Role of BacA in Lipopolysaccharide Synthesis, Peptide Transport, and Nodulation by Rhizobium sp Strain NGR234

被引:25
作者
Ardissone, Silvia [2 ]
Kobayashi, Hajime [1 ]
Kambara, Kumiko [2 ]
Rummel, Coralie [2 ]
Noel, K. Dale [3 ]
Walker, Graham C. [1 ]
Broughton, William J. [2 ]
Deakin, William J. [2 ]
机构
[1] MIT, Dept Biol, Cambridge, MA 02139 USA
[2] Univ Geneva, LBMPS, CH-1211 Geneva 4, Switzerland
[3] Marquette Univ, Dept Biol, Milwaukee, WI 53233 USA
基金
美国国家卫生研究院;
关键词
SINORHIZOBIUM-MELILOTI; LIPID-A; STRUCTURAL-CHARACTERIZATION; ACPXL MUTANT; GENETIC-ANALYSIS; ETLI CE3; PROTEIN; LEGUMINOSARUM; INFECTION; BACTERIA;
D O I
10.1128/JB.01260-10
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
BacA of Sinorhizobium meliloti plays an essential role in the establishment of nitrogen-fixing symbioses with Medicago plants, where it is involved in peptide import and in the addition of very-long-chain fatty acids (VLCFA) to lipid A of lipopolysaccharide (LPS). We investigated the role of BacA in Rhizobium species strain NGR234 by mutating the bacA gene. In the NGR234 bacA mutant, peptide import was impaired, but no effect on VLCFA addition was observed. More importantly, the symbiotic ability of the mutant was comparable to that of the wild type for a variety of legume species. Concurrently, an acpXL mutant of NGR234 was created and assayed. In rhizobia, AcpXL is a dedicated acyl carrier protein necessary for the addition of VLCFA to lipid A. LPS extracted from the NGR234 mutant lacked VLCFA, and this mutant was severely impaired in the ability to form functional nodules with the majority of legumes tested. Our work demonstrates the importance of VLCFA in the NGR234-legume symbiosis and also shows that the necessity of BacA for bacteroid differentiation is restricted to specific legume-Rhizobium interactions.
引用
收藏
页码:2218 / 2228
页数:11
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