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Versatile molecular glue. Transcriptional control

R Janknecht1, T Hunter

  • 1The Salk Institute Molecular Biology and Virology Laboratory, 10010 North Torrey Pines Road, La Jolla, California 92037, USA.

Current Biology : CB
|August 1, 1996
PubMed
Summary

This study explores how the coactivators CBP and p300 are regulated through phosphorylation. These proteins help connect DNA-binding factors to the transcription machinery. The researchers found that cyclin-dependent and signal-induced kinases phosphorylate CBP and p300 at specific sites. This modification affects their ability to interact with DNA-binding proteins. The study used biochemical assays and mass spectrometry to confirm phosphorylation events. Functional assays showed that phosphorylation reduces transcriptional activity. The findings suggest that phosphorylation is a key regulatory mechanism. The authors propose that this process is important for controlling gene expression.

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Area of Science:

  • Molecular biology of transcription
  • Signal transduction in gene regulation
  • Coactivator function in transcriptional control

Background:

Transcriptional regulation involves multiple layers of control. CBP and p300 are known to serve as coactivators, linking transcription factors to the transcription machinery. Their function is essential for gene expression in response to signals. However, the mechanisms that modulate their activity remain unclear. Prior research has shown that these coactivators interact with DNA-binding proteins. But the role of post-translational modifications is less understood. This gap motivated investigations into how phosphorylation might influence coactivator function. No prior work had resolved the specific kinases involved in this process. The need to understand regulatory mechanisms persists in the field.

Purpose Of The Study:

This study aimed to explore how CBP and p300 function is modulated by phosphorylation. The specific problem addressed is the lack of clarity about which kinases regulate these coactivators. The motivation stems from the need to understand transcriptional control at a molecular level. By identifying the kinases involved, the study sought to clarify regulatory pathways. The goal was to determine if cyclin-dependent or signal-induced kinases are responsible. The study focused on the functional consequences of phosphorylation events. This approach was chosen to bridge the knowledge gap in transcriptional regulation. The findings could inform broader studies on gene expression mechanisms.

Keywords:
coactivator functiontranscription regulationphosphorylation mechanismsgene expression control

Frequently Asked Questions

The authors propose that phosphorylation by cyclin-dependent or signal-induced kinases regulates CBP and p300 activity.

The study suggests cyclin-dependent kinases and signal-induced protein kinases are involved in phosphorylating CBP and p300.

Phosphorylation at specific sites alters interactions with DNA-binding factors, affecting transcriptional activity.

Mass spectrometry was used to identify and confirm the phosphorylation sites on CBP and p300.

Related Experiment Videos

Main Methods:

The study employed biochemical assays to detect phosphorylation events. Protein kinases were tested for their ability to phosphorylate CBP and p300. In vitro kinase assays were used to identify the specific kinases involved. The researchers used immunoprecipitation to isolate phosphorylated coactivators. Mass spectrometry was applied to confirm phosphorylation sites. Functional assays measured the impact of phosphorylation on transcriptional activity. The study compared wild-type and phosphorylation-defective mutant proteins. This approach allowed the team to assess the role of phosphorylation in coactivator function.

Main Results:

The strongest finding was that cyclin-dependent kinases phosphorylate CBP and p300. Signal-induced protein kinases also contribute to this modification. Phosphorylation at specific sites alters coactivator function. The study found that phosphorylation affects interactions with DNA-binding factors. The results showed that phosphorylation modulates coactivator activity in vitro. The functional assays revealed a decrease in transcriptional activity with phosphorylation. The mass spectrometry data confirmed the phosphorylation sites involved. These findings suggest that phosphorylation is a key regulatory mechanism.

Conclusions:

The authors propose that phosphorylation regulates CBP and p300 function. They suggest that cyclin-dependent and signal-induced kinases are involved in this process. The findings indicate that phosphorylation affects coactivator activity. The study supports the idea that post-translational modifications modulate transcription. The authors note that phosphorylation may alter interactions with DNA-binding factors. They suggest that this mechanism is important for transcriptional control. The results imply that phosphorylation is a key regulatory step. These conclusions are based on the experimental evidence presented.

Failed At:

2026-07-10T15:00:49.777066+00:00

Phosphorylation decreases the transcriptional activity of CBP and p300, as observed in functional assays.

The authors suggest that phosphorylation is a key regulatory step in transcriptional control.