1I0A

CRYSTAL STRUCTURE OF WILD TYPE TURKEY DELTA 1 CRYSTALLIN (EYE LENS PROTEIN)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.156 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural studies of duck delta 1 and delta 2 crystallin suggest conformational changes occur during catalysis.

Sampaleanu, L.M.Vallee, F.Slingsby, C.Howell, P.L.

(2001) Biochemistry 40: 2732-2742

  • Primary Citation of Related Structures:  1HY0, 1HY1

  • PubMed Abstract: 
  • Duck delta1 and delta2 crystallin are 94% identical in amino acid sequence, and while delta2 crystallin is the duck orthologue of argininosuccinate lyase (ASL) and catalyzes the reversible breakdown of argininosuccinate to arginine and fumarate, the ...

    Duck delta1 and delta2 crystallin are 94% identical in amino acid sequence, and while delta2 crystallin is the duck orthologue of argininosuccinate lyase (ASL) and catalyzes the reversible breakdown of argininosuccinate to arginine and fumarate, the delta1 isoform is enzymatically inactive. The crystal structures of wild type duck delta1 and delta2 crystallin have been solved at 2.2 and 2.3 A resolution, respectively, and the refinement of the turkey delta1 crystallin has been completed. These structures have been compared with two mutant duck delta2 crystallin structures. Conformational changes were observed in two regions of the N-terminal domain with intraspecies differences between the active and inactive isoforms localized to residues 23-32 and both intra- and interspecies differences localized to the loop of residues 74-89. As the residues implicated in the catalytic mechanism of delta2/ASL are all conserved in delta1, the amino acid substitutions in these two regions are hypothesized to be critical for substrate binding. A sulfate anion was found in the active site of duck delta1 crystallin. This anion, which appears to mimic the fumarate moiety of the argininosuccinate substrate, induces a rigid body movement in domain 3 and a conformational change in the loop of residues 280-290, which together would sequester the substrate from the solvent. The duck delta1 crystallin structure suggests that Ser 281, a residue strictly conserved in all members of the superfamily, could be the catalytic acid in the delta2 crystallin/ASL enzymatic mechanism.


    Related Citations: 
    • The structure of avian eye lens delta-crystallin reveals a new fold for a superfamily of oligomeric enzymes
      Simpson, A.,Bateman, O.,Driessen, H.,Lindley, P.,Moss, D.,Mylvaganam, S.,Narebor, E.,Slingsby, C.
      (1994) Nat.Struct.Mol.Biol. 10: 724


    Organizational Affiliation

    Structural Biology and Biochemistry, Research Institute, Hospital for Sick Children, 555 University Avenue, Toronto, Ontario M5G 1X8, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DELTA CRYSTALLIN I
A, B, C, D
466Meleagris gallopavoGene Names: ASL1
Find proteins for Q7SIE0 (Meleagris gallopavo)
Go to UniProtKB:  Q7SIE0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.213 
  • R-Value Work: 0.156 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 89.420α = 90.00
b = 146.550β = 90.00
c = 152.899γ = 90.00
Software Package:
Software NamePurpose
MOSFLMdata reduction
CNSrefinement
CCP4data scaling
MLPHAREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-04-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance