Biological Assembly 1  

 3D View: Structure | Electron Density

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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: 21656.23 
• Atom Count: 1485 
• Residue Count: 185 
• Unique protein chains: 1

3R2P

2.2 Angstrom Crystal Structure of C Terminal Truncated Human Apolipoprotein A-I Reveals the Assembly of HDL by Dimerization.

• DOI: 10.2210/pdb3R2P/pdb

• Classification: LIPID TRANSPORT
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 2011-03-14 Released: 2011-09-21 
• Deposition Author(s): Mei, X., Atkinson, D.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2045 Å
• R-Value Free: 0.280 
• R-Value Work: 0.230 

Literature

Crystal Structure of C-terminal Truncated Apolipoprotein A-I Reveals the Assembly of High Density Lipoprotein (HDL) by Dimerization.

Mei, X., Atkinson, D.

(2011) J.Biol.Chem. 286: 38570-38582

• PubMed: 21914797 
• DOI: 10.1074/jbc.M111.260422


• PubMed Abstract: 
  

Apolipoprotein A-I (apoA-I) plays important structural and functional roles in plasma high density lipoprotein (HDL) that is responsible for reverse cholesterol transport. However, a molecular understanding of HDL assembly and function remains enigmatic. The 2.2-Å crystal structure of Δ(185-243)apoA-I reported here shows that it forms a half-circle dimer. The backbone of the dimer consists of two elongated antiparallel proline-kinked helices (five AB tandem repeats). The N-terminal domain of each molecule forms a four-helix bundle with the helical C-terminal region of the symmetry-related partner. The central region forms a flexible domain with two antiparallel helices connecting the bundles at each end. The two-domain dimer structure based on helical repeats suggests the role of apoA-I in the formation of discoidal HDL particles. Furthermore, the structure suggests the possible interaction with lecithin-cholesterol acyltransferase and may shed light on the molecular details of the effect of the Milano, Paris, and Fin mutations.

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Organizational Affiliation: 

Department of Physiology and Biophysics, Boston University School of Medicine, Boston, Massachusetts 02118, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
Apolipoprotein A-I	A	185	Homo sapiens	Mutation(s): 0  Gene Names: APOA1
Find proteins for P02647 (Homo sapiens) Go to Gene View: APOA1 Go to UniProtKB:  P02647

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2045 Å
• R-Value Free: 0.280 
• R-Value Work: 0.230 
• Space Group: P 2₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 108.333	α = 90.00
b = 30.178	β = 90.00
c = 69.576	γ = 90.00

Software Package:

Software Name	Purpose
PHENIX	model building
HKL-2000	data scaling
HKL-2000	data reduction
MAR345dtb	data collection
PHENIX	refinement
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-03-14 
• Released Date: 2011-09-21 
• Deposition Author(s): Mei, X., Atkinson, D.

Revision History 

• Version 1.0: 2011-09-21
  Type: Initial release
• Version 1.1: 2011-09-28
  Type: Database references, Structure summary
• Version 1.2: 2011-11-16
  Type: Database references