DNA barcoding of scorpions from Kosovo, with the first record of Alpiscorpius dinaricus (Di Caporiacco) (Scorpiones: Euscorpiidae)

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  DNA barcoding of scorpions from Kosovo, with the first record of Alpiscorpius dinaricus (Di Caporiacco) (Scorpiones: Euscorpiidae) ABSTRACT This study presents DNA barcoding data for Alpiscorpius dinaricus (Di Caporiacco) and Euscorpius hadzii Caporiacco. Barcode sequences were compared with publicly available reference data to support species identification, together with the evaluation of diagnostic morphological characters. Alpiscorpius dinaricus is recorded from Kosovo for the first time, representing a new national record and contributing to the knowledge of euscorpiid diversity in the region. Diagnostic illustrations of A. dinaricus are provided to facilitate reliable identification and to support future faunistic, taxonomic, and biogeographic studies. Euscorpius hadzii , previously known only from Prizren district, is now reported also from Bjeshkët e Nemuna Mountains (Western Kosovo). Geci, D., Ibrahimi, H., Bilalli, A., Musliu, M., Strohmeier, T., Koblmüller, S., … S...

Shining a light on the photochemical stability of peptidic bioinsecticides

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Shining a light on the photochemical stability of peptidic bioinsecticides

Abstract

Peptide toxins from spider venoms are being increasingly hailed as environmentally friendly alternatives to market-dominating small-molecule chemical insecticides. While the stability of knotted spider-venom peptides towards enzymatic degradation, temperature changes and varying pH conditions has already been examined, their susceptibility to sunlight remains unclear. Field applications of insecticides demand that the insecticidal component is active for at least a few days to ensure sufficient eradication of the targeted insect pests. We therefore exposed four insecticidal spider venom peptides (ω-Hv1a, ω/κ-Hv1a, Ta1a and Dc1a) to continuous artificial sunlight for up to 7 days. After certain incubation periods, we quantified the percentage of intact peptide and identified sites of peptide cleavage. We found that after 3 days of continuous exposure (= 6 days of 12 h/d sunlight), the amount of remaining intact peptide was 16% (Ta1a), 21% (Dc1a), 55% (ω-Hv1a), and 67% (ω/κ-Hv1a), whereas bovine serum albumin was completely degraded. Even after 7 days (= 14 days of 12 h/d sunlight) exposure, more than 50% of ω/κ-Hv1a and ω-Hv1a remained intact. Peptides with lower molecular mass tended to be less susceptible to sunlight, while cleavage of peptide bonds involving proline or cysteine were most susceptible to photochemical degradation. The photochemical changes detected by mass spectrometry mainly comprised oxidations, deamidations, and cysteine-targeted modifications.
Herzig, V., Ahabh, A., Jones, A., & King, G. F. (2025). Shining a light on the photochemical stability of peptidic bioinsecticides. Toxicon, 108381. https://doi.org/10.1016/j.toxicon.2025.108381