1CHW

CHALCONE SYNTHASE FROM ALFALFA COMPLEXED WITH HEXANOYL-COA


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structure of chalcone synthase and the molecular basis of plant polyketide biosynthesis.

Ferrer, J.L.Jez, J.M.Bowman, M.E.Dixon, R.A.Noel, J.P.

(1999) Nat.Struct.Mol.Biol. 6: 775-784

  • DOI: 10.1038/11553
  • Primary Citation of Related Structures:  1BI5, 1BQ6, 1CGK, 1CGZ, 1CML

  • PubMed Abstract: 
  • Chalcone synthase (CHS) is pivotal for the biosynthesis of flavonoid antimicrobial phytoalexins and anthocyanin pigments in plants. It produces chalcone by condensing one p-coumaroyl- and three malonyl-coenzyme A thioesters into a polyketide reaction ...

    Chalcone synthase (CHS) is pivotal for the biosynthesis of flavonoid antimicrobial phytoalexins and anthocyanin pigments in plants. It produces chalcone by condensing one p-coumaroyl- and three malonyl-coenzyme A thioesters into a polyketide reaction intermediate that cyclizes. The crystal structures of CHS alone and complexed with substrate and product analogs reveal the active site architecture that defines the sequence and chemistry of multiple decarboxylation and condensation reactions and provides a molecular understanding of the cyclization reaction leading to chalcone synthesis. The structure of CHS complexed with resveratrol also suggests how stilbene synthase, a related enzyme, uses the same substrates and an alternate cyclization pathway to form resveratrol. By using the three-dimensional structure and the large database of CHS-like sequences, we can identify proteins likely to possess novel substrate and product specificity. The structure elucidates the chemical basis of plant polyketide biosynthesis and provides a framework for engineering CHS-like enzymes to produce new products.


    Organizational Affiliation

    Structural Biology Laboratory, The Salk Institute for Biological Studies, 10010 N. Torrey Pines Rd., La Jolla, California 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PROTEIN (CHALCONE SYNTHASE)
A, B
389Medicago sativaGene Names: CHS2
EC: 2.3.1.74
Find proteins for P30074 (Medicago sativa)
Go to UniProtKB:  P30074
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HXC
Query on HXC

Download SDF File 
Download CCD File 
A, B
HEXANOYL-COENZYME A
C27 H46 N7 O17 P3 S
OEXFMSFODMQEPE-HDRQGHTBSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.290 
  • R-Value Work: 0.213 
  • Space Group: P 31 2 1
Unit Cell:
Length (Å)Angle (°)
a = 97.814α = 90.00
b = 97.814β = 90.00
c = 130.463γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
CCP4phasing
SCALEPACKdata scaling
CCP4model building
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-08-18
    Type: Initial release
  • Version 1.1: 2007-10-16
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance