Characterization of the entomocidal parasporal crystal of Bacillus thuringiensis.
TLDR
Chemical modification of the sulfhydryl groups inhibits the proteolytic and insecticidal activities of the proendotoxin, suggesting that cysteine residues may be present in the active site of the protein.Abstract:
The parasporal crystalline protoxin of Bacillus thuringiensis contains a single glycoprotein subunit that has a molecular weight of approximately 1.2 X 10(5). The carbohydrate consists of glucose (3.8%) and mannose (1.8%). At alkaline pH, the proendotoxin is apparently solubilized and activated by an autolytic mechanism involving an inherent sulfhydryl protease that renders the protoxin insecticidal. Activation generates protons, degraded polypeptides, sulfhydryl group reactivity, proteolytic activity, and insect toxicity. Chemical modification of the sulfhydryl groups inhibits the proteolytic and insecticidal activities, suggesting that cysteine residues may be present in the active site of the protein.read more
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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.
Journal ArticleDOI
Cloning and expression of the Bacillus thuringiensis crystal protein gene in Escherichia coli
H E Schnepf,H R Whiteley +1 more
TL;DR: Sau 3A1 partial digestion fragments from Bacillus thuringiensis var. kurstaki HD-1 plasmid DNA were ligated into the BamHI site of the cloning vector pBR322 and transformed into Escherichia coli strain HB101 as mentioned in this paper.
Journal ArticleDOI
Managing Insect Resistance to Bacillus thuringiensis Toxins
W. H. McGaughey,Mark E. Whalon +1 more
TL;DR: Bacillus thuringiensis δ-endotoxins provide an alternative to chemical insecticides for controlling many species of pest insects and the discovery that insects can adapt to these toxins raises concerns about the long-term usefulness of B.t. toxins.
Journal ArticleDOI
Transfer of Bacillus thuringiensis plasmids coding for delta-endotoxin among strains of B. thuringiensis and B. cereus
TL;DR: Results demonstrate that the structural genes for the delta-endotoxin are plasmid borne, and transferred into two strains of the related species Bacillus cereus and yielded transcipients that produced crystals of the same antigenicity as the donor strain.
Journal ArticleDOI
Correlation between specific plasmids and delta-endotoxin production in Bacillus thuringiensis.
TL;DR: The evidence obtained supports the notion of a relationship between specific extrachromosomal DNA elements and δ-endotoxin production in B. thuringiensis, and suggests that in each strain only a single plasmid is involved, although the size of the implicated plasmids varies from one strain to another.
References
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Journal Article
Protein Measurement with the Folin Phenol Reagent
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Journal ArticleDOI
The reliability of molecular weight determinations by dodecyl sulfate-polyacrylamide gel electrophoresis
Klaus Weber,Mary Osborn +1 more
TL;DR: The results show that the polyacrylamide gel electrophoresis method can be used with great confidence to determine the molecular weights of polypeptide chains for a wide variety of proteins.
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A study of the conditions and mechanism of the diphenylamine reaction for the colorimetric estimation of deoxyribonucleic acid
TL;DR: The present study arose from the observation that a more intense colour was sometimes produced if, instead of being heated at 1000 for 10 min., the reaction mixture was allowed to stand overnight at room temperature.
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TL;DR: This chapter discusses the different aspects of thiobarbituric acid assay of sialic acid, which is suitable for measuring the release of bound sialoic acid by sialidase and hydrolysis of sIALic acid-containing material must be carried out for the measurement of total sialsic acids.
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