen branching enzyme is essential for glycogen accumulation in Corynebacterium glutamicum. Microbiology-(UK), 157. S. 3243 - 3252. LONDON: MICROBIOLOGY SOC. ISSN 1465-2080

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Abstract

Corynebacterium glutamicum transiently accumulates glycogen as carbon capacitor during the early exponential growth phase in media containing carbohydrates. In some bacteria glycogen is synthesized by the consecutive action of ADP-glucose pyrophosphorylase (GlgC), glycogen synthase (GlgA) and glycogen branching enzyme (GlgB). GlgC and GlgA of C. glutamicum have been shown to be necessary for glycogen accumulation in this organism. However, although cg1381 has been annotated as the putative C. glutamicum glgB gene, cg1381 and its gene product have not been characterized and their role in transient glycogen accumulation has not yet been investigated. We show here that the cg1381 gene product of C. glutamicum catalyses the formation of alpha-1,6-glycosidic bonds in polysaccharides and thus represents a glycogen branching enzyme. RT-PCR experiments revealed glgB to be co-transcribed with glgE, probably encoding a maltosyltransferase. Promoter activity assays with the glgE promoter region revealed carbon-source-dependent expression of the glgEB operon. Characterization of the growth and glycogen content of glgB-deficient and glgB-overexpressing strains showed that the glycogen branching enzyme GlgB is essential for glycogen formation in C. glutamicum. Taken together these results suggest that an interplay of the enzymes GlgC, GlgA and GlgB is not essential for growth, but is required for synthesis of the transient carbon capacitor glycogen in C. glutamicum.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Seibold, Gerd M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Breitinger, Katrin J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kempkes, RaoulUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Both, LeonardUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kraemer, MatthiasUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Dempf, StefanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Eikmanns, Bernhard J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-485927
DOI: 10.1099/mic.0.051565-0
Journal or Publication Title: Microbiology-(UK)
Volume: 157
Page Range: S. 3243 - 3252
Date: 2011
Publisher: MICROBIOLOGY SOC
Place of Publication: LONDON
ISSN: 1465-2080
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
ESCHERICHIA-COLI; BACTERIAL GLYCOGEN; GENE; BIOSYNTHESIS; METABOLISM; EXPRESSION; TREHALOSE; RAMA; SEQUENCE; PRODUCTMultiple languages
MicrobiologyMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/48592

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