2PTD

PHOSPHATIDYLINOSITOL-SPECIFIC PHOSPHOLIPASE C MUTANT D198E


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.198 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Probing the roles of active site residues in phosphatidylinositol-specific phospholipase C from Bacillus cereus by site-directed mutagenesis.

Gassler, C.S.Ryan, M.Liu, T.Griffith, O.H.Heinz, D.W.

(1997) Biochemistry 36: 12802-12813

  • DOI: 10.1021/bi971102d
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • The role of amino acid residues located in the active site pocket of phosphatidylinositol-specific phospholipase C (PI-PLC) from Bacillus cereus[Heinz, D. W., Ryan, M., Bullock, T., & Griffith, O. H. (1995) EMBO J. 14, 3855-3863] was investigated by ...

    The role of amino acid residues located in the active site pocket of phosphatidylinositol-specific phospholipase C (PI-PLC) from Bacillus cereus[Heinz, D. W., Ryan, M., Bullock, T., & Griffith, O. H. (1995) EMBO J. 14, 3855-3863] was investigated by site-directed mutagenesis, kinetics, and crystal structure analysis. Twelve residues involved in catalysis and substrate binding (His32, Arg69, His82, Gly83, Lys115, Glu117, Arg163, Trp178, Asp180, Asp198, Tyr200, and Asp274) were individually replaced by 1-3 other amino acids, resulting in a total number of 21 mutants. Replacements in the mutants H32A, H32L, R69A, R69E, R69K, H82A, H82L, E117K, R163I, D198A, D198E, D198S, Y200S, and D274S caused essentially complete inactivation of the enzyme. The remaining mutants (G83S, K115E, R163K, W178Y, D180S, Y200F, and D274N) exhibited reduced activities up to 57% when compared with wild-type PI-PLC. Crystal structures determined at a resolution ranging from 2.0 to 2.7 A for six mutants (H32A, H32L, R163K, D198E, D274N, and D274S) showed that significant changes were confined to the site of the respective mutation without perturbation of the rest of the structure. Only in mutant D198E do the side chains of two neighboring arginine residues move across the inositol binding pocket toward the newly introduced glutamic acid. An analysis of these structure-function relationships provides new insight into the catalytic mechanism, and suggests a molecular explanation of some of the substrate stereospecificity and inhibitor binding data available for this enzyme.


    Related Citations: 
    • Crystal Structure of the Phosphatidylinositol-Specific Phospholipase C from Bacillus Cereus in Complex with Myo-Inositol
      Heinz, D.W.,Ryan, M.,Bullock, T.L.,Griffith, O.H.
      (1995) Embo J. 14: 3855


    Organizational Affiliation

    Institut für Organische Chemie und Biochemie, Universität Freiburg, D-79104 Freiburg, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PHOSPHATIDYLINOSITOL-SPECIFIC PHOSPHOLIPASE C
A
298Bacillus cereusMutation(s): 1 
EC: 4.6.1.13
Find proteins for P14262 (Bacillus cereus)
Go to UniProtKB:  P14262
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.271 
  • R-Value Work: 0.198 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 45.600α = 90.00
b = 45.900β = 90.00
c = 161.700γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
X-PLORrefinement
X-PLORphasing
XSCALEdata scaling
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1997-07-16 
  • Released Date: 1998-01-21 
  • Deposition Author(s): Heinz, D.W.

Revision History 

  • Version 1.0: 1998-01-21
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance