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. 1993 Apr;175(8):2314–2320. doi: 10.1128/jb.175.8.2314-2320.1993

Cytotoxicity and ADP-ribosylating activity of the mosquitocidal toxin from Bacillus sphaericus SSII-1: possible roles of the 27- and 70-kilodalton peptides.

T Thanabalu 1, C Berry 1, J Hindley 1
PMCID: PMC204519  PMID: 8096838

Abstract

Clones expressing regions of the 100-kDa Bacillus sphaericus SSII-1 mosquitocidal toxin (Mtx) as fusion proteins with glutathione S-transferase were constructed, and the toxin-derived peptides were purified. The in vitro ADP-ribosylation activities of these peptides and their effects on larvae and cells in culture were studied. Mtx25 (amino acids 30 to 493) was found to ADP-ribosylate two proteins with molecular masses of 38 and 42 kDa, respectively, in Culex quinquefasciatus (G7) cell extracts, in addition to ADP-ribosylating itself. Mtx21 (amino acids 30 to 870; or a combination of Mtx25 and Mtx26 (amino acids 259 to 870) caused mortality in C. quinquefasciatus larvae. Mtx25, Mtx26, or Mtx24 (amino acids 30 to 276) alone and Mtx24 in combination with Mtx26 were not toxic to larvae. Mtx21 and Mtx26 produced marked morphological changes in G7 cells and to a lesser extent in Aedes aegypti cells but had no effect on Anopheles gambiae or HeLa cells. Thus, a domain in the N-terminal region of the Mtx protein is sufficient for ADP-ribosylation of C. quinquefasciatus cell protein, and a domain in the C-terminal region is sufficient for toxicity to cultured C. quinquefasciatus cells; however, both regions are necessary for toxicity to mosquito larvae.

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Selected References

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