- EMDB-63249: Cryo-EM structure of human MON1A-CCZ1-RAB7A -
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基本情報
登録情報
データベース: EMDB / ID: EMD-63249
タイトル
Cryo-EM structure of human MON1A-CCZ1-RAB7A
マップデータ
試料
複合体: Cryo-EM structure of human MON1A-CCZ1-RAB7A
複合体: Ternary complex vacuolar fusion protein CCZ1 homolog with MON1A and RAB7A
タンパク質・ペプチド: Vacuolar fusion protein CCZ1 homolog B
複合体: Ternary complex of vacuolar fusion protein MON1 homolog A with CCZ1 and RAB7A
タンパク質・ペプチド: Vacuolar fusion protein MON1 homolog A
複合体: Ternary complex of Ras-related protein Rab-7a with Vacuolar fusion protein CCZ1 and MON1A
タンパク質・ペプチド: Ras-related protein Rab-7a
キーワード
Complex / GEF / RAB-GTPase / PROTEIN TRANSPORT
機能・相同性
機能・相同性情報
Mon1-Ccz1 complex / synaptic vesicle recycling via endosome / lipophagy / positive regulation of viral process / phagosome acidification / protein to membrane docking / neurotransmitter receptor transport, postsynaptic endosome to lysosome / epidermal growth factor catabolic process / alveolar lamellar body / negative regulation of intralumenal vesicle formation ...Mon1-Ccz1 complex / synaptic vesicle recycling via endosome / lipophagy / positive regulation of viral process / phagosome acidification / protein to membrane docking / neurotransmitter receptor transport, postsynaptic endosome to lysosome / epidermal growth factor catabolic process / alveolar lamellar body / negative regulation of intralumenal vesicle formation / Suppression of autophagy / phagosome-lysosome fusion / negative regulation of exosomal secretion / establishment of vesicle localization / retromer complex binding / phagosome maturation / presynaptic endosome / protein localization to lysosome / endosome to plasma membrane protein transport / early endosome to late endosome transport / phagophore assembly site membrane / positive regulation of exosomal secretion / protein targeting to vacuole / RAB geranylgeranylation / protein targeting to lysosome / melanosome membrane / RAB GEFs exchange GTP for GDP on RABs / RHOD GTPase cycle / RHOF GTPase cycle / retrograde transport, endosome to Golgi / TBC/RABGAPs / endosome to lysosome transport / RHOJ GTPase cycle / RHOQ GTPase cycle / CDC42 GTPase cycle / autophagosome membrane / viral release from host cell / protein secretion / RHOH GTPase cycle / RHOG GTPase cycle / autophagosome assembly / RAC2 GTPase cycle / RAC3 GTPase cycle / bone resorption / intracellular transport / lipid catabolic process / vesicle-mediated transport / phagocytic vesicle / lipid droplet / RAC1 GTPase cycle / Prevention of phagosomal-lysosomal fusion / MHC class II antigen presentation / secretory granule membrane / guanyl-nucleotide exchange factor activity / small monomeric GTPase / response to bacterium / small GTPase binding / mitochondrial membrane / phagocytic vesicle membrane / endocytosis / positive regulation of protein catabolic process / GDP binding / synaptic vesicle membrane / late endosome membrane / late endosome / protein transport / G protein activity / lysosome / endosome membrane / lysosomal membrane / intracellular membrane-bounded organelle / GTPase activity / Neutrophil degranulation / GTP binding / glutamatergic synapse / Golgi apparatus / mitochondrion / extracellular exosome / plasma membrane / cytosol 類似検索 - 分子機能
Vacuolar fusion protein Ccz1 / Vacuolar fusion protein Mon1 / CCZ1/INTU, second Longin domain / CCZ1/INTU/HPS4, third Longin domain / Intu longin-like domain 2 / Intu longin-like domain 3 / CCZ1/INTU/HSP4, first Longin domain / First Longin domain of INTU, CCZ1 and HPS4 / FUZ/MON1/HPS1, third Longin domain / FUZ/MON1/HPS1, second Longin domain ...Vacuolar fusion protein Ccz1 / Vacuolar fusion protein Mon1 / CCZ1/INTU, second Longin domain / CCZ1/INTU/HPS4, third Longin domain / Intu longin-like domain 2 / Intu longin-like domain 3 / CCZ1/INTU/HSP4, first Longin domain / First Longin domain of INTU, CCZ1 and HPS4 / FUZ/MON1/HPS1, third Longin domain / FUZ/MON1/HPS1, second Longin domain / FUZ/MON1/HPS1, first Longin domain / First Longin domain of FUZ, MON1 and HPS1 / Second Longin domain of FUZ, MON1 and HPS1 / Third Longin domain of FUZ, MON1 and HPS1 / Small GTPase Rab domain profile. / Ran (Ras-related nuclear proteins) /TC4 subfamily of small GTPases / Rho (Ras homology) subfamily of Ras-like small GTPases / Ras subfamily of RAS small GTPases / Small GTPase / Ras family / Rab subfamily of small GTPases / Small GTP-binding protein domain / P-loop containing nucleoside triphosphate hydrolase 類似検索 - ドメイン・相同性
Ras-related protein Rab-7a / Vacuolar fusion protein CCZ1 homolog B / Vacuolar fusion protein MON1 homolog A 類似検索 - 構成要素
ジャーナル: Life Metab / 年: 2025 タイトル: Cryo-EM structure of the human MON1A-CCZ1-RAB7A complex provides insights into nucleotide exchange mechanism. 著者: Xinna Li / Dan Li / Dan Tang / Xiaofang Huang / Hui Bao / Jiawei Wang / Shiqian Qi / 要旨: Autophagy is a fundamental cellular process, conserved across species from yeast to mammals, that plays a crucial role in maintaining cellular homeostasis. The functionally conserved MON1-CCZ1 (MC1) ...Autophagy is a fundamental cellular process, conserved across species from yeast to mammals, that plays a crucial role in maintaining cellular homeostasis. The functionally conserved MON1-CCZ1 (MC1) complex serves as a guanine nucleotide exchange factor (GEF) for the RAB GTPase RAB7A and is indispensable for directing RAB7A recruitment to autophagosome or lysosomal membranes. Despite its critical role, the precise molecular mechanism underlying the assembly of the human MON1A-CCZ1 (HsMC1) complex and its specific GEF activity towards RAB7A has remained unclear. In this study, we report the high-resolution cryo-electron microscopy (cryo-EM) structure of the HsMC1 GEF domain in a complex with the nucleotide-free RAB7A at 2.85 Å resolution. Our structural data demonstrate that engagement with the HsMC1 complex induces marked conformational shifts in the phosphate-binding loop (P-loop) and Switch I/II regions of RAB7A. A striking feature of this complex is the direct interaction between the P-loop of RAB7A and CCZ1, a structural detail not previously observed. Furthermore, biochemical assays targeting residues within Interface I or II of the HsMC1-RAB7A complex highlight their critical role in mediating the interaction and suggest a unique mechanism for nucleotide exchange facilitated by the HsMC1 complex. These findings provide novel molecular insights into the functional mechanisms of the HsMC1-RAB7A complex, offering a robust structural framework to inform future investigations into disease-related targets and therapeutic development.