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  Metal ions control product specificity of isoprenyl diphosphate synthases in the insect terpenoid pathway

Frick, S., Nagel, R., Schmidt, A., Bodemann, R., Rahfeld, P., Pauls, G., et al. (2013). Metal ions control product specificity of isoprenyl diphosphate synthases in the insect terpenoid pathway. Proceedings of the National Academy of Sciences of the United States of America, 110(11), 4194-4199. doi:10.1073/pnas.1221489110.

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 Creators:
Frick, Sindy1, Author              
Nagel, Raimund2, 3, Author              
Schmidt, Axel2, Author              
Bodemann, René1, 3, Author              
Rahfeld, Peter1, 3, Author              
Pauls, Gerhard1, 3, Author              
Brandt, Wolfgang, Author
Gershenzon, Jonathan2, Author              
Boland, Wilhelm1, Author              
Burse, Antje4, Author              
Affiliations:
1Department of Bioorganic Chemistry, Prof. Dr. W. Boland, MPI for Chemical Ecology, Max Planck Society, ou_24028              
2Department of Biochemistry, Prof. J. Gershenzon, MPI for Chemical Ecology, Max Planck Society, ou_421893              
3IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              
4Research Group Dr. A. Burse, Chemical Defense of Leaf Beetles, Department of Bioorganic Chemistry, Prof. Dr. W. Boland, MPI for Chemical Ecology, Max Planck Society, ou_543545              

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 Abstract: Isoprenyl diphosphate synthases (IDSs) produce the ubiquitous branched-chain diphosphates of different lengths that are precursors of all major classes of terpenes. Typically, individual short-chain IDSs (scIDSs) make the C10, C15, and C20 isoprenyl diphosphates separately. Here, we report that the product length synthesized by a single scIDS shifts depending on the divalent metal cofactor present. This previously undescribed mechanism of carbon chain-length determination was discovered for a scIDS from juvenile horseradish leaf beetles, Phaedon cochleariae. The recombinant enzyme P. cochleariae isoprenyl diphosphate synthase 1 (PcIDS1) yields 96% C10-geranyl diphosphate (GDP) and only 4% C15-farnesyl diphosphate (FDP) in the presence of Co(2+) or Mn(2+) as a cofactor, whereas it yields only 18% C10 GDP but 82% C15 FDP in the presence of Mg(2+). In reaction with Co(2+), PcIDS1 has a Km of 11.6 μM for dimethylallyl diphosphate as a cosubstrate and 24.3 μM for GDP. However, with Mg(2+), PcIDS1 has a Km of 1.18 μM for GDP, suggesting that this substrate is favored by the enzyme under such conditions. RNAi targeting PcIDS1 revealed the participation of this enzyme in the de novo synthesis of defensive monoterpenoids in the beetle larvae. As an FDP synthase, PcIDS1 could be associated with the formation of sesquiterpenes, such as juvenile hormones. Detection of Co(2+), Mn(2+), or Mg(2+) in the beetle larvae suggests flux control into C10 vs. C15 isoprenoids could be accomplished by these ions in vivo. The dependence of product chain length of scIDSs on metal cofactor identity introduces an additional regulation for these branch point enzymes of terpene metabolism.

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 Dates: 20132013-02-25
 Publication Status: Published online
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 Identifiers: Other: BOL553
DOI: 10.1073/pnas.1221489110
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Title: Proceedings of the National Academy of Sciences of the United States of America
  Other : Proc. Natl. Acad. Sci. U. S. A.
Source Genre: Journal
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Publ. Info: National Academy of Sciences
Pages: - Volume / Issue: 110 (11) Sequence Number: - Start / End Page: 4194 - 4199 Identifier: ISSN: 0027-8424
CoNE: https://pure.mpg.de/cone/journals/resource/954925427230