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Inorganic phosphate regulates CryIVA protoxin expression in Bacillus thuringiensis israelensis.

Abstract：

:The role of nutritional factors during CryIVA protoxin expression in Bacillus thuringiensis israelensis (Bti) has been investigated. Inorganic phosphate (Pi) was found to stimulate 135 kD protoxin synthesis by Bti cells. There was a corresponding increase in the cryIVA specific mRNA in the presence of Pi. Inorganic phosphate inhibited HPr kinase but activated HPr phosphatase, the two enzymes responsible for regulating the concentration of phosphorylated HPr in the cell. Addition of protein phosphatase inhibitors NaF and calyculin A during resuspension resulted in the inhibition of toxin synthesis by Bti cells. Calyculin A inhibited HPr phosphatase activity in the in vitro assay also. The concentration of phosphorylated HPr was upregulated when the cells were resuspended in the presence of calyculin A, while the levels of the same were lowered in the presence of Pi, as determined by Western blotting the respective cells. The efficiency of sporulation of Bti was not affected when Pi was added alone or along with the phosphatase inhibitor calyculin A.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Banerjee-Bhatnagar N

doi

10.1006/bbrc.1999.1094

subject

Has Abstract

pub_date

1999-08-27 00:00:00

pages

359-64

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(99)91094-X

journal_volume

262

pub_type

杂志文章

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