3EH2

Crystal structure of the human COPII-coat protein Sec24c


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.241 

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This is version 1.2 of the entry. See complete history


Literature

Structural basis of cargo membrane protein discrimination by the human COPII coat machinery.

Mancias, J.D.Goldberg, J.

(2008) EMBO J 27: 2918-2928

  • DOI: https://doi.org/10.1038/emboj.2008.208
  • Primary Citation of Related Structures:  
    3EFO, 3EG9, 3EGD, 3EGX, 3EH1, 3EH2

  • PubMed Abstract: 

    Genomic analysis shows that the increased complexity of trafficking pathways in mammalian cells involves an expansion of the number of SNARE, Rab and COP proteins. Thus, the human genome encodes four forms of Sec24, the cargo selection subunit of the COPII vesicular coat, and this is proposed to increase the range of cargo accommodated by human COPII-coated vesicles. In this study, we combined X-ray crystallographic and biochemical analysis with functional assays of cargo packaging into COPII vesicles to establish molecular mechanisms for cargo discrimination by human Sec24 subunits. A conserved IxM packaging signal binds in a surface groove of Sec24c and Sec24d, but the groove is occluded in the Sec24a and Sec24b subunits. Conversely, LxxLE class transport signals and the DxE signal of VSV glycoprotein are selectively bound by Sec24a and Sec24b subunits. A comparative analysis of crystal structures of the four human Sec24 isoforms establishes the structural determinants for discrimination among these transport signals, and provides a framework to understand how an expansion of coat subunits extends the range of cargo proteins packaged into COPII-coated vesicles.


  • Organizational Affiliation

    Howard Hughes Medical Institute and the Structural Biology Program, Memorial Sloan-Kettering Cancer Center, New York, NY 10065, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Protein transport protein Sec24C
A, B, C
766Homo sapiensMutation(s): 0 
Gene Names: SEC24C
UniProt & NIH Common Fund Data Resources
Find proteins for P53992 (Homo sapiens)
Explore P53992 
Go to UniProtKB:  P53992
PHAROS:  P53992
GTEx:  ENSG00000176986 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP53992
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.35 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.241 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.69α = 90
b = 182.98β = 90
c = 201.83γ = 90
Software Package:
Software NamePurpose
CBASSdata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-10-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2024-02-21
    Changes: Data collection, Database references, Derived calculations