摘要
错配修复(mismatch repair,MMR)是生物体DNA复制后的一种常见修复系统,对于维持基因组稳定性至关重要,其关键步骤由MutS和MutL蛋白家族的成员执行,尽管这种修复途径十分重要,但在许多古菌和放线菌基因组中并不存在MutS或MutL的同源蛋白。这类细菌(例如分枝杆菌等)采用另一种非典型的MMR途径,由核酸内切酶EndoMS/NucS发挥关键作用,与典型MMR蛋白(MutS/MutL)相比没有结构同源性。EndoMS/NucS介导的非典型错配修复在分枝杆菌DNA修复、突变和同源重组以及抗生素耐药等方面发挥重要作用。本文通过对比典型MMR途径和非典型MMR途径,深入阐述了分枝杆菌EndoMS/NucS介导的非典型MMR途径及其最新进展,以期为分枝杆菌错配修复分子机制带来新见解以及对分枝杆菌抗生素治疗提供研究线索。
Mismatch repair(MMR)is a common repair system after DNA replication,which is critical for maintaining genomic stability.Members of the MutS and MutL protein families are involved in key steps of mismatch repair.Despite the major importance of this repair pathway,MutS–MutL are absent in almost all Actinobacteria and many Archaea.Mycobacteria and others have another non-canonical MMR pathway,in which EndoMS/NucS plays a key role and has no structural homology compared to canonical MMR proteins(MutS/MutL).EndoMS/NucS mediated non-canonical mismatch repair plays an important role in DNA repair,mutation,homologous recombination and antibiotic resistance of Mycobacterium.By comparing the classical and non-canonical MMR pathways,this paper reviews the EndoMS/NucS-mediated non-canonical MMR pathway in Mycobacterium and its recent progress.We hope to bring new insights into the molecular mechanism of mycobacterial mismatch repair as well as to provide new research clues for mycobacterial antibiotic therapy.
作者
向莎莎
谢建平
Shasha Xiang;Jianping Xie(Institute of Modern Biopharmaceuticals,School of Life Sciences,Southwest University,Chongqing 400715,China)
出处
《遗传》
CAS
CSCD
北大核心
2023年第11期1018-1027,共10页
Hereditas（Beijing)
基金
国家自然科学基金项目(编号:82072246)资助。
