Biological Assembly 1  

 3D View: Structure | Electron Density

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Protein Workshop | Ligand Explorer

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

 3D View: Structure | Electron Density

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23470.61 
• Atom Count: 1624 
• Residue Count: 212 
• Unique protein chains: 1

2PSP

Porcine pancreatic spasmolytic polypeptide

• DOI: 10.2210/pdb2PSP/pdb

• Classification: SIGNALING PROTEIN
• Organism(s): Sus scrofa


• Deposited: 1996-02-01 Released: 1996-07-11 
• Deposition Author(s): Petersen, T.N., Henriksen, A., Gajhede, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.258 
• R-Value Work: 0.198 

Literature

Structure of porcine pancreatic spasmolytic polypeptide at 1.95 A resolution.

Petersen, T.N., Henriksen, A., Gajhede, M.

(1996) Acta Crystallogr.,Sect.D 52: 730-737

• PubMed: 15299636 
• DOI: 10.1107/S0907444996001345


• PubMed Abstract: 
  

The structure of a trigonal crystal form of porcine pancreatic spasmolytic polypeptide (PSP) has been solved by molecular replacement and refined to 1.95 A resolution. Three heavy-atom derivatives were prepared, giving unbiased phase information, which was used in the model building of the protein molecules. The final conventional R value is 19.8% with the inclusion of 183 water molecules. PSP crystallizes as a dimer in space group P3(1)21 with a non-crystallographic twofold axis relating the monomers. The monomer consists of two very similar domains each composed of three loop regions. Two clefts are found in the monomer, one in each domain, that are proposed as possible substrate-binding sites. Important interactions have been identified in the proposed substrate-binding sites, where conserved water molecules probably mimic the hydrophilic positions of the substrate. The estimated cleft size is 9 x 9 x 12 A. Analysis of the charge distribution within the clefts, by an electrostatic potential calculation, shows the clefts to be essentially non-charged.

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Related Citations: 

• Pancreatic Spasmolytic Polypeptide: First Three-Dimensional Structure of a Member of the Mammalian Trefoil Family of Peptides
  Gajhede, M.,Petersen, T.N.,Henriksen, A.,Petersen, J.F.,Dauter, Z.,Wilson, K.S.,Thim, L.
  (1993) Structure 1: 253




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Organizational Affiliation: 

Centre for Crystallographic Studies, Universitetsparken, Department of Chemsistry, University of Copenhagen, Denmark.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PORCINE PANCREATIC SPASMOLYTIC POLYPEPTIDE	A, B	106	Sus scrofa	Mutation(s): 0  Gene Names: TFF2 (SML1)
Find proteins for P01359 (Sus scrofa) Go to Gene View: TFF2 Go to UniProtKB:  P01359

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA	A, B	L-PEPTIDE LINKING	C5 H7 N O3		GLU

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.95 Å
• R-Value Free: 0.258 
• R-Value Work: 0.198 
• Space Group: P 3₁ 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 60.600	α = 90.00
b = 60.600	β = 90.00
c = 113.100	γ = 120.00

Software Package:

Software Name	Purpose
X-PLOR	phasing
X-PLOR	refinement
DENZO	data reduction
X-PLOR	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1996-02-01 
• Released Date: 1996-07-11 
• Deposition Author(s): Petersen, T.N., Henriksen, A., Gajhede, M.

Revision History 

• Version 1.0: 1996-07-11
  Type: Initial release
• Version 1.1: 2008-03-25
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance