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Related Experiment Videos

[Leu5]enkephalin-encoding sequences are targets for a specific DNA-binding factor

G Bakalkin1, M Telkov, T Yakovleva

  • 1Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.

Proceedings of the National Academy of Sciences of the United States of America
|September 26, 1995
PubMed
Summary
This summary is machine-generated.

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Researchers identified a novel DNA-binding factor, [Leu5]enkephalin-encoding sequence DNA-binding factor (LEF), that specifically binds to [Leu5]enkephalin sequences in key genes. LEF regulates gene transcription, suggesting a role in opioid peptide gene expression.

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Genetics

Background:

  • Opioid peptides like enkephalins are crucial neurotransmitters.
  • Prodynorphin and proenkephalin genes encode enkephalins, but their regulatory mechanisms are not fully understood.

Purpose of the Study:

  • To characterize a DNA-binding factor specific for [Leu5]enkephalin-encoding sequences.
  • To investigate the functional role of this factor in gene regulation.

Main Methods:

  • DNA-binding assays to determine factor specificity and affinity.
  • Identification of factor subunits and localization.
  • Reporter gene assays to assess transcriptional regulation.

Main Results:

  • A novel DNA-binding factor, named [Leu5]enkephalin-encoding sequence DNA-binding factor (LEF), was identified.

Related Experiment Videos

  • LEF exhibits high affinity and specificity for [Leu5]enkephalin sequences in prodynorphin and proenkephalin genes, but not for [Met5]-enkephalin sequences.
  • LEF, a multi-subunit nuclear factor, was found in various rat tissues and human cell lines, with higher levels in embryonic stages.
  • LEF inhibited transcription when [Leu5]enkephalin sequences were placed upstream of reporter genes.

    • Conclusions:

    • [Leu5]enkephalin-encoding sequences possess regulatory functions mediated by the specific DNA-binding factor LEF.
    • LEF plays a role in the transcriptional regulation of prodynorphin and proenkephalin genes.
    • The discovery of LEF provides new insights into the complex regulation of opioid peptide gene expression.