14-3-3 proteins, FHA domains and BRCT domains in the DNA damage response.

14-3-3 proteins, FHA domains and BRCT domains in the DNA damage response.
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DOI:
10.1016/j.dnarep.2009.04.004
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发表时间:
2009-09-02
期刊:
影响因子:
3.8
通讯作者:
Yaffe MB
Yaffe MB
中科院分区:
医学3区
文献类型:
--
作者:
Mohammad DH;Yaffe MB

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DNA损伤反应依赖于蛋白丝氨酸/苏氨酸激酶和模块化磷酸丝氨酸/苏氨酸结合域的协同活动,以传递损伤信号并招募修复蛋白。PIKK蛋白激酶家族,包括ATM/ATR/DNA-PK,优先磷酸化Ser-Gln位点,而它们的亲碱性下游效应激酶Chk1/Chk2/MK2优先磷酸化疏水的x - arg - x - x - ser / thr -疏水位点。串联BRCT结构域的一个子集作为磷酸化肽结合模块,在DNA损伤后与ATM/ATR/DNA- pk底物结合。相反,14-3-3蛋白与Chk1/Chk2/MK2底物相互作用。FHA结构域已被证明与ATM/ATR/DNA-PK和CK2底物相互作用。在这篇综述中,我们考虑了底物磷酸化如何与BRCT结构域、FHA结构域和14-3-3蛋白一起调节电离辐射诱导的核病灶,并帮助建立G2/M检查点。我们讨论了MDC1的作用,MDC1是一种分子支架,通过不同的磷酸化相互作用,招募早期蛋白到病灶,如NBS1和RNF8。此外,我们考虑14-3-3蛋白和Chk2 FHA结构域在启动和维持细胞周期阻滞中的作用。
The DNA damage response depends on the concerted activity of protein serine/threonine kinases and modular phosphoserine/threonine binding domains to relay the damage signal and recruit repair proteins. The PIKK family of protein kinases, which includes ATM/ATR/DNA-PK, preferentially phosphorylate Ser-Gln sites, while their basophilic downstream effecter kinases, Chk1/Chk2/MK2 preferentially phosphorylate hydrophobic-X-Arg-X-X-Ser/Thr-hydrophobic sites. A subset of tandem BRCT domains act as phosphopeptide binding modules that bind to ATM/ATR/DNA-PK substrates after DNA damage. Conversely, 14-3-3 proteins interact with substrates of Chk1/Chk2/MK2. FHA domains have been shown to interact with substrates of ATM/ATR/DNA-PK and CK2. In this review we consider how substrate phsophorylation together with BRCT domains, FHA domains and 14-3-3 proteins function to regulate ionizing radiation-induced nuclear foci and help to establish the G2/M checkpoint. We discuss the role of MDC1 a molecular scaffold that recruits early proteins to foci, such as NBS1 and RNF8, through distinct phosphodependent interactions. In addition, we consider the role of 14-3-3 proteins and the Chk2 FHA domain in initiating and maintaining cell cycle arrest.
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