A specific binding protein from Manduca sexta for the insecticidal toxin of Bacillus thuringiensis subsp. berliner

R. K. Vadlamudi, T. H. Ji, L. A. Bulla

Research output: Contribution to journalArticlepeer-review

144 Scopus citations

Abstract

Biopesticides based on the bacterium Bacillus thuringiensis have attracted wide attention as safe alternatives to chemical pesticides. In this paper, we report, for the first time, the identification and purification of a single binding protein from a lepidopteran insect, Manduca sexta, that is specific for a cryIA toxin of B. thuringiensis. The purified protein appeared as a single band of 210 kDa on a two-dimensional gel, had a pI of approximately 5.5, and stained with Schiff's reagent. The band material was sensitive to proteolytic digestion and was rich with acidic amino acids, indicating its protein nature. Radiolabeled toxin bound to the protein with a K(d) value of 708 pM and could be specifically blocked by unlabeled toxin but not by toxins from other subspecies of B. thuringiensis. This study lays the groundwork to clone the toxin binding protein and to determine the molecular mechanism(s) of toxin action.

Original languageEnglish (US)
Pages (from-to)12334-12340
Number of pages7
JournalJournal of Biological Chemistry
Volume268
Issue number17
StatePublished - Jan 1 1993
Externally publishedYes

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Fingerprint Dive into the research topics of 'A specific binding protein from Manduca sexta for the insecticidal toxin of Bacillus thuringiensis subsp. berliner'. Together they form a unique fingerprint.

Cite this