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- EMDB-26753: Focused map of the dimer interface of the Gea2-Arf1 activation in... -

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Basic information

Entry
Database: EMDB / ID: EMD-26753
TitleFocused map of the dimer interface of the Gea2-Arf1 activation intermediate complex
Map data
Sample
  • Complex: Gea2
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.1 Å
AuthorsMuccini A / Fromme JC
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM136258 United States
CitationJournal: Cell Rep / Year: 2022
Title: Structural basis for activation of Arf1 at the Golgi complex.
Authors: Arnold J Muccini / Margaret A Gustafson / J Christopher Fromme /
Abstract: The Golgi complex is the central sorting station of the eukaryotic secretory pathway. Traffic through the Golgi requires activation of Arf guanosine triphosphatases that orchestrate cargo sorting and ...The Golgi complex is the central sorting station of the eukaryotic secretory pathway. Traffic through the Golgi requires activation of Arf guanosine triphosphatases that orchestrate cargo sorting and vesicle formation by recruiting an array of effector proteins. Arf activation and Golgi membrane association is controlled by large guanine nucleotide exchange factors (GEFs) possessing multiple conserved regulatory domains. Here we present cryoelectron microscopy (cryoEM) structures of full-length Gea2, the yeast paralog of the human Arf-GEF GBF1, that reveal the organization of these regulatory domains and explain how Gea2 binds to the Golgi membrane surface. We find that the GEF domain adopts two different conformations compatible with different stages of the Arf activation reaction. The structure of a Gea2-Arf1 activation intermediate suggests that the movement of the GEF domain primes Arf1 for membrane insertion upon guanosine triphosphate binding. We propose that conformational switching of Gea2 during the nucleotide exchange reaction promotes membrane insertion of Arf1.
History
DepositionApr 26, 2022-
Header (metadata) releaseAug 24, 2022-
Map releaseAug 24, 2022-
UpdateSep 14, 2022-
Current statusSep 14, 2022Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_26753.png

Downloads & links

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Map

FileDownload / File: emd_26753.map.gz / Format: CCP4 / Size: 28.7 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

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AxesX (Sec.)Y (Row.)Z (Col.)
1.66 Å/pix.
x 196 pix.
= 326.144 Å		1.66 Å/pix.
x 196 pix.
= 326.144 Å		1.66 Å/pix.
x 196 pix.
= 326.144 Å

Surface

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Images are generated by Spider.

Voxel sizeX=Y=Z: 1.664 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.431
Minimum - Maximum-1.4075848 - 1.9191843
Average (Standard dev.)6.1652286e-06 (±0.037327494)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderZYX
Origin000
Dimensions196196196
Spacing196196196
CellA=B=C: 326.144 Å
α=β=γ: 90.0 °

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Supplemental data

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Mask #1

Fileemd_26753_msk_1.map
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Half map: #1

Fileemd_26753_half_map_1.map
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Half map: #2

Fileemd_26753_half_map_2.map
Projections & Slices
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Sample components

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Entire : Gea2

EntireName: Gea2
Components
  • Complex: Gea2

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Supramolecule #1: Gea2

SupramoleculeName: Gea2 / type: complex / Chimera: Yes / ID: 1 / Parent: 0 / Macromolecule list: #1
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Recombinant expressionOrganism: Komagataella pastoris (fungus)

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Experimental details

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Structure determination

Methodcryo EM
Processingsingle particle reconstruction
Aggregation stateparticle

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Sample preparation

BufferpH: 8
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TALOS ARCTICA
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 1.0 e/Å2
Electron beamAcceleration voltage: 200 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.0 µm / Nominal defocus min: 1.0 µm
Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company

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Image processing

Final reconstructionResolution.type: BY AUTHOR / Resolution: 4.1 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 391360
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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