1CR5

N-TERMINAL DOMAIN OF SEC18P


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal structure of the Sec18p N-terminal domain.

Babor, S.M.Fass, D.

(1999) Proc.Natl.Acad.Sci.USA 96: 14759-14764


  • PubMed Abstract: 
  • Yeast Sec18p and its mammalian orthologue N-ethylmaleimide-sensitive fusion protein (NSF) are hexameric ATPases with a central role in vesicle trafficking. Aided by soluble adapter factors (SNAPs), Sec18p/NSF induces ATP-dependent disassembly of a co ...

    Yeast Sec18p and its mammalian orthologue N-ethylmaleimide-sensitive fusion protein (NSF) are hexameric ATPases with a central role in vesicle trafficking. Aided by soluble adapter factors (SNAPs), Sec18p/NSF induces ATP-dependent disassembly of a complex of integral membrane proteins from the vesicle and target membranes (SNAP receptors). During the ATP hydrolysis cycle, the Sec18p/NSF homohexamer undergoes a large-scale conformational change involving repositioning of the most N terminal of the three domains of each protomer, a domain that is required for SNAP-mediated interaction with SNAP receptors. Whether an internal conformational change in the N-terminal domains accompanies their reorientation with respect to the rest of the hexamer remains to be addressed. We have determined the structure of the N-terminal domain from Sec18p by x-ray crystallography. The Sec18p N-terminal domain consists of two beta-sheet-rich subdomains connected by a short linker. A conserved basic cleft opposite the linker may constitute a SNAP-binding site. Despite structural variability in the linker region and in an adjacent loop, all three independent molecules in the crystal asymmetric unit have the identical subdomain interface, supporting the notion that this interface is a preferred packing arrangement. However, the linker flexibility allows for the possibility that other subdomain orientations may be sampled.


    Organizational Affiliation

    Department of Structural Biology, Weizmann Institute of Science, Rehovot 76100, Israel.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SEC18P (RESIDUES 22 - 210)
A, B, C
189Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Gene Names: SEC18
Find proteins for P18759 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P18759
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NEN
Query on NEN

Download SDF File 
Download CCD File 
A, B, C
1-ETHYL-PYRROLIDINE-2,5-DIONE
C6 H9 N O2
GHAZCVNUKKZTLG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.277 
  • R-Value Work: 0.230 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 93.710α = 90.00
b = 32.140β = 118.70
c = 94.850γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHARPphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1999-08-13 
  • Released Date: 1999-12-22 
  • Deposition Author(s): Babor, S.M., Fass, D.

Revision History 

  • Version 1.0: 1999-12-22
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance