Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 63330.95 
• Atom Count: 3947 
• Residue Count: 546 
• Unique protein chains: 1

3S84

Dimeric apoA-IV

• DOI: 10.2210/pdb3S84/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2011-05-27 Released: 2012-05-16 
• Deposition Author(s): Deng, X., Davidson, W.S., Thompson, T.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.229 
• R-Value Work: 0.200 

Literature

The Structure of Dimeric Apolipoprotein A-IV and Its Mechanism of Self-Association.

Deng, X., Morris, J., Dressmen, J., Tubb, M.R., Tso, P., Jerome, W.G., Davidson, W.S., Thompson, T.B.

(2012) Structure 20: 767-779

• PubMed: 22579246 
• DOI: 10.1016/j.str.2012.02.020


• PubMed Abstract: 
  

Apolipoproteins are key structural elements of lipoproteins and critical mediators of lipid metabolism. Their detergent-like properties allow them to emulsify lipid or exist in a soluble lipid-free form in various states of self-association. Unfortunately, these traits have hampered high-resolution structural studies needed to understand the biogenesis of cardioprotective high-density lipoproteins (HDLs). We derived a crystal structure of the core domain of human apolipoprotein (apo)A-IV, an HDL component and important mediator of lipid absorption. The structure at 2.4 Å depicts two linearly connected 4-helix bundles participating in a helix swapping arrangement that offers a clear explanation for how the protein self-associates as well as clues to the structure of its monomeric form. This also provides a logical basis for antiparallel arrangements recently described for lipid-containing particles. Furthermore, we propose a "swinging door" model for apoA-IV lipid association.

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Organizational Affiliation: 

Department of Molecular Genetics, Biochemistry, and Microbiology, College of Medicine, University of Cincinnati, OH 45267, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Apolipoprotein A-IV	A, B	273	Homo sapiens	Mutation(s): 0  Gene Names: APOA4
Find proteins for P06727 (Homo sapiens) Go to Gene View: APOA4 Go to UniProtKB:  P06727

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
SO4	B	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.4 Å
• R-Value Free: 0.229 
• R-Value Work: 0.200 
• Space Group: P 6₁ 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 70.825	α = 90.00
b = 70.825	β = 90.00
c = 512.383	γ = 120.00

Software Package:

Software Name	Purpose
CRANK	phasing
Blu-Ice	data collection
BUSTER	refinement
XDS	data scaling
XDS	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-05-27 
• Released Date: 2012-05-16 
• Deposition Author(s): Deng, X., Davidson, W.S., Thompson, T.B.

Revision History 

• Version 1.0: 2012-05-16
  Type: Initial release
• Version 1.1: 2012-06-20
  Type: Database references
• Version 1.2: 2017-11-08
  Type: Advisory, Refinement description