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首页> 外文期刊>Applied and Environmental Microbiology >Isolation of behavioral mutants of Azospirillum brasilense by using Tn5 lacZ.
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Isolation of behavioral mutants of Azospirillum brasilense by using Tn5 lacZ.

机译:通过使用Tn5 lacZ分离巴西拟螺旋体的行为突变体。

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Tn5 lacZ mutants were generated with Azospirillum brasilense 7030 by mating that strain with Escherichia coli strains carrying suicide plasmid pCIB100 or pCIB110. Kanamycin-resistant Azospirillum colonies were obtained with a maximum frequency of 10(-6) per recipient cell. The potential of Tn5 lacZ for random transposon mutagenesis coupled to transcription analysis in A. brasilense 7030 was demonstrated. Sixty percent of all Kmr A. brasilense 7030 mutants expressed beta-galactosidase activity. Mutants affected in motility (Fla-) and general chemotaxis (Che-) were identified. Chromosomal insertions of Tn5 lacZ are involved, except for two Che- mutants. The latter che loci reside on a 90-megadalton plasmid. Expression of an acidic protein (Mr, 110,000) was abolished in these mutants.
机译:通过使该菌株与携带自杀质粒pCIB100或pCIB110的大肠杆菌菌株交配,用巴西固氮螺菌7030生成Tn5 lacZ突变体。获得卡那霉素抗性螺旋藻菌落,每个受体细胞的最大频率为10(-6)。证明了Tn5 lacZ用于随机转座子诱变和巴西拟南芥7030转录分析的潜力。所有的Kmr brasilense 7030突变体中有60%表达了β-半乳糖苷酶活性。鉴定了受运动性(Fla-)和一般趋化性(Che-)影响的突变体。 Tn5 lacZ的染色体插入涉及,除了两个Che突变体。后一个基因座位于一个90兆道尔顿的质粒上。在这些突变体中消除了酸性蛋白(Mr,110,000)的表达。

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