Biological Assembly 1  

 3D View: Structure

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 21.05 kDa 
• Atom Count: 1448 
• Residue Count: 168 
• Unique protein chains: 1

1YA9

Crystal Structure of the 22kDa N-Terminal Fragment of Mouse Apolipoprotein E

• DOI: 10.2210/pdb1YA9/pdb

• Classification: LIPID TRANSPORT
• Organism(s): Mus musculus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2004-12-17 Released: 2005-06-07 
• Deposition Author(s): Peters-Libeu, C.A., Rutenber, E., Newhouse, Y., Hatters, D.M., Weisgraber, K.H.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.09 Å
• R-Value Free: 0.224 
• R-Value Work: 0.215 
• R-Value Observed: 0.215 

Literature

Engineering conformational destabilization into mouse apolipoprotein E. A model for a unique property of human apolipoprotein E4

Hatters, D.M., Peters-Libeu, C.A., Weisgraber, K.H.

(2005) J Biol Chem 280: 26477-26482

• PubMed: 15890642 
• DOI: 10.1074/jbc.M503910200
• Primary Citation of Related Structures:  
  1YA9


• PubMed Abstract: 
  

Apolipoprotein (apo) E4 is a major risk factor for Alzheimer and cardiovascular diseases. ApoE4 differs from the two other common isoforms (apoE2 and apoE3) by its lower resistance to denaturation and greater propensity to form partially folded intermediates. As a first step to determine the importance of stability differences in vivo, we reengineered a partially humanized variant of the amino-terminal domain of mouse apoE (T61R mouse apoE) to acquire a destabilized conformation like that of apoE4. For this process, we determined the crystal structure of wild-type mouse apoE, which, like apoE4, forms a four-helix bundle, and identified two structural differences in the turn between helices 2 and 3 and in the middle of helix 3 as potentially destabilizing sites. Introducing mutations G83T and N113G at these sites destabilized the mouse apoE conformation. The mutant mouse apoE more rapidly remodeled phospholipid than T61R mouse apoE, which supports the hypothesis that a destabilized conformation promotes apoE4 lipid binding.

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Organizational Affiliation: 

Gladstone Institute of Neurological Disease, San Francisco, California 94158, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Apolipoprotein E	A	181	Mus musculus	Mutation(s): 0  Gene Names: Apoe
Find proteins for P08226 (Mus musculus) Explore P08226  Go to UniProtKB:  P08226
NIH Common Fund Data Resources
IMPC:  MGI:88057

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.09 Å
• R-Value Free: 0.224 
• R-Value Work: 0.215 
• R-Value Observed: 0.215 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 29.034	α = 90
b = 49.233	β = 90
c = 112.177	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
CCP4	data scaling
EPMR	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-12-17 
• Released Date: 2005-06-07 
Deposition Author(s): Peters-Libeu, C.A., Rutenber, E., Newhouse, Y., Hatters, D.M., Weisgraber, K.H.

Revision History 

• Version 1.0: 2005-06-07
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2019-07-24
  Changes: Data collection, Refinement description