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Related Experiment Videos

Cyclic AMP receptor proteins interacts with lactose operator DNA.

A Schmitz

    Nucleic Acids Research
    |January 24, 1981
    PubMed
    Summary

    Researchers reinvestigated the E. coli lac promoter-operator region for cyclic AMP receptor protein (CRP) binding sites. Two distinct CRP interaction sites were identified, including a newly found site overlapping the lac operator.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • The lac promoter-operator region in E. coli is crucial for regulating lactose metabolism.
    • Cyclic AMP receptor protein (CRP) is a key transcriptional activator that binds to specific DNA sequences.
    • Previous studies identified one CRP binding site in the -60 region of the lac promoter.

    Purpose of the Study:

    • To re-examine the wildtype lac promoter-operator region of E. coli for cyclic AMP receptor protein (CRP) binding sites.
    • To precisely map the locations and characteristics of CRP interaction sites within this regulatory region.

    Main Methods:

    • Utilized the DNA 'footprinting' technique to identify protein-DNA interactions.
    • Analyzed DNase I enhanced cutting sites to delineate CRP binding regions.

    Main Results:

    • Identified two distinct CRP interaction sites within the lac promoter-operator region.
    • Confirmed a previously described CRP binding site in the -60 base pair region.
    • Discovered a second CRP binding site that spans the lac operator sequence.

    Conclusions:

    • The lac promoter-operator region possesses at least two distinct binding sites for CRP.
    • These two sites share similarities in their physical extent, orientation, and characteristic DNase I cutting patterns.
    • This finding refines our understanding of CRP-mediated transcriptional regulation of the lac operon.

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