1PSP

PANCREATIC SPASMOLYTIC POLYPEPTIDE: FIRST THREE-DIMENSIONAL STRUCTURE OF A MEMBER OF THE MAMMALIAN TREFOIL FAMILY OF PEPTIDES

• PDB DOI: https://doi.org/10.2210/pdb1PSP/pdb

• Classification: SPASMOLYTIC PROTEIN
• Organism(s): Sus scrofa
• Mutation(s): No 


• Deposited: 1994-01-05 Released: 1994-04-30 
• Deposition Author(s): Gajhede, M., Petersen, T.N., Henriksen, A., Petersen, J.F.W., Dauter, Z., Wilson, K.S., Thim, L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Work: 0.200 
• R-Value Observed: 0.200 

Literature

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: 253-262

• PubMed: 8081739 
• DOI: https://doi.org/10.1016/0969-2126(93)90014-8
• Primary Citation of Related Structures:  
  1PSP


• PubMed Abstract: 
  

  The trefoil peptides are a rapidly growing family of peptides, mainly found in the gastrointestinal tract. There is circumstantial evidence that they stabilize the mucus layer, and may affect the rate of healing of the mucosal epithelium. We have determined the structure of porcine pancreatic spasmolytic polypeptide (PSP) to 2.5 A resolution. The polypeptide contains two trefoil domains. The domain structure is compact, and is composed of a central short antiparallel beta-sheet with one short helix above and one below it. This is a novel motif. The two domains are related by two-fold symmetry, and each domain contains a cleft. The cleft within each domain could accommodate a polysaccharide chain, and may therefore be responsible for binding mucin glycoproteins. We suggest that PSP may cross-link glycoproteins, explaining its ability to stabilize the mucus layer.

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Organizational Affiliation: 

Department of Chemistry, H.C. Orsted Institute, University of Copenhagen, Denmark.

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Biological Assembly 2  

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

Biological assembly 2 assigned by authors.

Macromolecule Content

• Total Structure Weight: 23.47 kDa 
• Atom Count: 1,712 
• Modelled Residue Count: 212 
• Deposited Residue Count: 212 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PANCREATIC SPASMOLYTIC POLYPEPTIDE	A, B	106	Sus scrofa	Mutation(s): 0
UniProt
Find proteins for P01359 (Sus scrofa) Explore P01359  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		GLN

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Work: 0.200 
• R-Value Observed: 0.200 
• Space Group: I 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.7	α = 90
b = 72.6	β = 90
c = 181.5	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1994-04-30 
Deposition Author(s): Gajhede, M., Petersen, T.N., Henriksen, A., Petersen, J.F.W., Dauter, Z., Wilson, K.S., Thim, L.

Revision History  

• Version 1.0: 1994-04-30
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2017-11-29
  Changes: Derived calculations, Other
• Version 2.0: 2019-12-25
  Changes: Database references, Derived calculations, Polymer sequence