6TZT

Crystal structure of human alpha/epsilon-COP of the COPI vesicular coat bound to alpha-COP STM2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.065 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.178 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Roles of singleton tryptophan motifs in COPI coat stability and vesicle tethering.

Travis, S.M.Kokona, B.Fairman, R.Hughson, F.M.

(2019) Proc.Natl.Acad.Sci.USA --: --

  • DOI: 10.1073/pnas.1909697116
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Coat protein I (COPI)-coated vesicles mediate retrograde transport from the Golgi to the endoplasmic reticulum (ER), as well as transport within the Golgi. Major progress has been made in defining the structure of COPI coats, in vitro and in vivo, at ...

    Coat protein I (COPI)-coated vesicles mediate retrograde transport from the Golgi to the endoplasmic reticulum (ER), as well as transport within the Golgi. Major progress has been made in defining the structure of COPI coats, in vitro and in vivo, at resolutions as high as 9 Å. Nevertheless, important questions remain unanswered, including what specific interactions stabilize COPI coats, how COPI vesicles recognize their target membranes, and how coat disassembly is coordinated with vesicle fusion and cargo delivery. Here, we use X-ray crystallography to identify a conserved site on the COPI subunit α-COP that binds to flexible, acidic sequences containing a single tryptophan residue. One such sequence, found within α-COP itself, mediates α-COP homo-oligomerization. Another such sequence is contained within the lasso of the ER-resident Dsl1 complex, where it helps mediate the tethering of Golgi-derived COPI vesicles at the ER membrane. Together, our findings suggest that α-COP homo-oligomerization plays a key role in COPI coat stability, with potential implications for the coordination of vesicle tethering, uncoating, and fusion.


    Organizational Affiliation

    Department of Biology, Haverford College, Haverford, PA 19041.,Department of Molecular Biology, Princeton University, Princeton, NJ 08544.,Department of Chemistry, Haverford College, Haverford, PA 19041.,Department of Molecular Biology, Princeton University, Princeton, NJ 08544; hughson@princeton.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Coatomer subunit epsilon
A, C
322Homo sapiensMutation(s): 0 
Gene Names: COPE
Find proteins for O14579 (Homo sapiens)
Go to Gene View: COPE
Go to UniProtKB:  O14579
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Coatomer subunit alpha
B, D
356Homo sapiensMutation(s): 0 
Gene Names: COPA
Find proteins for P53621 (Homo sapiens)
Go to Gene View: COPA
Go to UniProtKB:  P53621
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.065 Å
  • R-Value Free: 0.223 
  • R-Value Work: 0.178 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 138.470α = 90.00
b = 138.470β = 90.00
c = 192.868γ = 120.00
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
PHENIXrefinement
Aimlessdata scaling
PHASERphasing
XDSdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01GM071574
National Institutes of Health/National Institute of General Medical SciencesUnited StatesF31GM12676
National Institutes of Health/National Institute of General Medical SciencesUnited StatesT32GM007388

Revision History 

  • Version 1.0: 2019-11-13
    Type: Initial release
  • Version 1.1: 2019-11-27
    Type: Database references