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-Structure paper
| タイトル | The GTPase κB-Ras is an essential subunit of the RalGAP tumor suppressor complex. |
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| ジャーナル・号・ページ | J Biol Chem, Vol. 301, Issue 8, Page 110460, Year 2025 |
| 掲載日 | 2025年7月5日 |
著者 | René Rasche / Lisa Helene Apken / Sonja Titze / Esther Michalke / Rohit Kumar Singh / Andrea Oeckinghaus / Daniel Kümmel / ![]() |
| PubMed 要旨 | κB-Ras1 and κB-Ras2 are small GTPases with noncanonical features that act as tumor suppressors downstream of Ras. Via interaction with the RalGAP (GTPase-activating protein) complex, they limit ...κB-Ras1 and κB-Ras2 are small GTPases with noncanonical features that act as tumor suppressors downstream of Ras. Via interaction with the RalGAP (GTPase-activating protein) complex, they limit activity of Ral GTPases and restrict anchorage-independent proliferation. We here present the crystal structure of κB-Ras1 in complex with the N-terminal domain of RGα2. The structure suggests a mechanism of intrinsic GTP hydrolysis of κB-Ras1 that relies on a scaffolding function of the GTPase rather than on catalytic residues, which we confirm by mutational analysis. The interaction with RGα2 is nucleotide independent and does not involve κB-Ras1 switch regions, which establishes κB-Ras proteins as a constitutive third subunit of RalGAP complexes. Functional studies demonstrate that κB-Ras proteins are not required for RalGAP catalytic activity in vitro but for functionality in vivo. We propose that κB-Ras may thus act as a regulator of RalGAP localization and thereby control the Ras-Ral signaling pathway. |
リンク | J Biol Chem / PubMed:40619001 / PubMed Central |
| 手法 | EM (単粒子) / X線回折 |
| 解像度 | 2.72 - 4.35 Å |
| 構造データ | ![]() EMDB-53418: Consensus cryo EM map of the human RalGAP2 complex ![]() EMDB-53419: Focussed cryo EM map from multibody refinement of human RalGAP2 complex (body1: alpha2 beta heterodimer interface) ![]() EMDB-53420: Focussed cryo EM map from multibody refinement of human RalGAP2 complex (body2: alpha2 N-terminus) ![]() EMDB-53421: Focussed cryo EM map from multibody refinement of human RalGAP2 complex (body3: beta-beta homodimer interface) EMDB-53422, PDB-9qwp: ![]() PDB-9qu1: |
| 化合物 | ![]() ChemComp-GNP: ![]() ChemComp-MG: ![]() ChemComp-HOH: |
| 由来 |
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キーワード | SIGNALING PROTEIN / RAL / GTPase / RalGAP / kB-Ras / Complex / GTPase activating protein / Asn thumb GAP |
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