Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 18.41 kDa 
• Atom Count: 1293 
• Modelled Residue Count: 166 
• Deposited Residue Count: 166 
• Unique protein chains: 1

1EQ1

NMR STRUCTURE OF AN EXCHANGEABLE APOLIPOPROTEIN-MANDUCA SEXTA APOLIPOPHORIN-III

• PDB DOI: 10.2210/pdb1EQ1/pdb

• Classification: LIPID BINDING PROTEIN
• Organism(s): Manduca sexta
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2000-03-31 Released: 2002-02-13 
• Deposition Author(s): Wang, J., Sykes, B.D., Ryan, R.O.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 25 
• Selection Criteria: structures with acceptable covalent geometry, structures with favorable non-bond energy, structures with the least restraint violations, structures with the lowest energy, target function 

Literature

Structural basis for the conformational adaptability of apolipophorin III, a helix-bundle exchangeable apolipoprotein

Wang, J., Sykes, B.D., Ryan, R.O.

(2002) Proc Natl Acad Sci U S A 99: 1188-1193

• PubMed: 11818551 
• DOI: 10.1073/pnas.032565999
• Primary Citation of Related Structures:  
  1EQ1


• PubMed Abstract: 
  

The high-resolution NMR structure of apolipophorin III from the sphinx moth, Manduca sexta, has been determined in the lipid-free state. We show that lipid-free apolipophorin III adopts a unique helix-bundle topology that has several characteristic structural features. These include a marginally stable, up-and-down helix bundle that allows for concerted opening of the bundle about "hinged" loops upon lipid interaction and buried polar/ionizable residues and buried interhelical H-bonds located in the otherwise hydrophobic interior of the bundle that adjust protein stability and facilitate lipid-induced conformational opening. We suggest that these structural features modulate the conformational adaptability of the lipid-free helix bundle upon lipid binding and control return of the open conformation to the original lipid-free helix-bundle state. Taken together, these data provide a structural rationale for the ability of exchangeable apolipoproteins to reversibly interact with circulating lipoprotein particles.

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Related Citations: 

• Insight into Lipid Surface Recognition and Reversible Conformational Adaptation of an Exchangeable Apolipoprotein by Multidimensional Heteronuclear NMR Techniques
  Wang, J., Gagne, S.M., Sykes, B.D., Ryan, R.O.
  (1997) J Biol Chem 272: 17912

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Organizational Affiliation: 

Department of Biochemistry and Molecular Biology, School of Medicine, Southern Illinois University, Carbondale, IL 62901-4413, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
APOLIPOPHORIN-III	A	166	Manduca sexta	Mutation(s): 0
UniProt
Find proteins for P13276 (Manduca sexta) Explore P13276  Go to UniProtKB:  P13276

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 40 
• Conformers Submitted: 25 
• Selection Criteria: structures with acceptable covalent geometry, structures with favorable non-bond energy, structures with the least restraint violations, structures with the lowest energy, target function 
• OLDERADO: 1EQ1 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-03-31 
• Released Date: 2002-02-13 
Deposition Author(s): Wang, J., Sykes, B.D., Ryan, R.O.

Revision History  

• Version 1.0: 2002-02-13
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2022-02-16
  Changes: Database references, Derived calculations