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RASSF effectors couple diverse RAS subfamily GTPases to the Hippo pathway
Science Signaling ( IF 7.3 ) Pub Date : 2020-10-13 , DOI: 10.1126/scisignal.abb4778
Thillaivillalan Dhanaraman 1 , Swati Singh 1 , Ryan C Killoran 1 , Anamika Singh 2 , Xingjian Xu 1 , Julia M Shifman 2 , Matthew J Smith 1, 3
Affiliation  

Small guanosine triphosphatases (GTPases) of the RAS superfamily signal by directly binding to multiple downstream effector proteins. Effectors are defined by a folded RAS-association (RA) domain that binds exclusively to GTP-loaded (activated) RAS, but the binding specificities of most RA domains toward more than 160 RAS superfamily GTPases have not been characterized. Ten RA domain family (RASSF) proteins comprise the largest group of related effectors and are proposed to couple RAS to the proapoptotic Hippo pathway. Here, we showed that RASSF1-6 formed complexes with the Hippo kinase ortholog MST1, whereas RASSF7-10 formed oligomers with the p53-regulating effectors ASPP1 and ASPP2. Moreover, only RASSF5 bound directly to activated HRAS and KRAS, and RASSFs did not augment apoptotic induction downstream of RAS oncoproteins. Structural modeling revealed that expansion of the RASSF effector family in vertebrates included amino acid substitutions to key residues that direct GTPase-binding specificity. We demonstrated that the tumor suppressor RASSF1A formed complexes with the RAS-related GTPases GEM, REM1, REM2, and the enigmatic RASL12. Furthermore, interactions between RASSFs and RAS GTPases blocked YAP1 nuclear localization. Thus, these simple scaffolds link the activation of diverse RAS family small G proteins to Hippo or p53 regulation.



中文翻译:

RASSF 效应器将不同的 RAS 亚家族 GTPases 与 Hippo 通路结合

RAS 超家族的小鸟苷三磷酸酶 (GTPase) 通过直接与多个下游效应蛋白结合来发出信号。效应子由折叠的 RAS 关联 (RA) 域定义,该域仅与加载 GTP 的(激活的)RAS 结合,但大多数 RA 域对 160 多个 RAS 超家族 GTPase 的结合特异性尚未表征。10 个 RA 域家族 (RASSF) 蛋白包含最大的一组相关效应子,并被提议将 RAS 与促凋亡 Hippo 途径结合起来。在这里,我们发现 RASSF1-6 与 Hippo 激酶直系同源物 MST1 形成复合物,而 RASSF7-10 与 p53 调节效应物 ASPP1 和 ASPP2 形成寡聚体。此外,只有 RASSF5 ​​直接与激活的 HRAS 和 KRAS 结合,并且 RASSFs 没有增强 RAS 癌蛋白下游的凋亡诱导。结构模型显示,脊椎动物中 RASSF 效应子家族的扩展包括将氨基酸替换为指导 GTPase 结合特异性的关键残基。我们证明了肿瘤抑制因子 RASSF1A 与 RAS 相关 GTPases GEM、REM1、REM2 和神秘的 RASL12 形成复合物。此外,RASSFs 和 RAS GTPases 之间的相互作用阻止了 YAP1 核定位。因此,这些简单的支架将多种 RAS 家族小 G 蛋白的激活与 Hippo 或 p53 调节联系起来。RASSFs 和 RAS GTPases 之间的相互作用阻止了 YAP1 核定位。因此,这些简单的支架将多种 RAS 家族小 G 蛋白的激活与 Hippo 或 p53 调节联系起来。RASSFs 和 RAS GTPases 之间的相互作用阻止了 YAP1 核定位。因此,这些简单的支架将多种 RAS 家族小 G 蛋白的激活与 Hippo 或 p53 调节联系起来。

更新日期:2020-10-13
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