Effects of Bacillus thuringiensis var. israelensis 20-kDa protein on production of the Bti 130-kDa crystal protein in Escherichia coli.
A 20-kDa protein of Bacillus thuringiensis var. israelensis (Bti) has been shown to be necessary for the efficient expression of the 27-kDa mosquitocidal protein gene in Escherichia coli. We have investigated the effects of this 20-kDa protein on the expression of two 130-kDa mosquitocidal protein genes (cryIVA, cryIVB) in E. coli by supplying the 20-kDa protein gene in trans. When a recombinant plasmid, pLH4BX, which was constructed to express cryIVA under the E. coli lac promoter on pUC19, coexisted with the 20-kDa protein gene, a striking increase in production of the fused CryIVA was detected. This was not accompanied by an increase in the amount of intracellular mRNA, suggesting that 20-kDa protein exerts a posttranscriptional effect. We conclude that the 20-kDa protein also stimulates the production of 130-kDa protein in E. coli.
Department of Agricultural Chemistry, Kyoto University, Japan.
H
H
Yoshisue
K
K
Yoshida
K
K
Sen
H
H
Sakai
T
T
Komano
D000595:Amino Acid Sequence; D001413:Bacillus thuringiensis / Q000235:genetics / Q000378:metabolism*; D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000494:pharmacology*; D001427:Bacterial Toxins; D001483:Base Sequence; D003001:Cloning, Molecular; D004731:Endotoxins; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D005798:Genes, Bacterial / Q000502:physiology; D006460:Hemolysin Proteins; D008969:Molecular Sequence Data
D000083722:Bacillus thuringiensis Toxins; D001426:Bacterial Proteins; D001427:Bacterial Toxins; D004731:Endotoxins; D006460:Hemolysin Proteins; C030956:insecticidal crystal protein, Bacillus Thuringiensis; C078117:20 kDa protein, Bacillus thuringiensis