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Related Experiment Videos

ATP-dependent chromatin structural modulation by multiprotein complex including HMGB1.

Masamichi Yamada1, Tetsuya Ueda, Koichi Sato

  • 1Department of Biological Science and Technology, Science University of Tokyo, Yamazaki, Noda-shi, Chiba 278-8510.

Journal of Biochemistry
|March 5, 2004
PubMed
Summary
This summary is machine-generated.

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High mobility group box protein 1 (HMGB1) interacts with a multiprotein complex to modulate chromatin structure. This interaction is crucial for HMGB1

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • High mobility group box protein 1 (HMGB1) is a key nonhistone chromatin protein in eukaryotes.
  • HMGB1's role in nuclear processes like transcription, recombination, and repair is established, but its precise mechanism remains unclear.
  • Understanding HMGB1's function is vital for elucidating global nuclear event regulation.

Purpose of the Study:

  • To investigate the mechanism of chromatin structural modulation by HMGB1.
  • To identify specific interactions and complexes involving HMGB1 in mammalian cells.
  • To determine if HMGB1 functions independently or as part of a larger complex in chromatin modulation.

Main Methods:

  • Co-immunopurification using Flag-tagged HMGB1 in HeLa S3 cells.

Related Experiment Videos

  • Biochemical assays to assess ATP hydrolysis and chromatin structural modulation activities.
  • Micrococcal nuclease (MNase) digestion to evaluate chromatin accessibility.

    • Main Results:

    • A significant portion of HMGB1 in HeLa S3 cells exists within a large-molecular-weight multiprotein complex.
    • This HMGB1-containing multiprotein complex exhibits ATP hydrolysis and ATP-dependent chromatin structural modulation.
    • The complex's activity increases chromatin susceptibility to MNase digestion, an effect not observed with HMGB1 alone.

    Conclusions:

    • HMGB1's chromatin structural modulation activity is dependent on its association with a multiprotein complex.
    • HMGB1 likely plays a critical role in regulating global nuclear events through this complex.
    • These findings provide a concrete example of HMGB1-mediated chromatin modulation in mammalian cells.