Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 91.74 kDa 
• Atom Count: 6116 
• Residue Count: 753 
• Unique protein chains: 2

1PCX

Crystal structure of the COPII coat subunit, Sec24, complexed with a peptide from the SNARE protein Bet1

• DOI: 10.2210/pdb1PCX/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Saccharomyces cerevisiae
• Mutation(s): No 


• Deposited: 2003-05-18 Released: 2003-08-19 
• Deposition Author(s): Mossessova, E., Bickford, L.C., Goldberg, J.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.259 
• R-Value Work: 0.217 
• R-Value Observed: 0.217 

Literature

SNARE selectivity of the COPII coat.

Mossessova, E., Bickford, L.C., Goldberg, J.

(2003) Cell 114: 483-495

• PubMed: 12941276 
• DOI: 10.1016/s0092-8674(03)00608-1
• Primary Citation of Related Structures:  
  1PCX, 1PD1, 1PD0


• PubMed Abstract: 
  

The COPII coat buds transport vesicles from the endoplasmic reticulum that incorporate cargo and SNARE molecules. Here, we show that recognition of the ER-Golgi SNAREs Bet1, Sed5, and Sec22 occurs through three binding sites on the Sec23/24 subcomplex of yeast COPII. The A site binds to the YNNSNPF motif of Sed5. The B site binds to Lxx-L/M-E sequences present in both the Bet1 and Sed5 molecules, as well as to the DxE cargo-sorting signal. A third, spatially distinct site binds to Sec22. COPII selects the free v-SNARE form of Bet1 because the LxxLE sequence is sequestered in the four-helix bundle of the v-/t-SNARE complex. COPII favors Sed5 within the Sed5/Bos1/Sec22 t-SNARE complex because t-SNARE assembly removes autoinhibitory contacts to expose the YNNSNPF motif. The COPII coat seems to be a specific conductor of the fusogenic forms of these SNAREs, suggesting how vesicle fusion specificity may be programmed during budding.

---

Organizational Affiliation: 

Howard Hughes Medical Institute and the Cellular Biochemistry and Biophysics Program, Memorial Sloan-Kettering Cancer Center, 1275 York Avenue, New York, NY 10021, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein transport protein Sec24	A	810	Saccharomyces cerevisiae	Mutation(s): 0
Find proteins for P40482 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P40482  Go to UniProtKB:  P40482

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
COPII-binding peptide of the protein transport protein BET1	B	8	N/A	Mutation(s): 0
Find proteins for P22804 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c)) Explore P22804  Go to UniProtKB:  P22804

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.259 
• R-Value Work: 0.217 
• R-Value Observed: 0.217 
• Space Group: P 3₂ 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 94.93	α = 90
b = 94.93	β = 90
c = 198.574	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
AMoRE	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2003-05-18 
• Released Date: 2003-08-19 
Deposition Author(s): Mossessova, E., Bickford, L.C., Goldberg, J.

Revision History 

• Version 1.0: 2003-08-19
  Type: Initial release
  
• Version 1.1: 2008-04-29
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance