5EAS

5-EPI-ARISTOLOCHENE SYNTHASE FROM NICOTIANA TABACUM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.240 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for cyclic terpene biosynthesis by tobacco 5-epi-aristolochene synthase.

Starks, C.M.Back, K.Chappell, J.Noel, J.P.

(1997) Science 277: 1815-1820

  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Terpene cyclases catalyze the synthesis of cyclic terpenes with 10-, 15-, and 20-carbon acyclic isoprenoid diphosphates as substrates. Plants have been a source of these natural products by providing a homologous set of terpene synthases. The crystal ...

    Terpene cyclases catalyze the synthesis of cyclic terpenes with 10-, 15-, and 20-carbon acyclic isoprenoid diphosphates as substrates. Plants have been a source of these natural products by providing a homologous set of terpene synthases. The crystal structures of 5-epi-aristolochene synthase, a sesquiterpene cyclase from tobacco, alone and complexed separately with two farnesyl diphosphate analogs were analyzed. These structures reveal an unexpected enzymatic mechanism for the synthesis of the bicyclic product, 5-epi-aristolochene, and provide a basis for understanding the stereochemical selectivity displayed by other cyclases in the biosynthesis of pharmacologically important cyclic terpenes. As such, these structures provide templates for the engineering of novel terpene cyclases.


    Related Citations: 
    • Purification and Characterization of an Inducible Sesquiterpene Cyclase from Elicitor-Treated Tobacco Cell Suspension Cultures
      Vogeli, U.,Freeman, J.W.,Chappell, J.
      (1993) Plant Physiol. 93: 182
    • Expression of a Plant Sesquiterpene Cyclase Gene in Escherichia Coli
      Back, K.,Yin, S.,Chappell, J.
      (1994) Arch.Biochem.Biophys. 315: 527


    Organizational Affiliation

    Structural Biology Laboratory, The Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
5-EPI-ARISTOLOCHENE SYNTHASE
A
548Nicotiana tabacumMutation(s): 0 
Gene Names: EAS3, EAS4
EC: 4.2.3.61
Find proteins for Q40577 (Nicotiana tabacum)
Go to UniProtKB:  Q40577
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.25 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.240 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 124.730α = 90.00
b = 124.730β = 90.00
c = 118.940γ = 90.00
Software Package:
Software NamePurpose
VECSUMmodel building
X-PLORphasing
X-PLORrefinement
SCALEPACKdata scaling
DENZOdata reduction
VECSUMphasing
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-10-15
    Type: Initial release
  • Version 1.1: 2008-03-25
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2011-11-16
    Type: Atomic model