4R1T

Crystal structure of Petunia hydrida cinnamoyl-CoA reductase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural Studies of Cinnamoyl-CoA Reductase and Cinnamyl-Alcohol Dehydrogenase, Key Enzymes of Monolignol Biosynthesis.

Pan, H.Zhou, R.Louie, G.V.Muhlemann, J.K.Bomati, E.K.Bowman, M.E.Dudareva, N.Dixon, R.A.Noel, J.P.Wang, X.

(2014) Plant Cell 26: 3709-3727

  • DOI: 10.1105/tpc.114.127399
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • The enzymes cinnamoyl-CoA reductase (CCR) and cinnamyl alcohol dehydrogenase (CAD) catalyze the two key reduction reactions in the conversion of cinnamic acid derivatives into monolignol building blocks for lignin polymers in plant cell walls. Here, ...

    The enzymes cinnamoyl-CoA reductase (CCR) and cinnamyl alcohol dehydrogenase (CAD) catalyze the two key reduction reactions in the conversion of cinnamic acid derivatives into monolignol building blocks for lignin polymers in plant cell walls. Here, we describe detailed functional and structural analyses of CCRs from Medicago truncatula and Petunia hybrida and of an atypical CAD (CAD2) from M. truncatula. These enzymes are closely related members of the short-chain dehydrogenase/reductase (SDR) superfamily. Our structural studies support a reaction mechanism involving a canonical SDR catalytic triad in both CCR and CAD2 and an important role for an auxiliary cysteine unique to CCR. Site-directed mutants of CAD2 (Phe226Ala and Tyr136Phe) that enlarge the phenolic binding site result in a 4- to 10-fold increase in activity with sinapaldehyde, which in comparison to the smaller coumaraldehyde and coniferaldehyde substrates is disfavored by wild-type CAD2. This finding demonstrates the potential exploitation of rationally engineered forms of CCR and CAD2 for the targeted modification of monolignol composition in transgenic plants. Thermal denaturation measurements and structural comparisons of various liganded and unliganded forms of CCR and CAD2 highlight substantial conformational flexibility of these SDR enzymes, which plays an important role in the establishment of catalytically productive complexes of the enzymes with their NADPH and phenolic substrates.


    Organizational Affiliation

    Plant Biology Division, Samuel Roberts Noble Foundation, Ardmore, Oklahoma 73401 xiaoqiang.wang@unt.edu.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
cinnamoyl CoA reductase
A
337Petunia x hybridaMutation(s): 0 
Gene Names: PhCCR1CCR1
EC: 1.2.1.44
Find proteins for A0A059TC02 (Petunia hybrida)
Go to UniProtKB:  A0A059TC02
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
I2I
Query on I2I

Download CCD File 
A
molecular iodine
I2
PNDPGZBMCMUPRI-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.195 
  • R-Value Work: 0.176 
  • R-Value Observed: 0.177 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 127.844α = 90
b = 127.844β = 90
c = 80.016γ = 120
Software Package:
Software NamePurpose
MOSFLMdata reduction
SCALAdata scaling
MOLREPphasing
PHENIXrefinement
PDB_EXTRACTdata extraction
BOSdata collection

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-01
    Type: Initial release
  • Version 1.1: 2014-11-12
    Changes: Database references