Mutants of bacterium Azospirillum brasilense Sp245 with Omegon insertion in mmsB or fabG genes of lipid metabolism are defective in motility and flagellation

详细信息    查看全文

• 作者：E. A. Kovtunov (1)
  A. V. Shelud’ko (1)
  M. P. Chernyshova (1)
  L. P. Petrova (1)
  E. I. Katsy (1)
  
• 刊名：Russian Journal of Genetics
• 出版年：2013
• 出版时间：November 2013
• 年：2013
• 卷：49
• 期：11
• 页码：1107-1111
• 全文大小：
• 作者单位：E. A. Kovtunov (1)
  A. V. Shelud’ko (1)
  M. P. Chernyshova (1)
  L. P. Petrova (1)
  E. I. Katsy (1)
  
  1. Institute of Biochemistry and Physiology of Plants and Microorganisms, Russian Academy of Sciences, Saratov, 410049, Russia
  
• ISSN：1608-3369

文摘

Bacteria Azospirillum brasilense have mixed flagellation: in addition to the polar flagellum, numerous lateral flagella are formed on their cells on medium with increased density. Flagella determine the active swimming and swarming capacities of azospirilla. Using A. brasilense Sp245 as an example, it was shown that the Omegon-Km artificial transposon insertion into the chromosomal gene for 3-hydroxyisobutyrate dehydrogenase (mmsB) was concurrent with the appearance of significant defects in the formation of polar flagella and with the paralysis of lateral flagella. The Sp245 mutant with the Omegon insertion into the plasmid AZOBR-p1-borne gene for 3-oxoacyl-[acyl-carrier protein]-reductase (fabG) showed the complete loss of flagella and the swarming capacity, as well as significant defects in polar flagellar assembly (though some cells are still motile in liquid medium). The viability of the A. brasilense Sp245 mutants with the Omegon insertion into the mmsB or fabG gene was not reduced. No considerable differences in the fatty acid composition of whole cell lipid extracts were found for the A. brasilense Sp245 strain and its mmsB and fabG mutants.