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Related Experiment Videos

Similarities between prokaryotic and eukaryotic cyclic AMP-responsive promoter elements.

Y S Lin1, M R Green

  • 1Department of Biochemistry and Molecular Biology, Harvard University, Cambridge, Massachusetts 02138.

Nature
|August 24, 1989
PubMed
Summary

This study reveals functional links between bacterial and mammalian cyclic AMP (cAMP) response elements. Mammalian ATF and bacterial CAP proteins can bind to each other's DNA sites, demonstrating conserved gene regulation mechanisms.

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Area of Science:

  • Molecular Biology
  • Gene Regulation
  • Comparative Genomics

Background:

  • Cyclic AMP (cAMP) regulates gene transcription in diverse organisms, including bacteria and mammals.
  • This regulation is mediated by specific DNA sequences called promoter elements.
  • In Escherichia coli, the cAMP receptor protein (CAP) binds these elements; in mammals, ATF proteins are involved.

Purpose of the Study:

  • To investigate functional relationships between prokaryotic (E. coli) and mammalian cAMP-response elements.
  • To determine if transcription factors from one species can interact with response elements from another.

Main Methods:

  • Electrophoretic mobility shift assays (EMSAs) to test protein-DNA binding specificity.
  • Transfection assays in mammalian cells to assess the functional activity of bacterial promoter elements.

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Main Results:

  • Mammalian ATF proteins demonstrated specific binding to some E. coli CAP binding sites.
  • Conversely, E. coli CAP protein specifically bound to some mammalian ATF binding sites.
  • An E. coli CAP binding site conferred cAMP-inducibility to a mammalian gene in transfected cells.

Conclusions:

  • Prokaryotic and mammalian cAMP-response elements share functional similarities.
  • Cross-species binding of transcription factors (ATF and CAP) to DNA sites suggests conserved regulatory mechanisms.
  • Bacterial cAMP-response elements can function in mammalian gene regulation.