1PIO

AN ENGINEERED STAPHYLOCOCCUS AUREUS PC1 BETA-LACTAMASE THAT HYDROLYSES THIRD GENERATION CEPHALOSPORINS

• PDB DOI: https://doi.org/10.2210/pdb1PIO/pdb

• Classification: HYDROLASE (ACTING ON CYCLIC AMIDES)
• Organism(s): Staphylococcus aureus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 1995-10-11 Released: 1996-03-08 
• Deposition Author(s): Zawadzke, L.E., Herzberg, O.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.189 
• R-Value Work: 0.189 
• R-Value Observed: 0.189 

Literature

An engineered Staphylococcus aureus PC1 beta-lactamase that hydrolyses third-generation cephalosporins.

Zawadzke, L.E., Smith, T.J., Herzberg, O.

(1995) Protein Eng 8: 1275-1285

• PubMed: 8869640 
• DOI: https://doi.org/10.1093/protein/8.12.1275
• Primary Citation of Related Structures:  
  1PIO


• PubMed Abstract: 
  

  The beta-lactamase from Staphylococcus aureus PC1 has been cloned into an Escherichia coli vector for site-directed mutagenesis and high-level protein expression. A mutant enzyme has been produced in which Ala238 is replaced by a serine, and Ile239 is deleted (A238S:I239del). The engineered enzyme hydrolyses third-generation cephalosporins substantially more rapidly than the parental enzyme does, while hydrolysis of benzylpenicillin is slower with the mutant than with the wild-type and native enzymes. The mutant beta-lactamase has been crystallized and the structure determined and refined at 2.8 A resolution. The disposition of the beta-strand which forms the side of the active site is altered in comparison with the native S. aureus beta-lactamase structure, widening the active site cleft and providing space to accommodate the bulky side-chains of the third-generation cephalosporins.

---

Organizational Affiliation: 

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

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 57.75 kDa 
• Atom Count: 4,153 
• Modelled Residue Count: 512 
• Deposited Residue Count: 514 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA-LACTAMASE	A, B	257	Staphylococcus aureus	Mutation(s): 1  Gene Names: BLAZ EC: 3.5.2.6
UniProt
Find proteins for P00807 (Staphylococcus aureus) Explore P00807  Go to UniProtKB:  P00807

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 0.189 
• R-Value Work: 0.189 
• R-Value Observed: 0.189 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54	α = 90
b = 67.6	β = 90
c = 141.4	γ = 90

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
XENGEN	data reduction
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1996-03-08 
Deposition Author(s): Zawadzke, L.E., Herzberg, O.

Revision History  

• Version 1.0: 1996-03-08
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2021-11-03
  Changes: Database references, Other
• Version 1.4: 2022-12-21
  Changes: Database references