2PSP

Porcine pancreatic spasmolytic polypeptide


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • 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, whi ...

    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.


    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


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PORCINE PANCREATIC SPASMOLYTIC POLYPEPTIDE
A, B
106Sus scrofaMutation(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
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
A, B
L-PEPTIDE LINKINGC5 H7 N O3GLU
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 = 60.600α = 90.00
b = 60.600β = 90.00
c = 113.100γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
DENZOdata reduction
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

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