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Related Experiment Videos

Modular structure of cAMP response element binding protein 2 (CREB2).

S Schoch1, G Cibelli, A Magin

  • 1Institute for Genetics, University of Cologne, D-50674 Cologne, Germany.

Neurochemistry International
|April 6, 2001
PubMed
Summary

CREB2 protein may act as a transcriptional activator, not just a repressor of long-term memory. Molecular analysis reveals CREB2 has an activation domain, challenging its sole role as a memory repressor.

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Area of Science:

  • Molecular Biology
  • Neuroscience
  • Gene Regulation

Background:

  • CREB2 (cAMP-response element binding protein 2) is a transcription factor implicated in long-term memory repression.
  • CREB2 belongs to the basic region leucine zipper family of proteins.

Purpose of the Study:

  • To investigate the transcriptional regulatory role of CREB2.
  • To determine if CREB2 functions solely as a repressor or possesses other regulatory activities.

Main Methods:

  • In vitro binding assays using recombinant CREB2 and DNA elements.
  • Analysis of CREB2's ability to repress transcription using model promoters.
  • Molecular dissection of CREB2 to identify functional domains.
  • Reporter gene assays with fusion proteins.

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Main Results:

  • CREB2 binds to the cAMP response element of the secretogranin II gene.
  • CREB2 represses cAMP-induced transcription of specific genes.
  • CREB2 lacks a transferable repressor domain, suggesting a 'passive' repression mechanism.
  • An N-terminal activation domain was identified in CREB2.

Conclusions:

  • CREB2's role in transcriptional regulation is more complex than previously thought.
  • CREB2 may function as both a transcriptional repressor and activator.
  • The identified activation domain suggests CREB2 can influence gene expression through different mechanisms.