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- EMDB-28748: Cryo-EM structure of the S. cerevisiae guanine nucleotide exchang... -

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Basic information

Entry
Database: EMDB / ID: EMD-28748
TitleCryo-EM structure of the S. cerevisiae guanine nucleotide exchange factor Gea2
Map data
Sample
  • Complex: Stand-alone Gea2 homodimer
    • Protein or peptide: ARF guanine-nucleotide exchange factor 2
Keywordssmall GTPase / guanine nucleotide exchange factor / membrane trafficking / lipid flippase / trans-Golgi network / protein transport / LIPID TRANSPORT
Function / homology
Function and homology information


secretory granule organization / VxPx cargo-targeting to cilium / Golgi cis cisterna / trans-Golgi Network Vesicle Budding / COPI-dependent Golgi-to-ER retrograde traffic / COPI-mediated anterograde transport / regulation of ARF protein signal transduction / intra-Golgi vesicle-mediated transport / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / endoplasmic reticulum to Golgi vesicle-mediated transport ...secretory granule organization / VxPx cargo-targeting to cilium / Golgi cis cisterna / trans-Golgi Network Vesicle Budding / COPI-dependent Golgi-to-ER retrograde traffic / COPI-mediated anterograde transport / regulation of ARF protein signal transduction / intra-Golgi vesicle-mediated transport / retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum / endoplasmic reticulum to Golgi vesicle-mediated transport / guanyl-nucleotide exchange factor activity / macroautophagy / actin cytoskeleton organization / Golgi membrane / cytosol
Similarity search - Function
Mon2/Sec7/BIG1-like, HUS domain / Mon2/Sec7/BIG1-like, HUS domain / Sec7 domain / Sec7, C-terminal domain superfamily / Sec7 domain superfamily / Sec7 domain / SEC7 domain profile. / Sec7 domain
Similarity search - Domain/homology
ARF guanine-nucleotide exchange factor 2
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
Methodsingle particle reconstruction / cryo EM / Resolution: 3.7 Å
AuthorsDuan HD / Li H
Funding support United States, 1 items
OrganizationGrant numberCountry
National Institutes of Health/National Cancer Institute (NIH/NCI)CA231466 United States
CitationJournal: Nat Commun / Year: 2024
Title: Structural insight into an Arl1-ArfGEF complex involved in Golgi recruitment of a GRIP-domain golgin.
Authors: H Diessel Duan / Bhawik K Jain / Hua Li / Todd R Graham / Huilin Li /
Abstract: Arl1 is an Arf-like (Arl) GTP-binding protein that interacts with the guanine nucleotide exchange factor Gea2 to recruit the golgin Imh1 to the Golgi. The Arl1-Gea2 complex also binds and activates ...Arl1 is an Arf-like (Arl) GTP-binding protein that interacts with the guanine nucleotide exchange factor Gea2 to recruit the golgin Imh1 to the Golgi. The Arl1-Gea2 complex also binds and activates the phosphatidylserine flippase Drs2 and these functions may be related, although the underlying molecular mechanism is unclear. Here we report high-resolution cryo-EM structures of the full-length Gea2 and the Arl1-Gea2 complex. Gea2 is a large protein with 1459 residues and is composed of six domains (DCB, HUS, SEC7, HDS1-3). We show that Gea2 assembles a stable dimer via an extensive interface involving hydrophobic and electrostatic interactions in the DCB and HUS region. Contrary to the previous report on a Gea2 homolog in which Arl1 binds to the dimerization surface of the DCB domain, implying a disrupted dimer upon Arl1 binding, we find that Arl1 binds to the outside surface of the Gea2 DCB domain, leaving the Gea2 dimer intact. The interaction between Arl1 and Gea2 involves the classic FWY aromatic residue triad as well as two Arl1-specific residues. We show that key mutations that disrupt the Arl1-Gea2 interaction abrogate Imh1 Golgi association. This work clarifies the Arl1-Gea2 interaction and improves our understanding of molecular events in the membrane trafficking.
History
DepositionNov 1, 2022-
Header (metadata) releaseNov 15, 2023-
Map releaseNov 15, 2023-
UpdateMar 13, 2024-
Current statusMar 13, 2024Processing site: RCSB / Status: Released

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Structure visualization

Supplemental images

emd_28748.png

Downloads & links

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Map

FileDownload / File: emd_28748.map.gz / Format: CCP4 / Size: 512 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
0.83 Å/pix.
x 512 pix.
= 423.936 Å		0.83 Å/pix.
x 512 pix.
= 423.936 Å		0.83 Å/pix.
x 512 pix.
= 423.936 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 0.828 Å
Density

Histogram

Histogram (log scale)
Contour LevelBy AUTHOR: 0.01
Minimum - Maximum-0.03959505 - 2.192853
Average (Standard dev.)0.0010426103 (±0.021253552)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions512512512
Spacing512512512
CellA=B=C: 423.936 Å
α=β=γ: 90.0 °

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Supplemental data

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Sample components

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Entire : Stand-alone Gea2 homodimer

EntireName: Stand-alone Gea2 homodimer
Components
  • Complex: Stand-alone Gea2 homodimer
    • Protein or peptide: ARF guanine-nucleotide exchange factor 2

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Supramolecule #1: Stand-alone Gea2 homodimer

