Experimental Data Snapshot

  • Resolution: 2.70 Å
  • R-Value Observed: 0.210 

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This is version 1.3 of the entry. See complete history


Molecular structure of an apolipoprotein determined at 2.5-A resolution.

Breiter, D.R.Kanost, M.R.Benning, M.M.Wesenberg, G.Law, J.H.Wells, M.A.Rayment, I.Holden, H.M.

(1991) Biochemistry 30: 603-608

  • DOI: https://doi.org/10.1021/bi00217a002
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The three-dimensional structure of an apolipoprotein isolated from the African migratory locust Locusta migratoria has been determined by X-ray analysis to a resolution of 2.5 A. The overall molecular architecture of this protein consists of five long alpha-helices connected by short loops. As predicted from amino acid sequence analyses, these helices are distinctly amphiphilic with the hydrophobic residues pointing in toward the interior of the protein and the hydrophilic side chains facing outward. The molecule falls into the general category of up-and-down alpha-helical bundles as previously observed, for example, in cytochrome c'. Although the structure shows the presence of five long amphiphilic alpha-helices, the alpha-helical moment and hydrophobicity of the entire molecule fall into the range found for normal globular proteins. Thus, in order for the amphiphilic helices to play a role in the binding of the protein to a lipid surface, there must be a structural reorganization of the protein which exposes the hydrophobic interior to the lipid surface. The three-dimensional motif of this apolipoprotein is compatible with a model in which the molecule binds to the lipid surface via a relatively nonpolar end and then spreads on the surface in such a way as to cause the hydrophobic side chains of the helices to come in contact with the lipid surface, the charged and polar residues to remain in contact with water, and the overall helical motif of the protein to be maintained.

  • Organizational Affiliation

    Department of Chemistry, University of Wisconsin, Madison 53705.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
APOLIPOPHORIN III161Locusta migratoriaMutation(s): 0 
Find proteins for P10762 (Locusta migratoria)
Explore P10762 
Go to UniProtKB:  P10762
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP10762
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • R-Value Observed: 0.210 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 67.5α = 90
b = 67.5β = 90
c = 155.6γ = 120
Software Package:
Software NamePurpose

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

  • Released Date: 1994-01-31 
  • Deposition Author(s): Holden, H.

Revision History  (Full details and data files)

  • Version 1.0: 1994-01-31
    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: 2024-02-07
    Changes: Data collection, Database references, Other