1KVL

X-ray Crystal Structure of AmpC S64G Mutant beta-Lactamase in Complex with Substrate and Product Forms of Cephalothin


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.195 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structural milestones in the reaction pathway of an amide hydrolase: substrate, acyl, and product complexes of cephalothin with AmpC beta-lactamase.

Beadle, B.M.Trehan, I.Focia, P.J.Shoichet, B.K.

(2002) Structure 10: 413-424

  • DOI: https://doi.org/10.1016/s0969-2126(02)00725-6
  • Primary Citation of Related Structures:  
    1KVL, 1KVM

  • PubMed Abstract: 

    Beta-lactamases hydrolyze beta-lactam antibiotics and are the leading cause of bacterial resistance to these drugs. Although beta-lactamases have been extensively studied, structures of the substrate-enzyme and product-enzyme complexes have proven elusive. Here, the structure of a mutant AmpC in complex with the beta-lactam cephalothin in its substrate and product forms was determined by X-ray crystallography to 1.53 A resolution. The acyl-enzyme intermediate between AmpC and cephalothin was determined to 2.06 A resolution. The ligand undergoes a dramatic conformational change as the reaction progresses, with the characteristic six-membered dihydrothiazine ring of cephalothin rotating by 109 degrees. These structures correspond to all three intermediates along the reaction path and provide insight into substrate recognition, catalysis, and product expulsion.


  • Organizational Affiliation

    Department of Molecular Pharmacology and Biological Chemistry, Northwestern University, Chicago, Illinois 60611, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Beta-lactamase
A, B
358Escherichia coliMutation(s): 1 
Gene Names: K12
EC: 3.5.2.6
UniProt
Find proteins for P00811 (Escherichia coli (strain K12))
Explore P00811 
Go to UniProtKB:  P00811
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP00811
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
CLS
Query on CLS

Download Ideal Coordinates CCD File 
F [auth A]CEPHALOTHIN
C16 H16 N2 O6 S2
XIURVHNZVLADCM-IUODEOHRSA-N
KCP
Query on KCP

Download Ideal Coordinates CCD File 
E [auth A]2-[CARBOXY-(2-THIOPHEN-2-YL-ACETYLAMINO)-METHYL]-5-METHYL-3,6-DIHYDRO-2H-[1,3]THIAZINE-4-CARBOXYLIC ACID
C14 H16 N2 O5 S2
JRYZEMHNDUZNMI-RYUDHWBXSA-N
THN
Query on THN

Download Ideal Coordinates CCD File 
G [auth B]2-[CARBOXY-(2-THIOPHEN-2-YL-ACETYLAMINO)-METHYL]-5-METHYLENE-5,6-DIHYDRO-2H-[1,3]THIAZINE-4-CARBOXYLIC ACID
C14 H14 N2 O5 S2
VBBNCGUNWSPHOY-QWRGUYRKSA-N
PO4
Query on PO4

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.53 Å
  • R-Value Free: 0.220 
  • R-Value Work: 0.195 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 118.619α = 90
b = 77.153β = 115.9
c = 98.066γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-03-13
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-10-27
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-08-16
    Changes: Data collection, Refinement description