4Q66

Structure of Exomer bound to Arf1.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.35 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.279 
  • R-Value Observed: 0.280 

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Literature

Structural basis for membrane binding and remodeling by the exomer secretory vesicle cargo adaptor.

Paczkowski, J.E.Fromme, J.C.

(2014) Dev Cell 30: 610-624

  • DOI: 10.1016/j.devcel.2014.07.014
  • Primary Citation of Related Structures:  
    4Q66

  • PubMed Abstract: 
  • Cargo adaptor subunits of vesicle coat protein complexes sort transmembrane proteins to distinct membrane compartments in eukaryotic cells. The exomer complex is the only cargo adaptor known to sort proteins at the trans-Golgi network into secretory vesicles ...

    Cargo adaptor subunits of vesicle coat protein complexes sort transmembrane proteins to distinct membrane compartments in eukaryotic cells. The exomer complex is the only cargo adaptor known to sort proteins at the trans-Golgi network into secretory vesicles. Exomer function is regulated by the Arf1 GTPase, a master regulator of trafficking at the Golgi. We report the structure of exomer bound to two copies of Arf1. Exomer interacts with each Arf1 molecule via two surfaces, one of which is a noncanonical interface that regulates GTP hydrolysis. The structure uncovers an unexpected membrane-proximal hydrophobic element that exomer uses in cooperation with Arf1 to remodel membranes. Given the constrained motion of the exomer hinge region, we envision that exomer dynamically positions multiple membrane insertion elements to drive membrane fission. In contrast to other known cargo adaptors, exomer therefore couples two functions, cargo sorting and membrane fission, into a single complex.


    Organizational Affiliation

    Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, NY 14853, USA. Electronic address: jcf14@cornell.edu.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Chs5pA,
D,
C [auth G],
B [auth J]
368Saccharomyces cerevisiae R008Mutation(s): 0 
Gene Names: CAL3Chs5L8543.18R008_L12446YLR330W
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Protein Feature View
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Protein BCH1G [auth B],
F [auth E],
H,
E [auth K]
739Saccharomyces cerevisiae S288CMutation(s): 0 
Gene Names: BCH1YMR237WYM9959.19
UniProt
Find proteins for Q05029 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore Q05029 
Go to UniProtKB:  Q05029
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UniProt GroupQ05029
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
ADP-ribosylation factor 1K [auth C],
I [auth F],
L [auth I],
J [auth L]
175Saccharomyces cerevisiae S288CMutation(s): 1 
Gene Names: ARF1YDL192WD1244
UniProt
Find proteins for P11076 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Explore P11076 
Go to UniProtKB:  P11076
Entity Groups  
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UniProt GroupP11076
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.35 Å
  • R-Value Free: 0.310 
  • R-Value Work: 0.279 
  • R-Value Observed: 0.280 
  • Space Group: P 1 21 1
  • Diffraction Data DOI: 10.15785/SBGRID/75 SBGrid
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 114.659α = 90
b = 208.168β = 105.48
c = 155.078γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-09-17
    Type: Initial release
  • Version 1.1: 2014-12-31
    Changes: Database references