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  Glandular beta-glucosidases in juvenile Chrysomelina leaf beetles support the evolution of a host-plant-dependent chemical defence

Rahfeld, P., Häger, W., Kirsch, R., Pauls, G., Becker, T., Schulze, E., et al. (2015). Glandular beta-glucosidases in juvenile Chrysomelina leaf beetles support the evolution of a host-plant-dependent chemical defence. Insect Biochemistry and Molecular Biology, 58, 28-38. doi:10.1016/j.ibmb.2015.01.003.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0024-5CB5-C Version Permalink: https://hdl.handle.net/21.11116/0000-0009-3237-1
Genre: Journal Article

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 Creators:
Rahfeld, Peter1, 2, Author           
Häger, Wiebke1, Author           
Kirsch, Roy3, Author           
Pauls, Gerhard1, 2, Author           
Becker, Tobias1, Author           
Schulze, E., Author
Wielsch, Natalie4, Author           
Wang, Ding1, 2, Author           
Groth, Marco, Author
Brandt, Wolfgang, Author
Boland, Wilhelm1, Author           
Burse, Antje5, Author           
Affiliations:
1Department of Bioorganic Chemistry, Prof. Dr. W. Boland, MPI for Chemical Ecology, Max Planck Society, ou_24028              
2IMPRS on Ecological Interactions, MPI for Chemical Ecology, Max Planck Society, Jena, DE, ou_421900              
3Department of Entomology, Prof. D. G. Heckel, MPI for Chemical Ecology, Max Planck Society, ou_421895              
4Research Group Mass Spectrometry, MPI for Chemical Ecology, Max Planck Society, ou_421899              
5Research 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: Plant-feeding insects are spread across the entire plant kingdom. Because they chew externally on leaves, leaf beetle of the subtribe Chrysomelina sensu stricto are constantly exposed to life-threatening predators and parasitoids. To counter these pressures, the juveniles repel their enemies by displaying glandular secretions that contain defensive compounds. These repellents can be produced either de novo (iridoids) or by using plant-derived precursors. The autonomous production of iridoids pre-dates the evolution of phytochemical-based defense strategies. Both strategies include hydrolysis of the secreted non-toxic glycosides in the defensive exudates. By combining in vitro as well as in vivo experiments, we show that iridoid de novo producing as well as sequestering species rely on secreted β-glucosidases to cleave the pre-toxins. Our phylogenetic analyses support a common origin of chrysomeline β-glucosidases. The kinetic parameters of these β-glucosidases demonstrated substrate selectivity which reflects the adaptation of Chrysomelina sensu stricto to the chemistry of their hosts during the course of evolution. However, the functional studies also showed that the broad substrate selectivity allows building a chemical defense, which is dependent on the host plant, but does not lead to an "evolutionary dead end".

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 Dates: 2014-01-062014-01-132015
 Publication Status: Issued
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 Identifiers: Other: BOL613
DOI: 10.1016/j.ibmb.2015.01.003
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Title: Insect Biochemistry and Molecular Biology
  Other : Insect Biochem. Mol. Biol.
Source Genre: Journal
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Publ. Info: Oxford [England] : Pergamon
Pages: - Volume / Issue: 58 Sequence Number: - Start / End Page: 28 - 38 Identifier: ISSN: 0965-1748
CoNE: https://pure.mpg.de/cone/journals/resource/954925581163