1HM7

N219L PENTALENENE SYNTHASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.263 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Pentalenene synthase. Analysis of active site residues by site-directed mutagenesis.

Seemann, M.Zhai, G.de Kraker, J.W.Paschall, C.M.Christianson, D.W.Cane, D.E.

(2002) J.Am.Chem.Soc. 124: 7681-7689

  • Primary Citation of Related Structures:  1HM4

  • PubMed Abstract: 
  • Incubation of farnesyl diphosphate (1) with the W308F or W308F/H309F mutants of pentalenene synthase, an enzyme from Streptomyces UC5319, yielded pentalenene (2), accompanied by varying proportions of (+)-germacrene A (7) with relatively minor change ...

    Incubation of farnesyl diphosphate (1) with the W308F or W308F/H309F mutants of pentalenene synthase, an enzyme from Streptomyces UC5319, yielded pentalenene (2), accompanied by varying proportions of (+)-germacrene A (7) with relatively minor changes in k(cat) and k(cat)/K(m). By contrast, single H309 mutants gave rise to both (+)-germacrene A (7) and protoilludene (8) in addition to pentalenene (2). Mutation to glutamate of each of the three aspartate residues in the Mg(2+)-binding aspartate-rich domain, (80)DDLFD, resulted in reduction in the k(cat)/K(m) for farnesyl diphosphate and formation of varying proportions of pentalenene and (+)-germacrene A (7). Formation of (+)-germacrene A (7) by the various pentalenene synthase mutants is the result of a derailment of the natural anti-Markovnikov cyclization reaction, and not simply the consequence of trapping of a normally cryptic, carbocationic intermediate. Both the N219A and N219L mutants of pentalenene synthase were completely inactive, while the corresponding N219D mutant had a k(cat)/K(m) which was 3300-fold lower than that of the wild-type synthase, and produced a mixture of pentalenene (2) (91%) and the aberrant cyclization product beta-caryophyllene (9) (9%). Finally, the F77Y mutant had a k(cat)/K(m) which was reduced by 20-fold compared to that of the wild-type synthase.


    Organizational Affiliation

    Department of Chemistry, Box H, Brown University, Providence, Rhode Island 02912-9108, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PENTALENENE SYNTHASE
A, B
336Streptomyces exfoliatusGene Names: penA
EC: 4.2.3.7
Find proteins for Q55012 (Streptomyces exfoliatus)
Go to UniProtKB:  Q55012
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.308 
  • R-Value Work: 0.263 
  • Space Group: P 63
Unit Cell:
Length (Å)Angle (°)
a = 181.400α = 90.00
b = 181.400β = 90.00
c = 56.400γ = 120.00
Software Package:
Software NamePurpose
DENZOdata reduction
CNSrefinement
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-30
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance