3S4X

Crystal structure of the Asn152Gly mutant of P99 beta-lactamase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural analysis of the Asn152Gly mutant of P99 cephalosporinase.

Ruble, J.F.Lefurgy, S.T.Cornish, V.W.Powers, R.A.

(2012) Acta Crystallogr.,Sect.D 68: 1189-1193

  • DOI: 10.1107/S0907444912024080

  • PubMed Abstract: 
  • P99 cephalosporinase is a class C β-lactamase that is responsible in part for the widespread bacterial resistance to β-lactam antibiotics. Mutations of the conserved active-site residue Asn152 of the enzyme have been shown to alter β-lactam substrate ...

    P99 cephalosporinase is a class C β-lactamase that is responsible in part for the widespread bacterial resistance to β-lactam antibiotics. Mutations of the conserved active-site residue Asn152 of the enzyme have been shown to alter β-lactam substrate specificity in vivo. Mutation of Asn152 to a glycine is notable in that it exhibits in vivo substrate-selectivity switching. In order to better understand the structural basis for this observed switch, the X-ray crystal structure of the apo Asn152Gly mutant of P99 was determined to 1.95 Å resolution. Unexpectedly, the artificial C-terminal His(6) tag of a symmetrically-related molecule was observed bound in the active site. The His(6) tag makes several interactions with key active-site residues, as well as with several sulfate ions. Additionally, the overall C-terminus occupies the space left vacant upon the mutation of Asn152 to glycine.


    Organizational Affiliation

    Department of Chemistry, Grand Valley State University, Allendale, MI 49401, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Beta-lactamase
A
367Enterobacter cloacaeMutation(s): 4 
Gene Names: ampC
EC: 3.5.2.6
Find proteins for P05364 (Enterobacter cloacae)
Go to UniProtKB:  P05364
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.176 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 78.956α = 90.00
b = 85.481β = 90.00
c = 51.681γ = 90.00
Software Package:
Software NamePurpose
PHASERphasing
HKL-2000data reduction
HKL-2000data scaling
HKL-2000data collection
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-08-01
    Type: Initial release
  • Version 1.1: 2012-08-29
    Type: Database references
  • Version 1.2: 2013-01-23
    Type: Database references