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A strong promoter of a non-cry gene directs expression of the cry1Ac gene in Bacillus thuringiensis.

Abstract：

:Bacillus thuringiensis bacteria show insecticidal activities that rely upon the production of insecticidal crystal proteins, which are encoded by cry or cyt genes and can target a variety of insect pests. It has been shown that cry1Ac is the only cry gene in B. thuringiensis subsp. kurstaki HD73 (B. thuringiensis HD73) and its expression is controlled by both σE and σK. Here, we report a novel σE-dependent strong promoter of a non-cry gene (HD73_5014), which can direct strong cry1Ac gene expression in B. thuringiensis HD73. We constructed an E. coli-B. thuringiensis shuttle vector (pHT315-P 5014 -1Ac) for cry1Ac gene expression, using the HD73_5014 gene promoter. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis and western blot analysis showed that expression of the cry1Ac gene directed by the HD73_5014 gene promoter was at the same level as that directed by the previously known strongest cry promoter, P cry8E . However, this strain did not form typical bipyramidal crystals in mother cells, as observed by transmission electron microscopy and atomic force microscope. The strain with Cry1Ac protein expression under the control of the HD73_5014 gene promoter (P 5014 -cry1Ac) showed insecticidal activity against Plutella xylostella similar to that under the control of the orf1cry8E gene promoter (P cry8E -cry1Ac). Collectively, these results suggest that the HD73_5014 gene promoter, as a non-cry gene promoter, would be an efficient transcriptional element for cry gene expression. These data also show the possibility for improving Cry production by searching for transcriptional elements in not only cry genes, but also non-cry genes.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Zhang X,Gao T,Peng Q,Song L,Zhang J,Chai Y,Sun D,Song F

doi

10.1007/s00253-018-8836-5

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

3687-3699

issue

8

eissn

0175-7598

issn

1432-0614

pii

10.1007/s00253-018-8836-5

journal_volume

102

pub_type

杂志文章

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