1A6P | pdb_00001a6p

ENGINEERING OF A MISFOLDED FORM OF CD2

• PDB DOI: https://doi.org/10.2210/pdb1A6P/pdb

• Classification: CELL ADHESION
• Organism(s): Rattus norvegicus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1998-02-26 Released: 1998-06-17 
• Deposition Author(s): Murray, A.J., Head, J.G., Barker, J.J., Brady, R.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.08 Å
• R-Value Free: 
  0.296 (Depositor), 0.297 (DCC) 
• R-Value Work: 
  0.219 (Depositor), 0.220 (DCC) 
• R-Value Observed: 
  0.219 (Depositor) 

Starting Model: experimental

Literature

Engineering an intertwined form of CD2 for stability and assembly.

Murray, A.J., Head, J.G., Barker, J.J., Brady, R.L.

(1998) Nat Struct Biol 5: 778-782

• PubMed: 9731771 
• DOI: https://doi.org/10.1038/1816
• Primary Citation Related Structures: 
  1A64, 1A6P, 1A7B


• PubMed Abstract: 
  

  The amino-terminal domain of CD2 has the remarkable ability to fold in two ways: either as a monomer or as an intertwined, metastable dimer. Here we show that it is possible to differentially stabilize either fold by engineering the CD2 sequence, mimicking random mutagenesis events that could occur during molecular evolution. Crystal structures of a hinge-deletion mutant, which is stable as an intertwined dimer, reveal domain rotations that enable the protein to further assemble to a tetramer. These results demonstrate that a variety of folds can be adopted by a single polypeptide sequence, and provide guidance for the design of proteins capable of further assembly.

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Organizational Affiliation: 
• Department of Biochemistry and Centre for Molecular Recognition, University of Bristol, University Walk, UK.

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 21.08 kDa 
• Atom Count: 1,567 
• Modeled Residue Count: 188 
• Deposited Residue Count: 188 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
T-CELL SURFACE ANTIGEN CD2	A, B	94	Rattus norvegicus	Mutation(s): 0
UniProt
Find proteins for P08921 (Rattus norvegicus) Explore P08921  Go to UniProtKB:  P08921

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.08 Å
• R-Value Free:  0.296 (Depositor), 0.297 (DCC) 
• R-Value Work:  0.219 (Depositor), 0.220 (DCC) 
• R-Value Observed: 0.219 (Depositor) 

Space Group: P 4₃

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 41.09	α = 90
b = 41.09	β = 90
c = 105.92	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
DENZO	data reduction
SCALEPACK	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-06-17 
Deposition Author(s): Murray, A.J., Head, J.G., Barker, J.J., Brady, R.L.

Revision History  

• Version 1.0: 1998-06-17
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2023-08-02
  Changes: Database references, Other, Refinement description
• Version 1.4: 2024-05-22
  Changes: Data collection