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Related Experiment Videos

Mad1 function is regulated through elements within the carboxy terminus.

G Barrera-Hernandez1, C M Cultraro, S Pianetti

  • 1NCI-Navy Medicine Branch, Genetics Department, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20889-5105, USA.

Molecular and Cellular Biology
|May 29, 2000
PubMed
Summary
This summary is machine-generated.

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The carboxy terminus of Mad1 contains novel regulatory elements essential for its function. Deleting specific regions impairs growth inhibition and DNA binding, revealing a complex interplay for transcriptional repression.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • Myc and Mad proteins heterodimerize with Max, influencing transcription of Myc-responsive genes.
  • Myc-Max dimers activate transcription, while Mad-Max-mSin3 complexes repress it.
  • The N-terminal mSin3 binding domain and bHLH-LZ domain of Mad1 are crucial for proliferation-to-differentiation switching.

Purpose of the Study:

  • To identify and characterize novel regulatory motifs within the carboxy terminus (CT) of Mad1.
  • To investigate the role of specific C-terminal regions in Mad1's growth-inhibitory and differentiation-regulating functions.
  • To elucidate the interplay between different Mad1 domains in DNA binding and transcriptional repression.

Main Methods:

  • Site-directed mutagenesis to delete specific regions (Region V, Regions IV+V) of the Mad1 protein.

Related Experiment Videos

  • Assessment of Mad1 mutant protein function, including growth inhibition and reversal of Myc-imposed differentiation block.
  • Analysis of DNA binding affinity and Myc-dependent transcriptional repression activity of Mad1 mutants.

    • Main Results:

    • Deletion of the C-terminal 18 amino acids (Region V) abolished Mad1's growth-inhibitory function and its ability to reverse a differentiation block.
    • Removal of Region V resulted in weak DNA binding and loss of repression of Myc-dependent transcription.
    • Deletion of both Region IV (24 amino acids) and Region V restored DNA binding and transcriptional repression, suggesting functional interplay.
    • Phosphorylation within Region IV appears to mediate this interplay between Mad1 regions.

    Conclusions:

    • The carboxy terminus of Mad1 harbors previously unidentified regulatory elements critical for its function.
    • Specific C-terminal regions, particularly Region V, are essential for Mad1's role in growth control and differentiation.
    • A functional interplay exists between Mad1's central and C-terminal regions, regulated by phosphorylation, impacting DNA binding and transcriptional repression.