Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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: 63.33 kDa 
• Atom Count: 3969 
• Residue Count: 480 
• Unique protein chains: 1

3S84

Dimeric apoA-IV

• DOI: 10.2210/pdb3S84/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Homo sapiens
• Expression System: Escherichia coli
• Mutation(s): No 


• 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: 2.40 Å
• R-Value Free: 0.229 
• R-Value Work: 0.200 
• R-Value Observed: 0.202 

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
• Primary Citation of Related Structures:  
  3S84


• 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

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Apolipoprotein A-IV	A, B	273	Homo sapiens	Mutation(s): 0  Gene Names: APOA4
Find proteins for P06727 (Homo sapiens) Explore P06727  Go to UniProtKB:  P06727
NIH Common Fund Data Resources
PHAROS  P06727 GTEx  ENSG00000110244

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.229 
• R-Value Work: 0.200 
• R-Value Observed: 0.202 
• Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 70.825	α = 90
b = 70.825	β = 90
c = 512.383	γ = 120

Software Package:

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

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
  Changes: Database references
• Version 1.2: 2017-11-08
  Changes: Advisory, Refinement description