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A temperature-induced narrow DNA curvature range sustains the maximum activity of a bacterial promoter in vitro.

Abstract：

:Among the molecular strategies bacteria have set up to quickly match their transcriptional program to new environments, changes in sequence-mediated DNA curvature play a crucial role. Bacterial promoters, especially those of mesophilic bacteria, are in general preceded by a curved region. The marked thermosensitivity of curved DNA stretches allows bacteria to rapidly sense outer temperature variations and affects transcription by favoring the binding of activators or repressors. Curved DNA is also able to influence the transcriptional activity of a bacterial promoter directly, without the involvement of trans-acting regulators. This study attempts to quantitatively analyze the role of DNA curvature in thermoregulated gene expression using a real-time in vitro transcription model system based on a specific fluorescence molecular beacon. By analyzing the temperature-dependent expression of a reporter gene in a construct carrying a progressively decreasing bent sequence upstream from the promoter, we show that with a decrease in temperature a narrow curvature range accounts for a significant enhancement of promoter activity. This strengthens the view that DNA curvature-mediated regulation of gene expression is likely a strategy offering fine-tuning control possibilities and that, considering the widespread presence of curved sequences upstream from bacterial promoters, it may represent one of the most primitive forms of gene regulation.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Prosseda G,Mazzola A,Di Martino ML,Tielker D,Micheli G,Colonna B

doi

10.1021/bi902003g

subject

Has Abstract

pub_date

2010-04-06 00:00:00

pages

2778-85

issue

13

eissn

0006-2960

issn

1520-4995

journal_volume

49

pub_type

杂志文章

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