Evidence map›Paper›PMID 17886322›Full record

ArticleChembiochem : a European journal of chemical biology2007

Interception of the enzymatic conversion of farnesyl diphosphate to 5-epi-aristolochene by using a fluoro substrate analogue: 1-fluorogermacrene A from (2E,6Z)-6-fluorofarnesyl diphosphate.

Juan A Faraldos, Yuxin Zhao, Paul E O'Maille, Joseph P Noel, Robert M Coates

Abstract read
In one paragraph

Article in Chembiochem : a European journal of chemical biology, 2007. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed
1.3field-weighted citation impact, top 20% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

13 citing papers in PubMed, 46 citations in OpenAlex.

  1. Review
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  8. Review
  9. An Efficient Chemoenzymatic Synthesis of Dihydroartemisinic Aldehyde.Angewandte Chemie (International ed. in English) · 2017
    Article
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  12. Review
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

5 authors at 3 institutions in 1 country.

Juan A FaraldosDepartment of Chemistry, University of Illinois, 600 South Mathews Avenue, Urbana, IL 61801, USA.
Yuxin Zhao
Paul E O'Maille
Joseph P Noel
Robert M Coates
Salk Institute for Biological Studies · USUniversity of Illinois Urbana-Champaign · USTakeda (United States) · US

Funding

SPECIFICITY IN TERPENE AND STEROL BIOSYNTHESISR01GM013956 · NIGMS · UNIVERSITY OF ILLINOIS URBANA-CHAMPAIGN · PI COATES, ROBERT M. · 1985 to 2006
$1.8M
TERPENE CYCLASES: FUNCTIONAL DOMAINS AND STRUCTURESR01GM054029 · NIGMS · SALK INSTITUTE FOR BIOLOGICAL STUDIES · PI NOEL, JOSEPH P · 1996 to 2003
$1.2M
Howard Hughes Medical InstituteNIGMS NIH HHS GM 13956NIGMS NIH HHS GM 54029NIGMS NIH HHS R01 GM013956NIGMS NIH HHS R01 GM054029
6 · The paper itself

Abstract

Tobacco 5-epi-aristolochene synthase (TEAS) catalyzes the Mg(II)-dependent cyclizations and rearrangements of (E,E)-farnesyl diphosphate (PP) to the bicyclic sesquiterpene hydrocarbon via a tightly bound (+)-germacrene A as a deprotonated intermediate. With the native enzyme, only a few percent of the putative germacrene A intermediate is released from the active site during the catalytic cycle. 6-Fluorofarnesyl PP was designed and synthesized with the aim of arresting the cyclization-rearrangement mechanism en route to 5-epi-aristolochene. Indeed, incubation of (2E,6Z)-6-fluorofarnesyl PP with recombinant TEAS afforded (-)-1-fluorogermacrene A as the sole product in 58% yield. Steady-state kinetic experiments with farnesyl PP and the 6-fluoro analogue showed that the overall catalytic efficiencies (k(cat)/K(m)) are essentially the same for both substrates. 1-Fluorogermacrene A was characterized by chromatographic properties (TLC, GC), MS, optical rotation, UV, IR and (1)H NMR data, and by heat-induced Cope rearrangement to (+)-1-fluoro-beta-elemene. (1)H NMR spectra at room temperature revealed that this (E,E)-configured fluorocyclodecadiene exists in solution as a 7:3 mixture of UU and UD conformers. 1-Fluorogermacrene A underwent trifluoroacetic acid-catalyzed cyclization to give three 1alpha-fluoroselinene isomers at a rate estimated to be about 1000 times slower than that of the similar cyclization of (+)-germacrene A to the parent selinenes.

Indexed as

Alkyl and Aryl TransferasesBinding SitesCatalysisChromatographyCyclizationHydrocarbons, FluorinatedKineticsModels, ChemicalNicotianaPolyisoprenyl PhosphatesSesquiterpenesSesquiterpenes, GermacraneSpectrum AnalysisStereoisomerismSubstrate Specificity5-epi-aristolochene synthaseAlkyl and Aryl Transferasesaristolochenefarnesyl pyrophosphategermacrene AHydrocarbons, FluorinatedPolyisoprenyl PhosphatesSesquiterpenesSesquiterpenes, Germacrane

Identifiers

PMID17886322
PMCPMC2735885
OpenAlexW2119905565

What OpenQuestion holds

Textmetadata
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.