SupramoleculeName: Stand-alone Gea2 homodimer / type: complex / ID: 1 / Parent: 0 / Macromolecule list: all
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 337 KDa

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Macromolecule #1: ARF guanine-nucleotide exchange factor 2

MacromoleculeName: ARF guanine-nucleotide exchange factor 2 / type: protein_or_peptide / ID: 1 / Number of copies: 2 / Enantiomer: LEVO
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Molecular weightTheoretical: 168.590703 KDa
Recombinant expressionOrganism: Escherichia coli (E. coli)
SequenceString: MHHHHHHSSG VDLGTENLYF QSNAMSDREF VTVDPVTIII KECINLSTAM RKYSKFTSQS GVAALLGGGS EIFSNQDDYL AHTFNNLNT NKHNDPFLSG FIQLRLMLNK LKNLDNIDSL TILQPFLLIV STSSISGYIT SLALDSLQKF FTLNIINESS Q NYIGAHRA ...String:
MHHHHHHSSG VDLGTENLYF QSNAMSDREF VTVDPVTIII KECINLSTAM RKYSKFTSQS GVAALLGGGS EIFSNQDDYL AHTFNNLNT NKHNDPFLSG FIQLRLMLNK LKNLDNIDSL TILQPFLLIV STSSISGYIT SLALDSLQKF FTLNIINESS Q NYIGAHRA TVNALTHCRF EGSQQLSDDS VLLKVVFLLR SIVDSPYGDL LSNSIIYDVL QTILSLACNN RRSEVLRNAA QS TMIAVTV KIFSKLKTIE PVNVNQIYIN DESYTNDVLK ADTIGTNVES KEEGSQEDPI GMKVNNEEAI SEDDGIEEEH IHS EKSTNG AEQLDIVQKT TRSNSRIQAY ADDNYGLPVV RQYLNLLLSL IAPENELKHS YSTRIFGLEL IQTALEISGD RLQL YPRLF TLISDPIFKS ILFIIQNTTK LSLLQATLQL FTTLVVILGN NLQLQIELTL TRIFSILLDD GTANNSSSEN KNKPS IIKE LLIEQISILW TRSPSFFTST FINFDCNLDR ADVSINFLKA LTKLALPESA LTTTESVPPI CLEGLVSLVD DMFDHM KDI DREEFGRQKN EMEILKKRDR KTEFIECTNA FNEKPKKGIP MLIEKGFIAS DSDKDIAEFL FNNNNRMNKK TIGLLLC HP DKVSLLNEYI RLFDFSGLRV DEAIRILLTK FRLPGESQQI ERIIEAFSSA YCENQDYDPS KISDNAEDDI STVQPDAD S VFILSYSIIM LNTDLHNPQV KEHMSFEDYS GNLKGCCNHK DFPFWYLDRI YCSIRDKEIV MPEEHHGNEK WFEDAWNNL ISSTTVITEI KKDTQSVMDK LTPLELLNFD RAIFKQVGPS IVSTLFNIYV VASDDHISTR MITSLDKCSY ISAFFDFKDL FNDILNSIA KGTTLINSSH DDELSTLAFE YGPMPLVQIK FEDTNTEIPV STDAVRFGRS FKGQLNTVVF FRIIRRNKDP K IFSKELWL NIVNIILTLY EDLILSPDIF PDLQKRLKLS NLPKPSPEIS INKSKESKGL LSTFASYLKG DEEPTEEEIK SS KKAMECI KSSNIAASVF GNESNITADL IKTLLDSAKT EKNADNSRYF EAELLFIIEL TIALFLFCKE EKELGKFILQ KVF QLSHTK GLTKRTVRRM LTYKILLISL CADQTEYLSK LINDELLKKG DIFTQKFFAT NQGKEFLKRL FSLTESEFYR GFLL GNENF WKFLRKVTAM KEQSESIFEY LNESIKTDSN ILTNENFMWV LGLLDEISSM GAVGNHWEIE YKKLTESGHK IDKEN PYKK SIELSLKSIQ LTSHLLEDNN DLRKNEIFAI IQALAHQCIN PCKQISEFAV VTLEQTLINK IEIPTNEMES VEELIE GGL LPLLNSSETQ EDQKILISSI LTIISNVYLH YLKLGKTSNE TFLKILSIFN KFVEDSDIEK KLQQLILDKK SIEKGNG SS SHGSAHEQTP ESNDVEIEAT APIDDNTDDD NKPKLSDVEK D

UniProtKB: ARF guanine-nucleotide exchange factor 2

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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: 7.4
VitrificationCryogen name: ETHANE

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Electron microscopy

MicroscopeFEI TITAN KRIOS
Image recordingFilm or detector model: GATAN K3 (6k x 4k) / Average electron dose: 69.0 e/Å2
Electron beamAcceleration voltage: 300 kV / Electron source: FIELD EMISSION GUN
Electron opticsIllumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 1.7 µm / Nominal defocus min: 1.3 µm
Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company

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Image processing

Startup modelType of model: PDB ENTRY
PDB model - PDB ID:

8ezj

Final reconstructionResolution.type: BY AUTHOR / Resolution: 3.7 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 435876
Initial angle assignmentType: MAXIMUM LIKELIHOOD
Final angle assignmentType: MAXIMUM LIKELIHOOD

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