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Related Experiment Videos

DNA binding specificity of the basic-helix-loop-helix protein MASH-1

D Meierhan1, C el-Ariss, M Neuenschwander

  • 1Department of Chemistry, ETH-Zurich, Switzerland.

Biochemistry
|September 5, 1995
PubMed
Summary

MASH-1, a basic-helix-loop-helix (BHLH) protein, binds DNA with high affinity but low specificity, similar to MyoD. Differences in their biological roles are not explained by DNA binding alone.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Protein-DNA Interactions

Background:

  • Basic-helix-loop-helix (BHLH) proteins MASH-1 and MyoD, despite sequence similarity, have distinct biological functions.
  • Understanding DNA binding specificity differences is crucial for elucidating their varied roles.

Purpose of the Study:

  • To investigate the DNA binding properties and specificity of the MASH-1 protein.
  • To compare MASH-1's DNA binding characteristics with those of MyoD.

Main Methods:

  • Circular dichroism (CD) spectroscopy to analyze protein conformational changes.
  • Electrophoretic mobility shift assays (EMSA) to determine DNA binding affinity and specificity.

Main Results:

  • MASH-1's BHLH domain undergoes a sequence-independent conformational change to an alpha-helical form upon DNA binding.

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  • MASH-1 exhibits high-affinity (KD = 1.4-4.1 x 10(-14) M2) dimeric binding to E-box DNA sequences.
  • DNA binding specificity of MASH-1 is low, with only a tenfold difference between high-affinity and unrelated sequences.
  • Heterodimerization with E12 did not significantly enhance MASH-1's DNA binding specificity.
  • MASH-1 and MyoD show similar binding site preferences.

    • Conclusions:

    • Differential DNA binding is unlikely to be the sole reason for the distinct target gene specificities of MASH-1 and MyoD.
    • The findings suggest that other factors, potentially related to the crystal structure of MyoD's BHLH domain, contribute to their functional divergence.