1JGT

CRYSTAL STRUCTURE OF BETA-LACTAM SYNTHETASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 
    0.228 (Depositor), 0.220 (DCC) 
  • R-Value Work: 
    0.195 (Depositor), 0.190 (DCC) 
  • R-Value Observed: 
    0.194 (Depositor) 

wwPDB Validation   3D Report Full Report


Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted APCClick on this verticalbar to view detailsBest fitted CMAClick on this verticalbar to view details

This is version 1.4 of the entry. See complete history


Literature

Structure of beta-lactam synthetase reveals how to synthesize antibiotics instead of asparagine.

Miller, M.T.Bachmann, B.O.Townsend, C.A.Rosenzweig, A.C.

(2001) Nat Struct Biol 8: 684-689

  • DOI: https://doi.org/10.1038/90394
  • Primary Citation of Related Structures:  
    1JGT

  • PubMed Abstract: 

    The enzyme beta-lactam synthetase (beta-LS) catalyzes the formation of the beta-lactam ring in clavulanic acid, a clinically important beta-lactamase inhibitor. Whereas the penicillin beta-lactam ring is generated by isopenicillin N synthase (IPNS) in the presence of ferrous ion and dioxygen, beta-LS uses ATP and Mg2+ as cofactors. According to sequence alignments, beta-LS is homologous to class B asparagine synthetases (AS-Bs), ATP/Mg2+-dependent enzymes that convert aspartic acid to asparagine. Here we report the first crystal structure of a beta-LS. The 1.95 A resolution structure of Streptomyces clavuligerus beta-LS provides a fully resolved view of the active site in which substrate, closely related ATP analog alpha,beta-methyleneadenosine 5'-triphosphate (AMP-CPP) and a single Mg2+ ion are present. A high degree of substrate preorganization is observed. Comparison to Escherichia coli AS-B reveals the evolutionary changes that have taken place in beta-LS that impede interdomain reaction, which is essential in AS-B, and that accommodate beta-lactam formation. The structural data provide the opportunity to alter the synthetic potential of beta-LS, perhaps leading to the creation of new beta-lactamase inhibitors and beta-lactam antibiotics.


  • Organizational Affiliation

    Department of Biochemistry, Northwestern University, Evanston, Illinois 60208, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BETA-LACTAM SYNTHETASE
A, B
513Streptomyces clavuligerusMutation(s): 0 
Gene Names: 1901
EC: 6.3.3.4
UniProt
Find proteins for P0DJQ7 (Streptomyces clavuligerus)
Explore P0DJQ7 
Go to UniProtKB:  P0DJQ7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0DJQ7
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
APC
Query on APC

Download Ideal Coordinates CCD File 
D [auth A],
G [auth B]
DIPHOSPHOMETHYLPHOSPHONIC ACID ADENOSYL ESTER
C11 H18 N5 O12 P3
CAWZRIXWFRFUQB-IOSLPCCCSA-N
CMA
Query on CMA

Download Ideal Coordinates CCD File 
E [auth A],
H [auth B]
N2-(CARBOXYETHYL)-L-ARGININE
C9 H18 N4 O4
OHWCFZJEIHZWMN-LURJTMIESA-N
GOL
Query on GOL

Download Ideal Coordinates CCD File 
I [auth B],
J [auth B],
K [auth B],
L [auth B],
M [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
MG
Query on MG

Download Ideal Coordinates CCD File 
C [auth A],
F [auth B]
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free:  0.228 (Depositor), 0.220 (DCC) 
  • R-Value Work:  0.195 (Depositor), 0.190 (DCC) 
  • R-Value Observed: 0.194 (Depositor) 
Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.352α = 90
b = 97.873β = 90.78
c = 80.969γ = 90
Software Package:
Software NamePurpose
CNSrefinement
MAR345data collection
SCALEPACKdata scaling
CNSphasing

Structure Validation

View Full Validation Report



Ligand Structure Quality Assessment 

Created with Raphaël 2.3.0Worse 01 BetterLigand structure goodness of fit to experimental dataBest fitted APCClick on this verticalbar to view detailsBest fitted CMAClick on this verticalbar to view details

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-12-28
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.3: 2017-10-04
    Changes: Refinement description
  • Version 1.4: 2024-02-07
    Changes: Data collection, Database references, Derived calculations