Article (Scientific journals)
Characterization and tissue-specific expression of two lepidopteran farnesyl diphosphate synthase homologs: Implications for the biosynthesis of ethyl-substituted juvenile hormones
Cusson, M.; Beliveau, C.; Sen, Se. et al.
2006In Proteins, 65 (3), p. 742-758
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Keywords :
JH homologs; mevalonate pathway; FPPS; gene structure; FARM; homology modeling; docking; yeast complementation assay; quantitative real-time PCR
Abstract :
[en] The sesquiterpenoid juvenile hormone (JH) regulates insect development and reproduction. Most insects produce only one chemical form of JH, but the Lepidoptera produce four derivatives featuring ethyl branches. The biogenesis of these JHs requires the synthesis of ethyl-substituted farnesyl diphosphate (FPP) by FPP synthase (FPPS). To determine if there exist more than one lepidopteran FPPS, and whether one FPPS homolog is better adapted for binding the builder ethyl-branched substrates/products, we cloned three lepidopteran FPPS cDNAs, two from Choristoneura fumiferana and one from Pseudaletia unipuncta. Amino acid sequence comparisons among these and other eukaryotic FPPSs led to the recognition of two lepidopteran FPPS types. Type-I FPPSs display unique active site substitutions, including several in and near the first aspartaterich motif, whereas type-II proteins have a more "conventional" catalytic cavity. In a yeast assay, a Drosophila FPPS clone provided full complementation of an FPPS mutation, but lepidopteran FPPS clones of either type yielded only partial complementation, suggesting unusual catalytic features and/or requirements of these enzymes. Although a structural analysis of lepidopteran FPPS active sites suggested that type-I enzymes are better suited than type-II for generating ethyl-substituted products, a quantitative real-time PCR assessment of their relative abundance in insect tissues indicated that type-I expression is ubiquitous whereas that of type-II is essentially confined to the JH-producing glands, where its transcripts are ∼20 times more abundant than those of type-I. These results suggest that type-II FPPS plays a leading role in lepidopteran JH biosynthesis in spite of its apparently more conventional catalytic cavity
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Cusson, M.
Beliveau, C.
Sen, Se.
Vandermoten, Sophie ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Rutledge, Rg.
Stewart, D.
Francis, Frédéric  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Haubruge, Eric  ;  Université de Liège - ULiège > Gembloux Agro-Bio Tech
Rehse, P.
Huggins, Dj.
Dowling, Apg.
Grant, Gh.
Language :
English
Title :
Characterization and tissue-specific expression of two lepidopteran farnesyl diphosphate synthase homologs: Implications for the biosynthesis of ethyl-substituted juvenile hormones
Publication date :
2006
Journal title :
Proteins
ISSN :
0887-3585
eISSN :
1097-0134
Publisher :
Wiley-Liss Inc, United States - New York
Volume :
65
Issue :
3
Pages :
742-758
742–758
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 03 September 2009

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