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 

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Ligand Structure Quality Assessment 


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

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


  • 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)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
5-EPI-ARISTOLOCHENE SYNTHASE548Nicotiana tabacumMutation(s): 0 
UniProt
Find proteins for Q40577 (Nicotiana tabacum)
Explore Q40577 
Go to UniProtKB:  Q40577
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ40577
Sequence Annotations
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  • Reference Sequence
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

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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
  • Version 1.3: 2023-08-09
    Changes: Database references, Derived calculations, Refinement description