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 U S A 78: 4175-4179

  • DOI: 10.1073/pnas.78.7.4175
  • Primary Citation of Related Structures:  
    1PPT

  • 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 1.4-A resolution by using a modified tangent formula ...

    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: 
    • 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
    • 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) Кристаллография 27: 97
    • 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
    • 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

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AVIAN PANCREATIC POLYPEPTIDE A36Meleagris gallopavoMutation(s): 0 
Gene Names: PPY
Find proteins for P68249 (Meleagris gallopavo)
Explore P68249 
Go to UniProtKB:  P68249
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download Ideal Coordinates 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 = 34.18α = 90
b = 32.92β = 105.26
c = 28.4γ = 90
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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