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Applied and Environmental Microbiology, May 2003, p. 2674-2683, Vol. 69, No. 5
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.5.2674-2683.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Extent of Genetic Lesions of the Arginine and Pyrimidine Biosynthetic Pathways in Lactobacillus plantarum, L. paraplantarum, L. pentosus, and L. casei: Prevalence of CO2-Dependent Auxotrophs and Characterization of Deficient arg Genes in L. plantarum

Françoise Bringel* and Jean-Claude Hubert

Laboratoire de Dynamique, Expression et Évolution des génomes de micro-organismes, FRE 2326 Université Louis-Pasteur/CNRS, 67000 Strasbourg, France

Received 26 September 2002/ Accepted 30 January 2003

Lactic acid bacteria require rich media since, due to mutations in their biosynthetic genes, they are unable to synthesize numerous amino acids and nucleobases. Arginine biosynthesis and pyrimidine biosynthesis have a common intermediate, carbamoyl phosphate (CP), whose synthesis requires CO2. We investigated the extent of genetic lesions in both the arginine biosynthesis and pyrimidine biosynthesis pathways in a collection of lactobacilli, including 150 strains of Lactobacillus plantarum, 32 strains of L. pentosus, 15 strains of L. paraplantarum, and 10 strains of L. casei. The distribution of prototroph and auxotroph phenotypes varied between species. All L. casei strains, no L. paraplantarum strains, two L. pentosus strains, and seven L. plantarum strains required arginine for growth. Arginine auxotrophs were more frequently found in L. plantarum isolated from milk products than in L. plantarum isolated from fermented plant products or humans; association with dairy products might favor arginine auxotrophy. In L. plantarum the argCJBDF genes were functional in most strains, and when they were inactive, only one gene was mutated in more than one-half of the arginine auxotrophs. Random mutation may have generated these auxotrophs since different arg genes were inactivated (there were single point mutations in three auxotrophs and nonrevertible genetic lesions in four auxotrophs). These data support the hypothesis that lactic acid bacteria evolve by progressively loosing unnecessary genes upon adaptation to specific habitats, with genome evolution towards cumulative DNA degeneration. Although auxotrophy for only uracil was found in one L. pentosus strain, a high CO2 requirement (HCR) for arginine and pyrimidine was common; it was found in 74 of 207 Lactobacillus strains tested. These HCR auxotrophs may have had their CP cellular pool-related genes altered or deregulated.

* Corresponding author. Mailing address: Laboratoire de Dynamique, Expression et Évolution des génomes de micro-organismes, FRE 2326 Université Louis-Pasteur/CNRS, 28 rue Goethe, 67083 Strasbourg, France. Phone: 33 3 90 24 18 15. Fax: 33 3 90 24 20 28. E-mail address: bringel{at}gem.u-strasbg.fr.

Applied and Environmental Microbiology, May 2003, p. 2674-2683, Vol. 69, No. 5
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.5.2674-2683.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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