Reference : Structural features conferring dual Geranyl/Farnesyl diphosphate synthase activity to an...
Scientific journals : Article
Life sciences : Entomology & pest control
http://hdl.handle.net/2268/28106
Structural features conferring dual Geranyl/Farnesyl diphosphate synthase activity to an aphid prenyltransferase
English
Vandermoten, Sophie mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Santini, Sébastien [> >]
Haubruge, Eric mailto [Université de Liège - ULg > Services administratifs généraux > Vice-Recteur de Gembloux Agro Bio Tech - Gembloux Agro-Bio Tech >]
Heuze, Fabien [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Francis, Frédéric [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Brasseur, Robert mailto [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Cusson, Michel [> > > >]
Charloteaux, Benoît [Université de Liège - ULg > Gembloux Agro-Bio Tech > Gembloux Agro-Bio Tech >]
Oct-2009
Insect Biochemistry and Molecular Biology
Pergamon Press (part of Elsevier Science)
39
10
707-716
Yes (verified by ORBi)
International
0965-1748
1879-0240
Oxford
United Kingdom
[en] Aphid ; Isoprenyl diphosphate synthase ; Pheromone and juvenile hormone biosynthesis ; Homology modelling ; Molecular dynamics
[en] In addition to providing lipid chains for protein prenylation, short-chain isoprenyl diphosphate synthases (scIPPSs) play a pivotal role in the biosynthesis of numerous mevalonate pathway end-products, including insect juvenile hormone and terpenoid pheromones. For this reason, they are being considered as targets for pesticide development. Recently, we characterized an aphid scIPPS displaying dual geranyl diphosphate (GPP; C10)/farnesyl diphosphate (FPP; C15) synthase activity in vitro. To identify the mechanism(s) responsible for this dual activity, we assessed the product selectivity of aphid scIPPSs bearing mutations at Gln107 and/or Leu110, the fourth and first residue upstream from the “first aspartate-rich motif” (FARM), respectively. All but one resulted in significant changes in product chain-length selectivity, effectively increasing the production of either GPP (Q107E, L110W) or FPP (Q107F, Q107F–L110A); the other mutation (L110A) abolished activity. Although some of these effects could be attributed to changes in steric hindrance within the catalytic cavity, molecular dynamics simulations identified other contributing factors, including residue-ligand Van der Waals interactions and the formation of hydrogen bonds or salt bridges between Gln107 and other residues across the catalytic cavity, which constitutes a novel product chain-length determination mechanism for scIPPSs. Thus the aphid enzyme apparently evolved to maintain the capacity to produce both GPP and FPP through a balance between these mechanisms.
http://hdl.handle.net/2268/28106
also: http://hdl.handle.net/2268/34177
10.1016/j.ibmb.2009.08.007

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