5EAU

5-EPI-ARISTOLOCHENE SYNTHASE FROM NICOTIANA TABACUM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.2 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

  • DOI: 10.1126/science.277.5333.1815
  • Primary Citation of Related Structures:  
    5EAT, 5EAS, 5EAU

  • 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: 
    • Expression of a Plant Sesquiterpene Cyclase Gene in Escherichia Coli
      Back, K., Yin, S., Chappell, J.
      (1994) Arch Biochem Biophys 315: 527
    • 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

    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:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
5-EPI-ARISTOLOCHENE SYNTHASEA548Nicotiana tabacumMutation(s): 0 
Gene Names: EAS3EAS4
EC: 4.2.3.61
Find proteins for Q40577 (Nicotiana tabacum)
Explore Q40577 
Go to UniProtKB:  Q40577
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FFF
Query on FFF

Download CCD File 
A
TRIFLUOROFURNESYL DIPHOSPHATE
C15 H25 F3 O7 P2
PXLMLAFPAPGGKK-GVCYOOEQSA-N
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.287 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 125.96α = 90
b = 125.96β = 90
c = 122.97γ = 90
Software Package:
Software NamePurpose
AMoREphasing
MLPHAREphasing
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1998-04-08
    Type: Initial release
  • Version 1.1: 2008-03-25
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance