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- PDB-6bbp: Model for compact volume of truncated monomeric Cytohesin-3 (Grp1... -
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Basic information
Entry | Database: PDB / ID: 6bbp | ||||||
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Title | Model for compact volume of truncated monomeric Cytohesin-3 (Grp1; amino acids 63-399) E161A 6GS Arf6 Q67L fusion protein | ||||||
![]() | Cytohesin-3,ADP-ribosylation factor 6 | ||||||
![]() | LIPID BINDING PROTEIN / Guanine nucleotide exchange factor / Arf GTPase / Fusion protein / Inositol 1 / 3 / 4 / 5-tetrakisphosphate | ||||||
Function / homology | ![]() erythrocyte apoptotic process / maintenance of postsynaptic density structure / Intra-Golgi traffic / protein localization to cleavage furrow / positive regulation of mitotic cytokinetic process / negative regulation of dendrite development / Golgi vesicle transport / establishment of epithelial cell polarity / regulation of dendritic spine development / regulation of Rac protein signal transduction ...erythrocyte apoptotic process / maintenance of postsynaptic density structure / Intra-Golgi traffic / protein localization to cleavage furrow / positive regulation of mitotic cytokinetic process / negative regulation of dendrite development / Golgi vesicle transport / establishment of epithelial cell polarity / regulation of dendritic spine development / regulation of Rac protein signal transduction / protein localization to endosome / negative regulation of protein localization to cell surface / negative regulation of receptor-mediated endocytosis / ruffle assembly / positive regulation of keratinocyte migration / positive regulation of focal adhesion disassembly / regulation of filopodium assembly / regulation of ARF protein signal transduction / endocytic recycling / MET receptor recycling / thioesterase binding / Flemming body / filopodium membrane / protein localization to cell surface / TBC/RABGAPs / cortical actin cytoskeleton organization / positive regulation of actin filament polymerization / hepatocyte apoptotic process / phosphatidylinositol-3,4,5-trisphosphate binding / cleavage furrow / synaptic vesicle endocytosis / endocytic vesicle / regulation of presynapse assembly / bicellular tight junction / vesicle-mediated transport / ruffle / signaling adaptor activity / positive regulation of cell adhesion / guanyl-nucleotide exchange factor activity / liver development / small monomeric GTPase / protein localization to plasma membrane / positive regulation of protein secretion / adherens junction / positive regulation of protein localization to plasma membrane / intracellular protein transport / cellular response to nerve growth factor stimulus / positive regulation of neuron projection development / recycling endosome membrane / GDP binding / nervous system development / presynapse / Clathrin-mediated endocytosis / G protein activity / midbody / cell cortex / early endosome membrane / cell differentiation / postsynapse / endosome / cell adhesion / cell division / focal adhesion / GTPase activity / GTP binding / glutamatergic synapse / Golgi apparatus / extracellular exosome / nucleoplasm / membrane / plasma membrane / cytosol / cytoplasm Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / negative staining / Resolution: 35 Å | ||||||
![]() | Das, S. / Malaby, A.W. / Lambright, D.G. | ||||||
Funding support | ![]()
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![]() | ![]() Title: Structural Dynamics Control Allosteric Activation of Cytohesin Family Arf GTPase Exchange Factors. Authors: Andrew W Malaby / Sanchaita Das / Srinivas Chakravarthy / Thomas C Irving / Osman Bilsel / David G Lambright / ![]() Abstract: Membrane dynamic processes including vesicle biogenesis depend on Arf guanosine triphosphatase (GTPase) activation by guanine nucleotide exchange factors (GEFs) containing a catalytic Sec7 domain and ...Membrane dynamic processes including vesicle biogenesis depend on Arf guanosine triphosphatase (GTPase) activation by guanine nucleotide exchange factors (GEFs) containing a catalytic Sec7 domain and a membrane-targeting module such as a pleckstrin homology (PH) domain. The catalytic output of cytohesin family Arf GEFs is controlled by autoinhibitory interactions that impede accessibility of the exchange site in the Sec7 domain. These restraints can be relieved through activator Arf-GTP binding to an allosteric site comprising the PH domain and proximal autoinhibitory elements (Sec7-PH linker and C-terminal helix). Small-angle X-ray scattering and negative-stain electron microscopy were used to investigate the structural organization and conformational dynamics of cytohesin-3 (Grp1) in autoinhibited and active states. The results support a model in which hinge dynamics in the autoinhibited state expose the activator site for Arf-GTP binding, while subsequent C-terminal helix unlatching and repositioning unleash conformational entropy in the Sec7-PH linker to drive exposure of the exchange site. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 107.8 KB | Display | ![]() |
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PDB format | ![]() | 76.9 KB | Display | ![]() |
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-Validation report
Arichive directory | ![]() ![]() | HTTPS FTP |
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-Related structure data
Related structure data | ![]() 7077MC ![]() 7078C ![]() 6bbqC M: map data used to model this data C: citing same article ( |
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Similar structure data | |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 60292.777 Da / Num. of mol.: 1 / Mutation: E161A,E161A Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() Gene: Cyth3, Grp1, Pscd3, ARF6 / Production host: ![]() ![]() |
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#2: Chemical | ChemComp-GTP / |
#3: Chemical | ChemComp-MG / |
#4: Chemical | ChemComp-4IP / |
Has protein modification | Y |
-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: Truncated monomeric Cytohesin-3 (Grp1; amino acids 63-399) E161A 6GS Arf6 Q67L fusion protein complex with GTP, Mg and Inositol 1,3,4,5 tetrakisphosphate Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 8 Details: 20 mM Tris, pH 8.0, 150 mM NaCl, 2 mM MgCl2, 0.1% 2-mercaptoethanol, and 0.001 mM IP4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: YES / Vitrification applied: NO |
EM staining | Type: NEGATIVE / Details: Stained with 0.75% (w/v) uranyl formate / Material: Uranyl Formate |
Specimen support | Grid material: COPPER / Grid mesh size: 400 divisions/in. |
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Electron microscopy imaging
Microscopy | Model: FEI TECNAI 12 Details: Gatan Erlang Shen 785 camera used for collecting images |
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Electron gun | Electron source: LAB6 / Accelerating voltage: 120 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 60000 X / Nominal defocus max: 3200 nm / Nominal defocus min: 1200 nm / Cs: 2 mm |
Image recording | Electron dose: 20 e/Å2 / Film or detector model: OTHER / Num. of grids imaged: 1 / Num. of real images: 369 Details: Gatan Erlang Shen 785 camera used for collecting images |
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Processing
EM software |
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Image processing | Details: The images were X-ray corrected | ||||||||||||||||
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||
Particle selection | Num. of particles selected: 10000 / Details: EMAN2 based manual particle picking | ||||||||||||||||
3D reconstruction | Resolution: 35 Å / Resolution method: FSC 0.5 CUT-OFF / Num. of particles: 6504 / Num. of class averages: 71 / Symmetry type: POINT | ||||||||||||||||
Refinement | Highest resolution: 35 Å |