Mutation spectrum in Escherichia coli DNA mismatch repair deficient (mutH) strain.

Mutation spectrum in Escherichia coli DNA mismatch repair deficient (mutH) strain.
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大肠杆菌 DNA 错配修复缺陷 (mutH) 菌株的突变谱。

DOI:
10.1093/nar/15.20.8205
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发表时间:
1987
影响因子:
14.9
通讯作者:
Marinus,MG
Marinus,MG
中科院分区:
生物学2区
文献类型:
--
作者:
Rewinski,C;Marinus,MG

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大肠杆菌的dam定向复制后错配修复系统可从DNA中去除碱基对错配。它们的产物,如mutLandmutSgenes等,是有效的错配修复所必需的。这些基因产物的缺失会导致DNA错配的持续存在,从而导致自发突变率的增加。为了确定错配修复系统在体内的特异性,我们从质粒携带的mnt抑制基因的amuth菌株中分离并鉴定了47个独立突变。主要的突变类型包括发生在mnt基因中仅有的两个5‘-GATC-3’序列的6个碱基对内的AT到GC的转变。在野生型对照菌株中,ISl元件的插入是主要的自发突变事件。证实了dam定向错配修复模型的预测,即dam和mutH菌株的突变谱应该是相同的。
The Dam-directed post-replicatve mismatch repair system ofEscherichia coliremoves base pair mismatches from DNA. The products of themutH,mutLandmutSgenes, among others, are required for efficient mismatch repair. Absence of any of these gene products leads to persistence of mismatches in DNA with a resultant increase in spontaneous mutation rate. To determine the specificity of the mismatch repair system in vivo we have isolated and characterized 47 independent mutations from amutHstrain in the plasmid borne mnt repressor gene. The major class of mutations comprises AT to GC transitions that occur within six base pairs of the only two 5'-GATC-3' sequences in the mnt gene. In the wild type control strain, insertion of the ISl element was the major spontaneous mutational event. A prediction of the Dam-directed mismatch repair model, that the mutation spectra of dam and mutH strains should be the same, was confirmed.
DOI: 10.1016/b978-0-12-456270-7.x5001-2
发表时间: 1988
期刊: Immunology today
影响因子: --
作者:
K. Low
通讯作者: K. Low
快速、轻松地对大型线性双链 DNA 和超螺旋质粒 DNA 进行测序
DOI: --
发表时间: 1985
期刊:
影响因子: --
作者:
R. Zagursky;K. Baumeister;N. Lomax;M. Berman
通讯作者: M. Berman