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Related Experiment Videos

The chymotrypsin enhancer core. Specific factor binding and biological activity.

A Meister1, S L Weinrich, C Nelson

  • 1Hormone Research Institute, San Francisco, California.

The Journal of Biological Chemistry
|December 5, 1989
PubMed
Summary
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Researchers identified specific DNA-binding factors, CACCTG pan-1 and TTTCCC pan-1, crucial for activating gene expression in pancreatic acinar cells. These factors cooperate to regulate gene transcription, with an MLTF-like factor potentially inhibiting this process.

Area of Science:

  • Molecular biology
  • Gene regulation
  • Pancreatic cell function

Background:

  • A conserved 20-base pair sequence in the 5'-flanking regions of highly expressed pancreatic exocrine genes acts as an enhancer.
  • This sequence is critical for the function of rat amylase 2A, chymotrypsin B, and elastase I gene enhancers.

Purpose of the Study:

  • To identify and characterize factors that interact with the conserved enhancer sequence in the rat chymotrypsin B gene.
  • To elucidate the role of these factors in transcriptional activation within pancreatic acinar cells.

Main Methods:

  • In vitro detection of DNA-binding factors in acinar cell extracts.
  • Transfection experiments to assess enhancer activity.
  • DNase I protection assays to locate binding sites.

Related Experiment Videos

  • In vitro competition binding and methylation interference analyses to characterize protein-DNA interactions.

    • Main Results:

    • Acinar cell extracts contain factors that bind the conserved DNA sequence, acting as transcriptional activators.
    • Two distinct binding sites, 10 base pairs apart, suggest cooperative binding of multiple factors (CACCTG pan-1 and TTTCCC pan-1).
    • An MLTF-like factor cross-reacts with CACCTG pan-1 but does not correlate with enhancer activity and may act as an inhibitor.

    Conclusions:

    • Cooperative binding of at least two factors (CACCTG pan-1 and TTTCCC pan-1) is essential for regulating chymotrypsin B gene transcription in pancreatic acinar cells.
    • The identified factors are critical transcriptional activators, distinct from the MLTF-like factor which may inhibit enhancer function.