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Post-transcriptional control of the cyanobacterial hspA heat-shock induction.

Abstract：

:The hspA gene encodes a small heat-shock protein in the thermophilic cyanobacterium Synechococcus vulcanus. To gain insight into the post-transcriptional regulation, hspA was expressed in Escherichia coli. HspA was induced upon a temperature upshift from 30 to 42 degrees C, although the hspA transcription in E. coli occurred constitutively at both 30 and 42 degrees C. Neither replacement of the native hspA promoter with the lacZ promoter nor the addition of rifampin abolished the heat induction. Thus, the primary form of regulation of the heat induction is at the post-transcriptional level. Analyses of expression of a series of the transcriptional and translational hspA-lacZ fusions confirmed the constitutive transcription, and demonstrated that the heat induction occurred only in the translational fusions. They further indicated the presence of regulatory elements involved in the translational regulation. An element in the 5'-untranslated region of the hspA mRNA suppressed the translation, while that in the hspA coding region was required for the de-repression of the translation and for thermal regulation.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Kojima K,Nakamoto H

doi

10.1016/j.bbrc.2005.04.009

subject

Has Abstract

pub_date

2005-06-03 00:00:00

pages

583-8

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(05)00760-6

journal_volume

331

pub_type

杂志文章

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