Universität zu Köln

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:	Creators Email ORCID ORCID Put Code Seibold, Gerd M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Breitinger, Katrin J. UNSPECIFIED UNSPECIFIED UNSPECIFIED Kempkes, Raoul UNSPECIFIED UNSPECIFIED UNSPECIFIED Both, Leonard UNSPECIFIED UNSPECIFIED UNSPECIFIED Kraemer, Matthias UNSPECIFIED UNSPECIFIED UNSPECIFIED Dempf, Stefan UNSPECIFIED UNSPECIFIED UNSPECIFIED Eikmanns, Bernhard J. UNSPECIFIED UNSPECIFIED UNSPECIFIED
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:	Keywords Language ESCHERICHIA-COLI; BACTERIAL GLYCOGEN; GENE; BIOSYNTHESIS; METABOLISM; EXPRESSION; TREHALOSE; RAMA; SEQUENCE; PRODUCT Multiple languages Microbiology Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/48592