ISSN:
1617-4623
Keywords:
Nucleoid protein H-NS (or H1a)
;
Regulation of transcription
;
Transcriptional repressor
;
Bacterial nucleoid
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Summary The Escherichia coli nucleoid protein, H-NS (or H1a), appears to influence the regulation of a variety of unrelated E. coli genes and operons. To gain an insight into the regulation of the has gene itself, we constructed in this study a has-lacZ transcriptional fusion gene and inserted a single copy at the attλ locus on the E. coli chromosome. Expression of hns transcription appeared to be moderately regulated in a growth phase-dependent manner. It also emerged that hns transcription is under negative autoregulation, at least in the logarithmic growth phase. The results of in vitro transcription experiments confirmed that H-NS functions as a repressor for its own transcription. Thus, H-NS was shown to exhibit relatively high affinity for the DNA sequence encompassing the hns promoter region, as compared with a non-specific sequence. These results support the view that the nucleoid protein, H-NS, can function as a transcriptional regulator.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00277109
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