Earlier, such Azospirillum brasilense Sp245 mutants as flagellation-defective SK051, SK248 with paralyzed flagella, and BK570 swimming and swarming faster than Sp245 were obtained. In SK051 and SK248, the suicide vector pJFF350 integrated into the 18.3-kb XhoI fragment of an 85-MDa plasmid (p85) while in BK570, it integrated into the 9.1-kb XhoI-fragment of p85. In the present work, analysis of the nucleotide sequence of fusion products of p85 and pJFF350 was performed. In p85, in addition to three IS elements (two of which mediated cointegrate formation) and phage integrase gene, 22 open reading frames with coding properties were identified. Possible participation of predicted translation products of several p85 genes in determination of bacterial motility is discussed. Since differences in the primary structure of p85::pJFF350 cointegrates from SK051 and SK248 cells are localized within pJFF350 DNA, different effects of DNA-folding changes on the expression of corresponding p85 genes are suggested.
Russian Journal of Genetics – Springer Journals
Published: Jan 5, 2012
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