Journal ArticleDOI
A Toxic Fragment from the Entomocidal Crystal Protein of Bacillus thuringiensis
TLDR
In this paper, solid phase tryptic digestion of the solubilized crystal protein bound on a DEAE-cellulose column was found to be a successful method to prepare a toxic fragment without denaturation.Abstract:
Purified crystal protein from Bacillus thuringiensis subsp. dendrolimus strain T84A1 gave a single polypeptide band (apparent mol. wt. 145,000) on SDS-PAGE and the only N-terminal amino acid sequence was Met–Asp–Asn–Asn–Pro–Asn–Ile–. No pentose or hexose was detected. Solid phase tryptic digestion of the solubilized crystal protein bound on a DEAE-cellulose column was found to be a successful method to prepare a toxic fragment without denaturation. The resulting fragment (fragment T) was slightly basic (pI 8.9) and the molecular weight was estimated as 58,000 on SDS-PAGE and by gel filtration without denaturing agents. The apparent number of the amono acid residues was 516 and the N- and C-terminal sequences were determined as Ile–Glu–X–Gly–Tyr–Thr– and –Leu–Arg, respectively. The molar specific toxicities of the solubilized crystal protein and fragment T were nearly identical. The fragment T retained the full toxicity and selectivity of the intat crystal protein. Location of the fragment T in the crystal...read more
Citations
More filters
Journal ArticleDOI
Bacillus thuringiensis and Its Pesticidal Crystal Proteins
E. Schnepf,Neil Crickmore,J. Van Rie,Didier Lereclus,J. Baum,Jerald S. Feitelson,Daniel R. Zeigler,Donald H. Dean +7 more
TL;DR: Researchers are reporting promising results in engineering more-useful toxins and formulations, in creating transgenic plants that express pesticidal activity, and in constructing integrated management strategies to insure that these products are utilized with maximum efficiency and benefit.
Journal ArticleDOI
Insecticidal crystal proteins of Bacillus thuringiensis.
Herman Höfte,H R Whiteley +1 more
TL;DR: In this article, a classification for crystal protein genes of Bacillus thuringiensis is presented, based on the insecticidal spectra and the amino acid sequences of the encoded proteins.
Insecticidal crystal proteins of Bacilllus thuringiensis
H. Höfte,H.R. Whiteley +1 more
TL;DR: Studies on the biochemical mechanisms of toxicity suggest that B. thuringiensis crystal proteins induce the formation of pores in membranes of susceptible cells, and these approaches are potentially powerful strategies for the protection of agriculturally important crops against insect damage.
Journal ArticleDOI
Insect Tolerant Transgenic Tomato Plants
David A. Fischhoff,Katherine S. Bowdish,Katherine S. Bowdish,Frederick J. Perlak,Pamela G. Marrone,Sheila McCormick,Sheila McCormick,Jeanne G. Niedermeyer,Duff A. Dean,Kuniko Kusano-Kretzmer,Ernest J. Mayer,Dean E. Rochester,Stephen G. Rogers,Robert T. Fraley +13 more
TL;DR: The structure of an insect control protein gene from Bacillus thuringiensis var.
References
Related Papers (5)
Cloning and expression of the Bacillus thuringiensis crystal protein gene in Escherichia coli
H E Schnepf,H R Whiteley +1 more