Primary structure of scorpion anti‐insect toxins isolated from the venom of Leiurus quinquestriatus quinquestriatus
- 26 February 1990
- journal article
- research article
- Published by Wiley in FEBS Letters
- Vol. 261 (2), 423-426
- https://doi.org/10.1016/0014-5793(90)80607-k
Abstract
The amino acid sequences of insect-selective scorpion toxins, purified from the venom of Leiurus quinquestriatus quinquestriatus, have been determined by automatic phenyl isothiocyanate degradation of the S-carboxymethylated proteins and derived proteolytic peptides. The excitatory toxin Lqq IT1 and Lqq IT1' (70 residues) show the shift of one half-cystine from an external position, which is characteristic of anti-mammal toxins, to an internal sequence position. Lqq IT2, (61 residues) displays the half-cystine residue in position 12, common to the sequence of all known antimammal toxins; it induces flaccid paralysis on insects but is non-toxic for the mouse. Lqq IT2, structurally defines a new type of anti-insect toxins from scorpion venoms. CD spectra and immunological data are in agreement with this findingKeywords
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