BacA Is essential for bacteroid development in nodules of galegoid, but not phaseoloid, legumes

Karunakaran, R., Haag, A. F. , East, A. K., Ramachandran, V. K., Prell, J., James, E. K., Scocchi, M., Ferguson, G. P. and Poole, P. S. (2010) BacA Is essential for bacteroid development in nodules of galegoid, but not phaseoloid, legumes. Journal of Bacteriology, 192(11), pp. 2920-2928. (doi: 10.1128/JB.00020-10) (PMID:20363949) (PMCID:PMC2876491)

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Abstract

BacA is an integral membrane protein, the mutation of which leads to increased resistance to the antimicrobial peptides bleomycin and Bac71-35 and a greater sensitivity to SDS and vancomycin in Rhizobium leguminosarum bv. viciae, R. leguminosarum bv. phaseoli, and Rhizobium etli. The growth of Rhizobium strains on dicarboxylates as a sole carbon source was impaired in bacA mutants but was overcome by elevating the calcium level. While bacA mutants elicited indeterminate nodule formation on peas, which belong to the galegoid tribe of legumes, bacteria lysed after release from infection threads and mature bacteroids were not formed. Microarray analysis revealed almost no change in a bacA mutant of R. leguminosarum bv. viciae in free-living culture. In contrast, 45 genes were more-than 3-fold upregulated in a bacA mutant isolated from pea nodules. Almost half of these genes code for cell membrane components, suggesting that BacA is crucial to alterations that occur in the cell envelope during bacteroid development. In stark contrast, bacA mutants of R. leguminosarum bv. phaseoli and R. etli elicited the formation of normal determinate nodules on their bean host, which belongs to the phaseoloid tribe of legumes. Bacteroids from these nodules were indistinguishable from the wild type in morphology and nitrogen fixation. Thus, while bacA mutants of bacteria that infect galegoid or phaseoloid legumes have similar phenotypes in free-living culture, BacA is essential only for bacteroid development in indeterminate galegoid nodules.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Haag, Dr Andreas
Authors: Karunakaran, R., Haag, A. F., East, A. K., Ramachandran, V. K., Prell, J., James, E. K., Scocchi, M., Ferguson, G. P., and Poole, P. S.
College/School:College of Medical Veterinary and Life Sciences > School of Infection & Immunity
Journal Name:Journal of Bacteriology
Publisher:American Society for Microbiology
ISSN:0021-9193
ISSN (Online):1098-5530
Published Online:02 April 2010

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