Abstract

We analysed peptide hormones of South African species of the recently described insect order Mantophasmatodea. Mass spectrometric techniques made it possible to analyse minute amounts of material stored in different neurohemal organs of single specimens. The methodological approach underlying this application is described and resulted in the first completely sequenced peptide hormones of the Mantophasmatodea, namely adipokinetic hormone, leucomyosuppressin, and a novel member of the periviscerokinins. The extensive peptide screening revealed a surprisingly clear differentation of species by peptide mass fingerprints. This is the first successful attempt to catalogue neuropeptides of insects for systematic/taxonomic purposes. In total, 14 of 32 peptides differed across species. Moreover, the data presented here show a hierarchy in the tendency for modifications among the different peptide hormones. Die vorliegende Arbeit beschreibt eine umfassende Analyse von Peptidhormonen der kürzlich beschriebenen Insektenordnung Mantophasmatodea. Mittels moderner massenspektrometrischer Methoden ist es gelungen, die Neurohaemalorgane von einzelnen Individuen verschiedener Arten zu untersuchen. Der methodische Ansatz hierzu wird vorgestellt und die ersten komplett sequenzierten Neurohormone der Mantophasmatodea beschrieben. Die Ergebnisse belegen eine überrraschend klare Differenzierbarkeit der Arten anhand der ermittelten Massendaten, und ermöglichen es erstmals, Neuropeptide für taxonomisch/systematische Zielstellungen zu katalogisieren. Die vorliegenden Daten bestätigen zudem eine unterschiedliche Tendenz zu Sequenzmodifizierungen zwischen den verschiedenen Peptidfamilien.

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