Regulation of DNA damage response by trimeric G-proteins.

Regulation of DNA damage response by trimeric G-proteins.
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调节三聚体G蛋白的DNA损伤反应。

DOI:
10.1016/j.isci.2023.105973
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发表时间:
2023-02-17
期刊:
影响因子:
5.8
通讯作者:
Ghosh, Pradipta
Ghosh, Pradipta
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Abd El-Hafeez, Amer Ali;Sun, Nina;Chakraborty, Anirban;Ear, Jason;Roy, Suchismita;Chamarthi, Pranavi;Rajapakse, Navin;Das, Soumita;Luker, Kathryn E.;Hazra, Tapas K.;Luker, Gary D.;Ghosh, Pradipta

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真核细胞在检测到DNA双链断裂(DSB)后,通过两条相互竞争的途径之一死亡或修复DSB,即非同源末端连接(NHEJ)或同源重组(HR)。我们发现,双链断裂后细胞的命运取决于异源三聚体Giα·βγ蛋白的鸟嘌呤核苷酸交换调节剂GIV/GYDIN。GIV通过结合和隔离BRCA1抑制HR,BRCA1是HR途径中多个步骤的关键协调者,远离DSB;它还使用C-末端基序,通过磷酸依赖和非依赖机制结合BRCA1的S BRCT-模块。使用另一个非重叠的C-末端基序,GIV结合并激活GI,并增强“自由”的Gβγ→PI-3-激酶→AKT通路,该通路促进生存,并抑制HR,有利于NHEJ。缺乏GIV或其两个C-末端基序的丢失都会增加细胞在遗传毒性应激下的死亡。由于GIV选择性地结合其他含有BRCT的蛋白,这表明G蛋白可能在不同类型的DNA损伤后微调感知、修复和生存。非受体G蛋白调节剂,GIV/Girdin以规范和非规范模式与BRCA1结合GIV隔离BRCA1远离dsDNA断裂,抑制GIV对GI的HR激活增强Akt,抑制HR,有利于NHEJ生物科学;细胞生物学;分子生物学。
Upon sensing DNA double-strand breaks (DSBs), eukaryotic cells either die or repair DSBs via one of the two competing pathways, i.e., non-homologous end-joining (NHEJ) or homologous recombination (HR). We show that cell fate after DSBs hinges on GIV/Girdin, a guanine nucleotide-exchange modulator of heterotrimeric Giα•βγ protein. GIV suppresses HR by binding and sequestering BRCA1, a key coordinator of multiple steps within the HR pathway, away from DSBs; it does so using a C-terminal motif that binds BRCA1’s BRCT-modules via both phospho-dependent and -independent mechanisms. Using another non-overlapping C-terminal motif GIV binds and activates Gi and enhances the “free” Gβγ→PI-3-kinase→Akt pathway, which promotes survival and is known to suppress HR, favor NHEJ. Absence of GIV, or loss of either of its C-terminal motifs enhanced cell death upon genotoxic stress. Because GIV selectively binds other BRCT-containing proteins suggests that G-proteins may fine-tune sensing, repair, and survival after diverse types of DNA damage. Non-receptor G protein modulator, GIV/Girdin binds BRCA1 Binding occurs in both canonical and non-canonical modes GIV sequesters BRCA1 away from dsDNA breaks, suppresses HR Activation of Gi by GIV enhances Akt, suppresses HR, favors NHEJ Biological sciences; Cell biology; Molecular biology.
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