Importance of stereospecific positioning of the upstream cis-acting DNA element containing a curved DNA structure for the functioning of the Escherichia coli proV promoter.
The mechanism by which the Escherichia coli proV promoter is activated more than 100-fold in response to the medium osmolarity, without the help of any known trans-acting activators, is not yet fully understood. In this context, it has recently begun to be realized that structural features, not the primary sequences, of cis-acting DNA elements may be important for transcriptional regulation in prokaryotes. From this point of view, in this study the proV promoter was characterized by constructing a series of spacer-insertion mutants in a proV-lacZ fusion on the chromosome. Here it was found that the upstream cis-acting sequence must be positioned stereospecifically with respect to the principal -35 and -10 regions for the proV promoter to be fully activated. In this regard, it was suggested that an overall DNA structure, particularly DNA curvature, is an important cis-acting parameter for activation of the proV promoter.
Tanaka
K
K
Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Japan.
Ueguchi
C
C
Mizuno
T
T
D001426:Bacterial Proteins / Q000096:biosynthesis / Q000235:genetics; D001483:Base Sequence; D002352:Carrier Proteins / Q000096:biosynthesis / Q000235:genetics; D004269:DNA, Bacterial / Q000737:chemistry / Q000378:metabolism*; D004926:Escherichia coli / Q000235:genetics*; D029968:Escherichia coli Proteins; D015964:Gene Expression Regulation, Bacterial; D005798:Genes, Bacterial; D026901:Membrane Transport Proteins; D008969:Molecular Sequence Data; D016254:Mutagenesis, Insertional; D009690:Nucleic Acid Conformation; D033902:Periplasmic Binding Proteins; D011401:Promoter Regions, Genetic; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis; D015183:Restriction Mapping; D001616:beta-Galactosidase / Q000096:biosynthesis / Q000235:genetics
D001426:Bacterial Proteins; D002352:Carrier Proteins; D004269:DNA, Bacterial; D029968:Escherichia coli Proteins; D026901:Membrane Transport Proteins; C053437:PROX protein, E coli; D033902:Periplasmic Binding Proteins; D011993:Recombinant Fusion Proteins; D001616:beta-Galactosidase