3MJC

Structure of A-type Ketoreductases from Modular Polyketide Synthase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural and Functional Analysis of A-Type Ketoreductases from the Amphotericin Modular Polyketide Synthase.

Zheng, J.Taylor, C.A.Piasecki, S.K.Keatinge-Clay, A.T.

(2010) Structure 18: 913-922

  • DOI: 10.1016/j.str.2010.04.015
  • Primary Citation of Related Structures:  3MJE, 3MJS, 3MJT, 3MJV

  • PubMed Abstract: 
  • Complex polyketides are characterized by multiple chiral centers harboring hydroxyl and alkyl substituents. To investigate the mechanisms by which these stereocenters are set, several high-resolution structures of the ketoreductase (KR) domain from t ...

    Complex polyketides are characterized by multiple chiral centers harboring hydroxyl and alkyl substituents. To investigate the mechanisms by which these stereocenters are set, several high-resolution structures of the ketoreductase (KR) domain from the second module of the amphotericin modular polyketide synthase (PKS) were solved. This first structural analysis of an A-type KR helps reveal how these KRs direct polyketide intermediates into their active sites from the side opposite that used by B-type KRs, resulting in a beta-hydroxyl group of opposite stereochemistry. A comparison of structures obtained in the absence and presence of ligands reveals an induced fit mechanism that is important for catalysis. Activity assays of mutants of KRs from the first and second modules of the amphotericin PKS reveal the relative contributions of several active site residues toward catalysis and stereocontrol. Together, these results highlight the possibility of region-specific modification of polyketides through active site engineering of KRs.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, The University of Texas at Austin, Austin, TX 78712-0165, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AmphB
A, B
496Streptomyces nodosusGene Names: amphB
Find proteins for Q93NW7 (Streptomyces nodosus)
Go to UniProtKB:  Q93NW7
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download SDF File 
Download CCD File 
B
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.213 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 61.474α = 72.79
b = 63.746β = 67.30
c = 71.551γ = 89.82
Software Package:
Software NamePurpose
ADSCdata collection
HKL-2000data reduction
PHASESphasing
HKL-2000data scaling
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-08-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance