1BLP

STRUCTURAL BASIS FOR THE INACTIVATION OF THE P54 MUTANT OF BETA-LACTAMASE FROM STAPHYLOCOCCUS AUREUS PC1


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for the inactivation of the P54 mutant of beta-lactamase from Staphylococcus aureus PC1.

Herzberg, O.Kapadia, G.Blanco, B.Smith, T.S.Coulson, A.

(1991) Biochemistry 30: 9503-9509


  • PubMed Abstract: 
  • The crystal structure of a mutant protein of a class A beta-lactamase from Staphylococcus aureus PC1, in which Asp179 is replaced by an asparagine (P54), has been determined and refined at 2.3-A resolution (1 A = 0.1 nm). The resulting crystallograph ...

    The crystal structure of a mutant protein of a class A beta-lactamase from Staphylococcus aureus PC1, in which Asp179 is replaced by an asparagine (P54), has been determined and refined at 2.3-A resolution (1 A = 0.1 nm). The resulting crystallographic R factor [formula: see text] are the observed and calculated structure factor amplitudes) is 0.181 for 12289 reflections with I greater than or equal to sigma (I) within the 6.0-2.3-A resolution range. The mutated residue is located at the C-terminus of an extensive loop (the omega-loop), remote from the active site, and results in a drastically reduced activity. Examination of the native and P54 structures reveals that the overall fold is similar, except that there is substantial disorder of the omega-loop of P54. This is a consequence of the elimination of a salt bridge between Asp179 and Arg164 that links the two ends of the omega-loop in native beta-lactamase. It is associated with a difference in side-chain conformation between Asn179 in P54 and Asp179 in the native structure. An alternate interaction occurs in P54 between Asn179 and Ala69, adjacent to the catalytic Ser70. This disorder affects catalysis since some of the disordered residues, in particular Glu166, form part of the active site.(ABSTRACT TRUNCATED AT 250 WORDS)


    Related Citations: 
    • Bacterial Resistance to Beta-Lactam Antibiotics. Crystal Structure of Beta-Lactamase from Staphylococcus Aureus Pc1 at 2.5 Angstroms Resolution
      Herzberg, O.,Moult, J.
      (1987) Science 236: 694
    • The Crystal Structure of Beta-Lactamase from Staphylococcus Aureus at 0.5Nm Resolution
      Moult, J.,Sawyer, L.,Herzberg, O.,Jones, C.L.,Coulson, A.F.W.,Green, D.W.,Harding, M.M.,Ambler, R.P.
      (1985) Biochem.J. 225: 167
    • Refined Crystal Structure of Beta-Lactamase from Staphylococcus Aureus Pc1 at 2.0
      Herzberg, O.
      (1991) J.Mol.Biol. 217: 701


    Organizational Affiliation

    Center for Advanced Research in Biotechnology, Maryland Biotechnology Institute, University of Maryland, Rockville 20850.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
BETA-LACTAMASE
A
257Staphylococcus aureusGene Names: blaZ
EC: 3.5.2.6
Find proteins for P00807 (Staphylococcus aureus)
Go to UniProtKB:  P00807
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 54.900α = 90.00
b = 96.000β = 90.00
c = 137.800γ = 90.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1993-09-23 
  • Released Date: 1994-04-30 
  • Deposition Author(s): Herzberg, O.

Revision History 

  • Version 1.0: 1994-04-30
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-11-23
    Type: Structure summary