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Deciphering the essentiality and function of SxSx motif in Mycobacterium tuberculosis UvrB.
Biochimie ( IF 3.3 ) Pub Date : 2020-01-08 , DOI: 10.1016/j.biochi.2020.01.003
Manoj Thakur 1 , K Muniyappa 1
Affiliation  

The UvrB subunit is a central component of the UvrABC incision complex and plays a pivotal role in damage recognition, strand excision and repair synthesis. A conserved structural motif (the SxSx motif) present in UvrB is analogous to a similar motif (TxGx) in the helicases of superfamily 2, whose function is not fully understood. To elucidate the significance of the SxSx (Ser143-Val144-Ser145-Cys146) motif in Mycobacterium tuberculosis UvrB (MtUvrB), different variants of MtUvrB subunit were constructed and characterized. The SxSx motif indeed was found to be essential for MtUvrB function: while Ser143 and Cys146 residues within this motif were crucial for MtUvrB function, Ser145 plays an important but less essential role. The SxSx motif-deleted mutant was drastically attenuated and three single (S143A, S145A and C146A) mutants and a double (S143A/S145A) mutant exhibited various degrees of severity in their DNA-binding, DNA helicase and ATPase activities. Taken together, these results highlight a hitherto unrecognized role for SxSx motif in the catalytic activities of UvrB.

中文翻译:

解读结核分枝杆菌UvrB中SxSx主题的必要性和功能。

UvrB亚基是UvrABC切口复合体的重要组成部分,在损伤识别,链切除和修复合成中起着关键作用。UvrB中存在的保守结构基序(SxSx基序)类似于超家族2的解旋酶中类似的基序(TxGx),其功能尚不完全清楚。为了阐明结核分枝杆菌UvrB(MtUvrB)中SxSx(Ser143-Val144-Ser145-Cys146)主题的重要性,构建并表征了MtUvrB亚基的不同变体。确实发现SxSx基序对于MtUvrB功能必不可少:虽然此基序中的Ser143和Cys146残基对MtUvrB功能至关重要,但Ser145却起着重要但不太重要的作用。删除了SxSx基序缺失的突变体,并且三个突变体(S143A,S145A和C146A)突变体和双(S143A / S145A)突变体在其DNA结合,DNA解旋酶和ATPase活性方面表现出不同程度的严重性。综上所述,这些结果突出了SxSx基序在UvrB的催化活性中迄今尚未被认识的作用。
更新日期:2020-01-08
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