2NUP

Crystal Structure of the human Sec23a/24a heterodimer, complexed with the SNARE protein Sec22b


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

The Transport Signal on Sec22 for Packaging into COPII-Coated Vesicles is a Conformational Epitope

Mancias, J.D.Goldberg, J.

(2007) Mol.Cell 26: 403-414

  • DOI: 10.1016/j.molcel.2007.03.017
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The mechanism of cargo concentration into ER-derived vesicles involves interactions between the COPII vesicular coat complex and cargo transport signals--peptide sequences of 10-15 residues. The SNARE protein Sec22 contains a signal that binds the CO ...

    The mechanism of cargo concentration into ER-derived vesicles involves interactions between the COPII vesicular coat complex and cargo transport signals--peptide sequences of 10-15 residues. The SNARE protein Sec22 contains a signal that binds the COPII subcomplex Sec23/24 and specifies its endoplasmic reticulum (ER) exit as an unassembled SNARE. The 200 kDa crystal structure of Sec22 bound to Sec23/24 reveals that the transport signal is a folded epitope rather than a conventional short peptide sequence. The NIE segment of the SNARE motif folds against the N-terminal longin domain, and this closed form of Sec22 binds at the Sec23/24 interface. Thus, COPII recognizes unassembled Sec22 via a folded epitope, whereas Sec22 assembly into SNARE complexes would mask the NIE segment. The concept of a conformational epitope as a transport signal suggests packaging mechanisms in which a coat is sensitive to the folded state of a cargo protein or the assembled state of a multiprotein complex.


    Organizational Affiliation

    Howard Hughes Medical Institute, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein Sec23A
A
769Homo sapiensMutation(s): 0 
Gene Names: SEC23A
Find proteins for Q15436 (Homo sapiens)
Go to Gene View: SEC23A
Go to UniProtKB:  Q15436
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Protein transport protein Sec24A
B
753Homo sapiensMutation(s): 0 
Gene Names: SEC24A
Find proteins for O95486 (Homo sapiens)
Go to Gene View: SEC24A
Go to UniProtKB:  O95486
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Vesicle-trafficking protein SEC22b
C
196Homo sapiensMutation(s): 0 
Gene Names: SEC22B (SEC22L1)
Find proteins for O75396 (Homo sapiens)
Go to Gene View: SEC22B
Go to UniProtKB:  O75396
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.8 Å
  • R-Value Free: 0.275 
  • R-Value Work: 0.202 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 148.200α = 90.00
b = 97.400β = 90.23
c = 129.620γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
HKL-2000data collection
SCALEPACKdata scaling
PHASERphasing
HKL-2000data reduction
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-22
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description