2J5C

Rational conversion of substrate and product specificity in a monoterpene synthase. Structural insights into the molecular basis of rapid evolution.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.218 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Rational Conversion of Substrate and Product Specificity in a Salvia Monoterpene Synthase: Structural Insights Into the Evolution of Terpene Synthase Function.

Kampranis, S.C.Ioannidis, D.Purvis, A.Mahrez, W.Ninga, E.Katerelos, N.A.Anssour, S.Dunwell, J.M.Degenhardt, J.Makris, A.M.Goodenough, P.W.Johnson, C.B.

(2007) Plant Cell 19: 1994

  • DOI: 10.1105/tpc.106.047779

  • PubMed Abstract: 
  • Terpene synthases are responsible for the biosynthesis of the complex chemical defense arsenal of plants and microorganisms. How do these enzymes, which all appear to share a common terpene synthase fold, specify the many different products made almo ...

    Terpene synthases are responsible for the biosynthesis of the complex chemical defense arsenal of plants and microorganisms. How do these enzymes, which all appear to share a common terpene synthase fold, specify the many different products made almost entirely from one of only three substrates? Elucidation of the structure of 1,8-cineole synthase from Salvia fruticosa (Sf-CinS1) combined with analysis of functional and phylogenetic relationships of enzymes within Salvia species identified active-site residues responsible for product specificity. Thus, Sf-CinS1 was successfully converted to a sabinene synthase with a minimum number of rationally predicted substitutions, while identification of the Asn side chain essential for water activation introduced 1,8-cineole and alpha-terpineol activity to Salvia pomifera sabinene synthase. A major contribution to product specificity in Sf-CinS1 appears to come from a local deformation within one of the helices forming the active site. This deformation is observed in all other mono- or sesquiterpene structures available, pointing to a conserved mechanism. Moreover, a single amino acid substitution enlarged the active-site cavity enough to accommodate the larger farnesyl pyrophosphate substrate and led to the efficient synthesis of sesquiterpenes, while alternate single substitutions of this critical amino acid yielded five additional terpene synthases.


    Organizational Affiliation

    Department of Natural Products and Biotechnology, Mediterranean Agronomic Institute of Chania, Chania, Greece. sotirios@maich.gr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
1,8-CINEOLE SYNTHASE
A, B
569Salvia fruticosaMutation(s): 0 
Gene Names: CinS1
Find proteins for A6XH05 (Salvia fruticosa)
Go to UniProtKB:  A6XH05
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
BME
Query on BME

Download SDF File 
Download CCD File 
A, B
BETA-MERCAPTOETHANOL
C2 H6 O S
DGVVWUTYPXICAM-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.235 
  • R-Value Work: 0.218 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 124.550α = 90.00
b = 171.150β = 90.00
c = 123.810γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
MOLREPphasing
MOSFLMdata reduction
SCALAdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-06-26
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance