1PPT

X-RAY ANALYSIS (1.4-ANGSTROMS RESOLUTION) OF AVIAN PANCREATIC POLYPEPTIDE. SMALL GLOBULAR PROTEIN HORMONE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.37 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

X-ray analysis (1. 4-A resolution) of avian pancreatic polypeptide: Small globular protein hormone.

Blundell, T.L.Pitts, J.E.Tickle, I.J.Wood, S.P.Wu, C.W.

(1981) Proc.Natl.Acad.Sci.Usa 78: 4175-4179

  • DOI: 10.1073/pnas.78.7.4175
  • Also Cited By: 2BF9

  • PubMed Abstract: 
  • The crystal structure of avian pancreatic polypeptide (aPP), a 36-residue polypeptide with some hormonal properties, has been determined by using single isomorphous replacement and anomalous scattering to 2.1-A resolution. The phases were extended to ...

    The crystal structure of avian pancreatic polypeptide (aPP), a 36-residue polypeptide with some hormonal properties, has been determined by using single isomorphous replacement and anomalous scattering to 2.1-A resolution. The phases were extended to 1.4-A resolution by using a modified tangent formula. The molecule contains two regions of secondary structure-an extended polyproline-like helix (residues 1-8) and an alpha-helix (residues 14-31)-that run roughly antiparallel. The packing together of nonpolar groups from these regions gives the molecule a hydrophobic core in spite of its small size. The aPP molecules form a symmetrical dimer in the crystal stabilized principally by interlocking of nonpolar groups from the alpha-helices. The aPP dimers are crosslinked by coordination of Zn(2+); three aPP molecules contribute ligands to each zinc. The coordination geometry is a distorted trigonal bipyramid. The properties of the aPP molecule in solution are consistent with expectations based on the crystal structure. The aPP molecule has several general features in common with the pancreatic hormones insulin and glucagon. All three hormones have complex mechanisms for self-association. Like insulin, aPP seems to have a stable monomeric structure but its biological activity seems to depend on the more flexible COOH-terminal region analogous to the flexible NH(2)-terminal region of glucagon.


    Related Citations: 
    • Purification, Crystallisation and Preliminary X-Ray Studies on Avian Pancreatic Polypeptide
      Wood, S.P.,Pitts, J.E.,Blundell, T.L.,Tickle, I.J.,Jenkins, J.A.
      (1977) Eur.J.Biochem. 78: 119
    • Isolation and Characterization of a New Pancreatic Polypeptide Hormone
      Kimmel, J.R.,Hayden, L.J.,Pollock, H.G.
      (1975) J.Biol.Chem. 250: 9369
    • Crystal Structure Analysis of Avian Pancreatic Polypeptide at 1.37 Angstroms Resolution
      Pitts, J.E.,Tickle, I.J.,Wood, S.P.,Blundell, T.L.
      (1982) Sov.Phys.Crystallogr.(Engl.Transl.) 27: 56
    • Crystal Structure Analysis of Avian Pancreatic Polypeptide at 1.37 Angstroms Resolution
      Pitts, J.E.,Tickle, I.J.,Wood, S.P.,Blundell, T.L.
      (1982) Kristallografiya 27: 97
    • Conformational Flexibility in a Small Globular Hormone. X-Ray Analysis of Avian Pancreatic Polypeptide at 0.98-Angstroms Resolution
      Glover, I.,Haneef, I.,Pitts, J.,Wood, S.,Moss, D.,Tickle, I.,Blundell, T.
      (1983) Biopolymers 22: 293


    Organizational Affiliation

    Laboratory of Molecular Biology, Department of Crystallography, Birkbeck College, University of London, Malet Street, London WC1E 7HX England.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AVIAN PANCREATIC POLYPEPTIDE
A
36Meleagris gallopavoMutation(s): 0 
Gene Names: PPY
Find proteins for P68249 (Meleagris gallopavo)
Go to Gene View: PPY
Go to UniProtKB:  P68249
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.37 Å
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 34.180α = 90.00
b = 32.920β = 105.26
c = 28.400γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1981-02-19
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance