携带trpE26突变的枯草芽孢杆菌菌株与168菌株在遗传结构上的差异。
Differences in the genetic structure of Bacillus subitilis strains carrying the trpE26 mutation and strain 168.
作者信息
Trowsdale J, Anagnostopoulos C
出版信息
J Bacteriol. 1976 May;126(2):609-18. doi: 10.1128/jb.126.2.609-618.1976.
Abstract
It was previously shown that in strains of Bacillus subtilis bearing the trpE26 mutation a chromosome segment (from trpD to ilvA) is translocated to a position near the thr region. Further PBS1-mediated transduction data have now revealed that these strains also possess an inversion of part of the chromosome from the origin of replication, down to the tre locus on one side and the cysB locus on the other. These data concern evidence of linkage of tre-12- to markers in the translocation (hisH2, tyrA1, and metB3) as well as linkage of the cysB3 marker to thi-86, gly-133, and catA. They explain the previously observed absence of linkage of markers in the translocated segment to cysB3. The model proposed for the formation of merodiploids in trpE26 strains, which calls for the fusion of two genetic elements, is not incompatible with this new finding.
摘要
先前的研究表明，在携带trpE26突变的枯草芽孢杆菌菌株中，一个染色体片段（从trpD到ilvA）易位到了苏氨酸区域附近的一个位置。进一步的PBS1介导的转导数据现在显示，这些菌株还存在部分染色体的倒位，从复制起点开始，一侧延伸到tre位点，另一侧延伸到cysB位点。这些数据涉及tre-12与易位区域中的标记（hisH2、tyrA1和metB3）之间的连锁证据，以及cysB3标记与thi-86、gly-133和catA之间的连锁证据。它们解释了先前观察到的易位片段中的标记与cysB3之间缺乏连锁的现象。为trpE26菌株中部分二倍体形成提出的模型，该模型需要两个遗传元件的融合，与这一新发现并不矛盾。
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