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-Structure paper
タイトル | RhoG facilitates a conformational transition in the guanine nucleotide exchange factor complex DOCK5/ELMO1 to an open state. |
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ジャーナル・号・ページ | J Biol Chem, Vol. 300, Issue 7, Page 107459, Year 2024 |
掲載日 | 2024年6月8日 |
著者 | Mutsuko Kukimoto-Niino / Kazushige Katsura / Yoshiko Ishizuka-Katsura / Chiemi Mishima-Tsumagari / Mayumi Yonemochi / Mio Inoue / Reiko Nakagawa / Rahul Kaushik / Kam Y J Zhang / Mikako Shirouzu / |
PubMed 要旨 | The dedicator of cytokinesis (DOCK)/engulfment and cell motility (ELMO) complex serves as a guanine nucleotide exchange factor (GEF) for the GTPase Rac. RhoG, another GTPase, activates the ELMO-DOCK- ...The dedicator of cytokinesis (DOCK)/engulfment and cell motility (ELMO) complex serves as a guanine nucleotide exchange factor (GEF) for the GTPase Rac. RhoG, another GTPase, activates the ELMO-DOCK-Rac pathway during engulfment and migration. Recent cryo-EM structures of the DOCK2/ELMO1 and DOCK2/ELMO1/Rac1 complexes have identified closed and open conformations that are key to understanding the autoinhibition mechanism. Nevertheless, the structural details of RhoG-mediated activation of the DOCK/ELMO complex remain elusive. Herein, we present cryo-EM structures of DOCK5/ELMO1 alone and in complex with RhoG and Rac1. The DOCK5/ELMO1 structure exhibits a closed conformation similar to that of DOCK2/ELMO1, suggesting a shared regulatory mechanism of the autoinhibitory state across DOCK-A/B subfamilies (DOCK1-5). Conversely, the RhoG/DOCK5/ELMO1/Rac1 complex adopts an open conformation that differs from that of the DOCK2/ELMO1/Rac1 complex, with RhoG binding to both ELMO1 and DOCK5. The alignment of the DOCK5 phosphatidylinositol (3,4,5)-trisphosphate binding site with the RhoG C-terminal lipidation site suggests simultaneous binding of RhoG and DOCK5/ELMO1 to the plasma membrane. Structural comparison of the apo and RhoG-bound states revealed that RhoG facilitates a closed-to-open state conformational change of DOCK5/ELMO1. Biochemical and surface plasmon resonance (SPR) assays confirm that RhoG enhances the Rac GEF activity of DOCK5/ELMO1 and increases its binding affinity for Rac1. Further analysis of structural variability underscored the conformational flexibility of the DOCK5/ELMO1/Rac1 complex core, potentially facilitating the proximity of the DOCK5 GEF domain to the plasma membrane. These findings elucidate the structural mechanism underlying the RhoG-induced allosteric activation and membrane binding of the DOCK/ELMO complex. |
リンク | J Biol Chem / PubMed:38857861 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 4.23 - 4.91 Å |
構造データ | EMDB-36271, PDB-8jhk: EMDB-38466, PDB-8xm7: EMDB-60136, PDB-8zj2: EMDB-60146, PDB-8zji: EMDB-60147, PDB-8zjj: EMDB-60148, PDB-8zjk: EMDB-60149, PDB-8zjl: EMDB-60150, PDB-8zjm: |
化合物 | ChemComp-MG: ChemComp-GTP: |
由来 |
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キーワード | SIGNALING PROTEIN / ELMO / DOCK / GEF / GTPASE / RHO / RAC |