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Mass spectrometric analysis of PDF [pigment-dispersing factor] neurons of Periplaneta americana L.

100%

Neupert S.

2005

nr 3

183-187

Novel members of the AKH-RPCH peptide family: isolation of AKH from the corpora cardiaca of the two beetle species, Cheilomenes lunata and Coccinella septempunctata

100%

Neupert S.

Pestycydy

2007

nr 3-4

39-43

Adipokinetic hormones (AKH) are synthesized in endocrine cells of the glandular corpora cardiaca, in the anterior part of the retrocerebral complex. AKH plays an important role in the metabolism of carbohydrates that fuel energydepleting activities such as flight and walking. To date, the primary sequences of eight isoforms from various beetle species have been elucidated. In this study, the glandular part of the CC from two Ladybird beetles, Cheilomenes lunata and Coccinella septempunctata were directly analysed by MALDI-TOF mass spectrometry. Subsequently, the amino acid sequences of both putative novel AKHs were confirmed by tandem mass spectrometry.

Identification of a CAPA-PVK [Ixori-PVK] from single cells of the gulf Gulf Coast tick, Amblyomma maculatum

38%

Neupert S. , Russell W. K. , Russell D. H. , Strey O. F. , Teel P. D. , Strey A. , Nachman R. J.

nr 1-2

67-73

MALDI-TOF/TOF tandem mass spectrometry has been applied to determine the complete sequence of a CAPA-PVK in the Gulf Coast tick, Amblyomma maculatum. Single cell analysis allowed the identification of the amino acid sequence of Ixori-PVK (PALIPFPRV-NH2), a periviscerokinin which had previously been identified from two other ticks, Ixodes ricinus and Boophilus microplus. The identification indicates greater conservation of sequence for the CAPA-PVK/CAP2b family in ticks as compared with insects. Side-chain fragmentation experiments provided data to distinguish between Leu/Ile ambiguities. The tick CAPA peptide shows a high sequence homology with other members of the insect periviscerokinin/ CAP2b peptides, which are associated with the regulation of critical physiological processes such as diuresis. Thus, the identification of this neuropeptide will provide the experimental basis to better understand regulation of water balance in these arthropods, providing a potential opportunity to develop neuropeptide-based control strategies against these livestock pests.