3R2P

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


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

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

  • 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 enigma ...

    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.


    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
MoleculeChainsSequence LengthOrganismDetails
Apolipoprotein A-I
A
185Homo sapiensMutation(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 = 108.333α = 90.00
b = 30.178β = 90.00
c = 69.576γ = 90.00
Software Package:
Software NamePurpose
PHENIXmodel building
HKL-2000data scaling
HKL-2000data reduction
MAR345dtbdata collection
PHENIXrefinement
PHENIXphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



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