Low Carbamoyl Phosphate Pools May Drive Lactobacillus plantarum CO(2)-Dependent Growth Phenotype. - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Molecular Microbiology and Biotechnology Année : 2008

Low Carbamoyl Phosphate Pools May Drive Lactobacillus plantarum CO(2)-Dependent Growth Phenotype.

Résumé

Lactobacillus plantarum is often found in nutrient-rich habitats with elevated levels of inorganic carbon (IC), and IC-dependent growth is commonly encountered in natural isolates of this species. High CO(2)-requiring (HCR) prototrophs are unable to grow under conditions of low IC unless arginine and pyrimidines are provided. Prototrophy is restored under high IC conditions, that is in 4% CO(2)-enriched air or bicarbonate-supplemented medium. Bicarbonate is required for the synthesis of carbamoyl phosphate (CP), a precursor of both arginine and pyrimidine biosynthesis. We hypothesize that at low IC levels, intracellular CP pools limit growth through the limitation of arginine and nucleotide supplies. HCR mutants obtained in the laboratory can be classified into 3 functional groups: mutants with impaired CP synthesis, increased CP consumption or increased CP requirements relative to wild type. This classification provides a framework for investigating the origin of the HCR phenotype in natural environmental isolates of Lactobacillus species, and to investigate the hypothesis that a low level of carbamoyl phosphate is a major determinant of the CO(2)-dependent growth phenotype often observed in L. plantarum isolates. Copyright (c) 2008 S. Karger AG, Basel.
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Dates et versions

hal-00185855 , version 1 (07-11-2007)

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Françoise Bringel, Stéphane Vuilleumier, Florence Arsène-Ploetze. Low Carbamoyl Phosphate Pools May Drive Lactobacillus plantarum CO(2)-Dependent Growth Phenotype.. Journal of Molecular Microbiology and Biotechnology, 2008, 14 (1-3), pp.22-30. ⟨10.1159/000107966⟩. ⟨hal-00185855⟩

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