3S3L

Crystal Structure of CerJ from Streptomyces tendae


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.162 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

A ketosynthase homolog uses malonyl units to form esters in cervimycin biosynthesis.

Bretschneider, T.Zocher, G.Unger, M.Scherlach, K.Stehle, T.Hertweck, C.

(2011) Nat.Chem.Biol. 8: 154-161

  • DOI: 10.1038/nchembio.746
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Ketosynthases produce the carbon backbones of a vast number of biologically active polyketides by catalyzing Claisen condensations of activated acyl and malonyl building blocks. Here we report that a ketosynthase homolog from Streptomyces tendae, Cer ...

    Ketosynthases produce the carbon backbones of a vast number of biologically active polyketides by catalyzing Claisen condensations of activated acyl and malonyl building blocks. Here we report that a ketosynthase homolog from Streptomyces tendae, CerJ, unexpectedly forms malonyl esters during the biosynthesis of cervimycin, a glycoside antibiotic against methicillin-resistant Staphylococcus aureus (MRSA). Deletion of cerJ yielded a substantially more active cervimycin variant lacking the malonyl side chain, and in vitro biotransformations revealed that CerJ is capable of transferring malonyl, methylmalonyl and dimethylmalonyl units onto the glycoside. According to phylogenetic analyses and elucidation of the crystal structure, CerJ is functionally and structurally positioned between the ketosynthase catalyzing Claisen condensations and acyl-ACP shuttles, and it features a noncanonical catalytic triad. Site-directed mutagenesis and structures of CerJ in complex with substrates not only allowed us to establish a model for the reaction mechanism but also provided insights into the evolution of this important subclass of the thiolase superfamily.


    Organizational Affiliation

    Leibniz Institute for Natural Product Research and Infection Biology, Jena, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CerJ
A, B
357Streptomyces tendaeMutation(s): 0 
Find proteins for H2L2M1 (Streptomyces tendae)
Go to UniProtKB:  H2L2M1
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ACT
Query on ACT

Download SDF File 
Download CCD File 
A, B
ACETATE ION
C2 H3 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-M
 Ligand Interaction
CL
Query on CL

Download SDF File 
Download CCD File 
A, B
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.162 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 105.410α = 90.00
b = 105.410β = 90.00
c = 120.920γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
XSCALEdata scaling
SHELXDphasing
REFMACrefinement
SHARPphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-21
    Type: Initial release
  • Version 1.1: 2012-01-11
    Type: Database references
  • Version 1.2: 2012-02-01
    Type: Database references
  • Version 1.3: 2017-11-08
    Type: Refinement description