1QQE

CRYSTAL STRUCTURE OF THE VESICULAR TRANSPORT PROTEIN SEC17

• PDB DOI: https://doi.org/10.2210/pdb1QQE/pdb

• Classification: PROTEIN TRANSPORT
• Organism(s): Saccharomyces cerevisiae
• Expression System: Escherichia coli
• Mutation(s): Yes 
• Membrane Protein: Yes  OPM


• Deposited: 1999-06-04 Released: 1999-09-08 
• Deposition Author(s): Rice, L.M., Brunger, A.T.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.283 
• R-Value Work: 0.260 
• R-Value Observed: 0.262 

Literature

Crystal structure of the vesicular transport protein Sec17: implications for SNAP function in SNARE complex disassembly.

Rice, L.M., Brunger, A.T.

(1999) Mol Cell 4: 85-95

• PubMed: 10445030 
• DOI: https://doi.org/10.1016/s1097-2765(00)80190-2
• Primary Citation of Related Structures:  
  1QQE


• PubMed Abstract: 
  

  SNAP proteins play an essential role in membrane trafficking in eukaryotic cells. They activate and recycle SNARE proteins by serving as adaptors between SNAREs and the cytosolic chaperone NSF. We have determined the crystal structure of Sec17, the yeast homolog of alpha-SNAP, to 2.9 A resolution. Sec17 is composed of an N-terminal twisted sheet of alpha-helical hairpins and a C-terminal alpha-helical bundle. The N-terminal sheet has local similarity to the tetratricopeptide repeats from protein phosphatase 5 but has a different overall twist. Sec17 also shares structural features with HEAT and clathrin heavy chain repeats. Possible models of SNAP:SNARE binding suggest that SNAPs may function as lever arms, transmitting forces generated by conformational changes in NSF/Sec18 to drive disassembly of SNARE complexes.

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Organizational Affiliation: 

Howard Hughes Medical Institute, Yale University, New Haven, Connecticut 06520, USA.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 32.82 kDa 
• Atom Count: 2,220 
• Modelled Residue Count: 281 
• Deposited Residue Count: 292 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
VESICULAR TRANSPORT PROTEIN SEC17	A	292	Saccharomyces cerevisiae	Mutation(s): 1  Membrane Entity: Yes
UniProt
Find proteins for P32602 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P32602  Go to UniProtKB:  P32602

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.90 Å
• R-Value Free: 0.283 
• R-Value Work: 0.260 
• R-Value Observed: 0.262 
• Space Group: P 4₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 107.9	α = 90
b = 107.9	β = 90
c = 46.1	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
ADSC	data collection
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-09-08 
Deposition Author(s): Rice, L.M., Brunger, A.T.

Revision History  

• Version 1.0: 1999-09-08
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-03
  Changes: Database references
• Version 1.4: 2024-02-14
  Changes: Data collection