1I5I

THE C18S MUTANT OF BOVINE (GAMMA-B)-CRYSTALLIN


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.223 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Enhanced crystallization of the Cys18 to Ser mutant of bovine gammaB crystallin.

Asherie, N.Pande, J.Pande, A.Zarutskie, J.A.Lomakin, J.Lomakin, A.Ogun, O.Stern, L.J.King, J.Benedek, G.B.

(2001) J.Mol.Biol. 314: 663-669

  • DOI: 10.1006/jmbi.2001.5155

  • PubMed Abstract: 
  • The cysteine residues of the gamma crystallins, a family of ocular lens proteins, are involved in the aggregation and phase separation of these proteins. Both these phenomena are implicated in cataract formation. We have used bovine gammaB crystallin ...

    The cysteine residues of the gamma crystallins, a family of ocular lens proteins, are involved in the aggregation and phase separation of these proteins. Both these phenomena are implicated in cataract formation. We have used bovine gammaB crystallin as a model system to study the role of the individual cysteine residues in the aggregation and phase separation of the gamma crystallins. Here, we compare the thermodynamic and kinetic behavior of the recombinant wild-type protein (WT) and the Cys18 to Ser (C18S) mutant. We find that the solubilities of the two proteins are similar. The kinetics of crystallization, however, are different. The WT crystallizes slowly enough for the metastable liquid-liquid coexistence to be easily observed. C18S, on the other hand, crystallizes rapidly; the metastable coexisting liquid phases of the pure mutant do not form. Nevertheless, the coexistence curve of C18S can be determined provided that crystallization is kinetically suppressed. In this way we found that the coexistence curve coincides with that of the WT. Despite the difference in the kinetics of crystallization, the two proteins were found to have the same crystal forms and almost identical X-ray structures. Our results demonstrate that even conservative point mutations can bring about dramatic changes in the kinetics of crystallization. The implications of our findings for cataract formation and protein crystallization are discussed.


    Related Citations: 
    • X-ray analysis of the eye lens protein Gamma-II Crystallin at 1.9 Angstrom Resolution
      Wistow, G.,Turnell, B.,Summers, L.,Slingsby, C.,Moss, D.,Miller, L.,Lindley, P.,Blundell, T.
      (1983) J.Mol.Biol. 170: 175
    • The molecular structure and stability of the eye lens: X-Ray Analysis of Gamma-Crystallin II
      Blundell, T.,Lindley, P.,Miller, L.,Moss, D.,Slingsby, C.,Tickle, I.,Turnell, B.,Wistow, G.
      (1981) Nature 289: 771
    • X-Ray Studies of the Lens Specific Proteins, the Crystallins
      Summers, L.,Wistow, G.,Narebor, M.,Moss, D.,Lindley, P.,Slingsby, C.,Blundell, T.,Bartunik, H.,Bartels, K.
      (1984) Pept.Protein Rev. 3: 147
    • Structure of the Bovine Eye Lens Protein Gamma-B (Gamma-II)-Crystallin at 1.47 Angstroms
      Najmudin, S.,Nalini, V.,Driessen, H.P.C.,Slingsby, C.,Blundell, T.L.,Moss, D.S.,Lindley, P.F.
      (1993) Acta Crystallogr.,Sect.D 49: 223


    Organizational Affiliation

    Department of Physics, Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge 02139-4307, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
(GAMMA-B) CRYSTALLIN
A
174Bos taurusGene Names: CRYGB
Find proteins for P02526 (Bos taurus)
Go to Gene View: CRYGB
Go to UniProtKB:  P02526
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.223 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 57.850α = 90.00
b = 57.850β = 90.00
c = 98.710γ = 90.00
Software Package:
Software NamePurpose
X-PLORrefinement
DENZOdata reduction
AMoREphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-07
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance