3LZ9

The Crystal Structure of 5-epi-aristolochene synthase M4 mutant complexed with (2-trans,6-trans)-2-fluorofarnesyl diphosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.243 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural elucidation of cisoid and transoid cyclization pathways of a sesquiterpene synthase using 2-fluorofarnesyl diphosphates.

Noel, J.P.Dellas, N.Faraldos, J.A.Zhao, M.Hess, B.A.Smentek, L.Coates, R.M.O'Maille, P.E.

(2010) Acs Chem.Biol. 5: 377-392

  • DOI: 10.1021/cb900295g
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Sesquiterpene skeletal complexity in nature originates from the enzyme-catalyzed ionization of (trans,trans)-farnesyl diphosphate (FPP) (1a) and subsequent cyclization along either 2,3-transoid or 2,3-cisoid farnesyl cation pathways. Tobacco 5-epi-ar ...

    Sesquiterpene skeletal complexity in nature originates from the enzyme-catalyzed ionization of (trans,trans)-farnesyl diphosphate (FPP) (1a) and subsequent cyclization along either 2,3-transoid or 2,3-cisoid farnesyl cation pathways. Tobacco 5-epi-aristolochene synthase (TEAS), a transoid synthase, produces cisoid products as a component of its minor product spectrum. To investigate the cryptic cisoid cyclization pathway in TEAS, we employed (cis,trans)-FPP (1b) as an alternative substrate. Strikingly, TEAS was catalytically robust in the enzymatic conversion of (cis,trans)-FPP (1b) to exclusively (>/=99.5%) cisoid products. Further, crystallographic characterization of wild-type TEAS and a catalytically promiscuous mutant (M4 TEAS) with 2-fluoro analogues of both all-trans FPP (1a) and (cis,trans)-FPP (1b) revealed binding modes consistent with preorganization of the farnesyl chain. These results provide a structural glimpse into both cisoid and transoid cyclization pathways efficiently templated by a single enzyme active site, consistent with the recently elucidated stereochemistry of the cisoid products. Further, computational studies using density functional theory calculations reveal concerted, highly asynchronous cyclization pathways leading to the major cisoid cyclization products. The implications of these discoveries for expanded sesquiterpene diversity in nature are discussed.


    Organizational Affiliation

    Howard Hughes Medical Institute, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Aristolochene synthase
A
550Nicotiana tabacumMutation(s): 4 
Gene Names: EAS3, EAS4
EC: 4.2.3.61
Find proteins for Q40577 (Nicotiana tabacum)
Go to UniProtKB:  Q40577
Small Molecules
Ligands 2 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
FPF
Query on FPF

Download SDF File 
Download CCD File 
A
(2Z,6E)-2-fluoro-3,7,11-trimethyldodeca-2,6,10-trien-1-yl trihydrogen diphosphate
C15 H27 F O7 P2
DXHJZCKJWKWTCH-WISUYLHISA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.28 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.243 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 126.330α = 90.00
b = 126.330β = 90.00
c = 121.910γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
XDSdata reduction
MOLREPphasing
XDSdata scaling
PDB_EXTRACTdata extraction
XSCALEdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2010-04-07
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance