Open Access
Construction of a vector for the study of regulatory mechanism of gene expression and its utilization in the melibiose operon of Escherichia coli.
Toshi Shimamoto,K Noguchi,M Kuroda,M Tsuda,T Tsuchiya +4 more
- Iss: 19, pp 171-173
TLDR
A vector constructed to evaluate terminator or attenuator of transcription quantitatively is a plasmid possessing lac promoter-polylinker-CAT(chloramphenicol acetyltransferase) gene, and it is found that a DNA fragment containing a large stem-loop structure with boxA sequence in it caused strong reduction of gene expression.Abstract:
We constructed a vector to evaluate terminator or attenuator of transcription quantitatively. This vector is a plasmid possessing lac promoter-polylinker-CAT(chloramphenicol acetyltransferase) gene. DNA fragment of interest can be inserted into the polylinker site, and the effect of the DNA fragment on the expression of the downstream gene is evaluated from the CAT activity. We analyzed gene expression of the melibiose operon of Escherichia coli using this plasmid, and found that a DNA fragment containing a large stem-loop structure with boxA sequence in it, which was present between melA and melB, caused strong reduction of gene expression. This DNA portion seems to be responsible for reduced expression of melB, the second gene of the melibiose operon.read more
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An upstream regulatory sequence stimulates expression of the perfringolysin O gene of Clostridium perfringens.
TL;DR: Results indicate that pfoR positively controls expression of the pfoA gene, a thiol-activated hemolysin of Clostridium perfringens, which possesses several motifs that are characteristic of DNA-binding proteins.
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Role of the upstream region containing an intrinsic DNA curvature in the negative regulation of the phospholipase C gene of Clostridium perfringens.
TL;DR: The results indicate that the intrinsic DNA curvature upstream of the plc promoter is involved in the negative regulation of theplc gene transcription.
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