4OJ8

Crystal structure of carbapenem synthase in complex with (3S,5S)-carbapenam


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Mechanism of the C5 stereoinversion reaction in the biosynthesis of carbapenem antibiotics.

Chang, W.C.Guo, Y.Wang, C.Butch, S.E.Rosenzweig, A.C.Boal, A.K.Krebs, C.Bollinger, J.M.

(2014) Science 343: 1140-1144

  • DOI: 10.1126/science.1248000
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The bicyclic β-lactam/2-pyrrolidine precursor to all carbapenem antibiotics is biosynthesized by attachment of a carboxymethylene unit to C5 of L-proline followed by β-lactam ring closure. Carbapenem synthase (CarC), an Fe(II) and 2-(oxo)glutarate (F ...

    The bicyclic β-lactam/2-pyrrolidine precursor to all carbapenem antibiotics is biosynthesized by attachment of a carboxymethylene unit to C5 of L-proline followed by β-lactam ring closure. Carbapenem synthase (CarC), an Fe(II) and 2-(oxo)glutarate (Fe/2OG)-dependent oxygenase, then inverts the C5 configuration. Here we report the structure of CarC in complex with its substrate and biophysical dissection of its reaction to reveal the stereoinversion mechanism. An Fe(IV)-oxo intermediate abstracts the hydrogen (H•) from C5, and tyrosine 165, a residue not visualized in the published structures of CarC lacking bound substrate, donates H• to the opposite face of the resultant radical. The reaction oxidizes the Fe(II) cofactor to Fe(III), limiting wild-type CarC to one turnover, but substitution of the H•-donating tyrosine disables stereoinversion and confers to CarC the capacity for catalytic substrate oxidation.


    Organizational Affiliation

    Department of Chemistry, The Pennsylvania State University, University Park, PA 16802, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
(5R)-carbapenem-3-carboxylate synthaseA, B, C293Pectobacterium carotovorum subsp. carotovorumMutation(s): 0 
Gene Names: carC
EC: 1.14.20.3
Find proteins for Q9XB59 (Pectobacterium carotovorum subsp. carotovorum)
Explore Q9XB59 
Go to UniProtKB:  Q9XB59
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
2TQ
Query on 2TQ

Download CCD File 
B, C
(2S,5S)-7-oxo-1-azabicyclo[3.2.0]heptane-2-carboxylic acid
C7 H9 N O3
RJPDELAUUYAFTQ-WHFBIAKZSA-N
 Ligand Interaction
AKG
Query on AKG

Download CCD File 
A, B, C
2-OXOGLUTARIC ACID
C5 H6 O5
KPGXRSRHYNQIFN-UHFFFAOYSA-N
 Ligand Interaction
GOL
Query on GOL

Download CCD File 
B
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
FE2
Query on FE2

Download CCD File 
A, B, C
FE (II) ION
Fe
CWYNVVGOOAEACU-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.236 
  • R-Value Work: 0.198 
  • R-Value Observed: 0.200 
  • Space Group: C 2 2 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.251α = 90
b = 165.778β = 90
c = 146.58γ = 90
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
PDB_EXTRACTdata extraction
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-04-02
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Refinement description