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Genomic variation in Streptococcus mutans: Deletions affecting the multiple pathways of β-glucoside metabolism

Lookup NU author(s): Lesley Old, Emeritus Professor Roy Russell

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Abstract

The genome of Streptococcus mutans UA159 contains two phospho-β- glucosidase genes, bglA and celA, which occur in operon-like arrangements along with genes for components of phosphotransferase transport systems and a third phospho-β-glucosidase encoded by the arb gene, which does not have its own associated transport system but relies on uptake by the bgl or cel systems. Targeted inactivation of each of the phospho-β-glucosidase genes revealed that bglA is involved in aesculin hydrolysis, celA is essential for utilisation of cellobiose, amygdalin, gentobiose and salicin, and arb is required for utilisation of arbutin. Inactivation of genes for the phosphotransferase systems revealed an overlap of specificity for transport of β-glucosides and also indicated that further, unidentified transport systems exist. The cel and arb genes are subject to catabolite repression by glucose, but the regM gene is not essential for catabolite repression. Screening a collection of isolates of S. mutans revealed strains with deletions affecting the msm, bgl and/or cel operons. The phenotypes of these strains could largely be explained on the basis of the results obtained from the knockout mutants of S. mutans UA159 but also indicated the existence of other pathways apparently absent from UA159. The extensive genetic and phenotypic variation found in β-glucoside metabolism indicates that there may be extensive heterogeneity in the species. © 2006 Blackwell Munksgaard.

Publication metadata

Author(s): Old LA, Lowes S, Russell RRB

Publication type: Article

Publication status: Published

Journal: Oral Microbiology and Immunology

Year: 2006

Volume: 21

Issue: 1

Pages: 21-27

ISSN (print): 0902-0055

ISSN (electronic): 2041-1014

Publisher: Wiley-Blackwell

URL: http://dx.doi.org/10.1111/j.1399-302X.2005.00246.x

DOI: 10.1111/j.1399-302X.2005.00246.x

PubMed id: 16390337

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