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. 1993 Aug;59(8):2404–2410. doi: 10.1128/aem.59.8.2404-2410.1993

Effect of promoter modification on mosquitocidal cryIVB gene expression in Synechococcus sp. strain PCC 7942.

E Soltes-Rak 1, D J Kushner 1, D D Williams 1, J R Coleman 1
PMCID: PMC182298  PMID: 7690220

Abstract

The impact of promoter modification on the expression of the mosquitocidal Bacillus thuringiensis subsp. israelensis cryIVB gene when used to transform the cyanobacterium Synechococcus sp. strain PCC 7942 has been examined. Maximal transcript and protein abundances were achieved by the addition of the lacZ promoter upstream of the cryIVB sequence. Replacement of the endogenous corresponding Bacillus sequences with the Synechococcus petF1 promoter, ribosome binding site, and initiation codon also resulted in increased expression of the cryIVB gene relative to the expression obtained with the Bacillus promoter alone but decreased expression relative to the expression achieved with the tandem array of the Bacillus and lacZ promoters. Synechococcus cells carrying plasmids in which the expression of the cryIVB gene was regulated by either the lacZ or the petF1 promoter were readily consumed by first-instar Culex restuans larvae and proved to be toxic for these organisms.

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