Title
Identification of a gene cluster for the biosynthesis of a long, galactose-rich exopolysaccharide in **Lactobacillus rhamnosus** GG and functional analysis of the priming glycosyltransferase Identification of a gene cluster for the biosynthesis of a long, galactose-rich exopolysaccharide in **Lactobacillus rhamnosus** GG and functional analysis of the priming glycosyltransferase
Author
Faculty/Department
Faculty of Sciences. Bioscience Engineering
Publication type
article
Publication
Baltimore, Md ,
Subject
Biology
Human medicine
Engineering sciences. Technology
Source (journal)
Applied and environmental microbiology. - Baltimore, Md
Volume/pages
75(2009) :11 , p. 3554-3563
ISSN
0099-2240
ISI
000266345800021
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Cell surface polysaccharides have an established role as virulence factors in human bacterial pathogens. Less documented are the biosynthesis and biological functions of surface polysaccharides in beneficial bacteria. We identified a gene cluster that encodes the enzymes and regulatory and transporter proteins for the different steps in the biosynthesis of extracellular polysaccharides (EPS) of the well-documented probiotic strain Lactobacillus rhamnosus GG. Subsequent mutation of the welE gene, encoding the priming glycosyltransferase within this cluster, and comparative phenotypic analyses of wild-type versus mutant strains confirmed the specific function of this gene cluster in the biosynthesis of high-molecular-weight, galactose-rich heteropolymeric EPS molecules. The phenotypic analyses included monomer composition determination, estimation of the polymer length of the isolated EPS molecules, and single-molecule force spectroscopy of the surface polysaccharides. Further characterization of the welE mutant also showed that deprivation of these long, galactose-rich EPS molecules results in an increased adherence and biofilm formation capacity of L. rhamnosus GG, possibly because of less shielding of adhesins such as fimbria-like structures.
E-info
https://repository.uantwerpen.be/docman/iruaauth/9ebf96/6ba7be32b51.pdf
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