Functional expression of α-latrotoxin in baculovirus system

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Abstract

To facilitate the study of the mechanism of α-latrotoxin action, it is necessary to create a biologically active recombinant toxin. Mature α-latrotoxin is naturally produced by post-translational cleavage, probably at two furin sites located at the N- and C-termini of the precursor. A recombinant baculovirus has now been constructed, which encodes the melittin signal peptide fused to the 130-kDa mature toxin between the furin sites. Insect cells, infected with this baculovirus, secreted recombinant α-latrotoxin. This was partially purified and proved indistinguishable from the natural toxin with respect to its molecular mass, immunostaining, toxicity to mice, binding to α-latrotoxin receptors (latrophilin or neurexin Iα) and electrophysiological recording in the mouse diaphragm. The successful expression of recombinant α-latrotoxin permits mutational analysis of the toxin. Copyright (C) 1999 Federation of European Biochemical Societies.

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Volynski, K. E., Nosyreva, E. D., Ushkaryov, Y. A., & Grishin, E. V. (1999). Functional expression of α-latrotoxin in baculovirus system. FEBS Letters, 442(1), 25–28. https://doi.org/10.1016/S0014-5793(98)01624-X

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