1KYZ

Crystal Structure Analysis of Caffeic acid/5-hydroxyferulic acid 3/5-O-methyltransferase Ferulic Acid Complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 

Starting Model: experimental
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Ligand Structure Quality Assessment 


This is version 1.4 of the entry. See complete history


Literature

Structural basis for the modulation of lignin monomer methylation by caffeic acid/5-hydroxyferulic acid 3/5-O-methyltransferase.

Zubieta, C.Kota, P.Ferrer, J.L.Dixon, R.A.Noel, J.P.

(2002) Plant Cell 14: 1265-1277

  • DOI: https://doi.org/10.1105/tpc.001412
  • Primary Citation of Related Structures:  
    1KYW, 1KYZ

  • PubMed Abstract: 

    Caffeic acid/5-hydroxyferulic acid 3/5-O-methyltransferase (COMT) from alfalfa is an S-adenosyl-L-Met-dependent O-methyltransferase involved in lignin biosynthesis. COMT methylates caffeoyl- and 5-hydroxyferuloyl-containing acids, aldehydes, and alcohols in vitro while displaying a kinetic preference for the alcohols and aldehydes over the free acids. The 2.2-A crystal structure of COMT in complex with S-adenosyl-L-homocysteine (SAH) and ferulic acid (ferulate form), as well as the 2.4-A crystal structure of COMT in complex with SAH and 5-hydroxyconiferaldehyde, provide a structural understanding of the observed substrate preferences. These crystal structures identify residues lining the active site surface that contact the substrates. Structurally guided site-directed mutagenesis of active site residues was performed with the goal of altering the kinetic preferences for physiological substrates. The kinetic parameters of the COMT mutants versus wild-type enzyme are presented, and coupled with the high-resolution crystal structures, they will serve as a starting point for the in vivo manipulation of lignin monomers in transgenic plants. Ultimately, this structurally based approach to metabolic engineering will allow the further alteration of the lignin biosynthetic pathway in agronomically important plants. This approach will lead to a better understanding of the in vivo operation of the potential metabolic grid for monolignol biosynthesis.


  • Organizational Affiliation

    Structural Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Caffeic acid 3-O-methyltransferaseA,
B [auth C],
C [auth E]
365Medicago sativaMutation(s): 0 
EC: 2.1.1.68
UniProt
Find proteins for P28002 (Medicago sativa)
Explore P28002 
Go to UniProtKB:  P28002
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP28002
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.274 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.236 
  • Space Group: P 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 103.729α = 90
b = 61.865β = 112.18
c = 111.229γ = 90
Software Package:
Software NamePurpose
CNSrefinement
DENZOdata reduction
SCALEPACKdata scaling
CNSphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2002-08-28
    Type: Initial release
  • Version 1.1: 2008-04-28
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2024-02-14
    Changes: Data collection, Database references, Derived calculations
  • Version 1.4: 2024-04-03
    Changes: Refinement description