Structural Similarity Between the Lepidoptera- and Diptera-specific Insecticidal Endotoxin Genes of Bacillus Thuringiensis Subsp. "kurstaki" and "israelensis"

Overview

Journal J Bacteriol

Publisher American Society for Microbiology

Specialty Microbiology

Date 1986 Jun 1

PMID 3011746

Citations 50

Authors

L Thorne

F Garduno

T Thompson

D Decker

M Zounes

M Wild

A M Walfield

T J Pollock

Affiliations

Soon will be listed here.

Abstract

A gene from Bacillus thuringiensis subsp. "israelensis" was cloned from the large plasmids of this subspecies and was shown to code for a mosquitocidal polypeptide. The gene could be expressed in either Escherichia coli, Bacillus subtilis, or B. thuringiensis subsp. "israelensis" to produce the larvicidal activity. Similarly, a Lepidoptera-specific toxin gene from B. thuringiensis subsp. "kurstaki" was also cloned and expressed in E. coli and B. subtilis. Both cloned genes were sequenced and subjected to computer analysis. A long open translational reading frame coded for the B. thuringiensis subsp. "kurstaki" gene product. However, the B. thuringiensis subsp. "israelensis" clone was composed of two adjacent open reading frames oriented as if they were in a transcriptional operon. The products of the cloned genes retained their specificity for either Lepidoptera or Diptera. The control regions immediately preceding the toxin genes of both B. thuringiensis subspecies showed considerable DNA homology, most likely because both toxins are expressed only during sporulation. In addition, the deduced amino acid sequences from the two contiguous B. thuringiensis subsp. "israelensis" genes bore a striking resemblance to the deduced amino acid sequence from the single larger B. thuringiensis subsp. "kurstaki" gene, as if these two arrangements were evolutionarily related.

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