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Histone tail electrostatics modulate E2-E3 enzyme dynamics: a gateway to regulate ubiquitination machinery.

Dineli T S Ranathunga1, Hedieh Torabifard1

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Molecular dynamics simulations reveal how BRCA1/BARD1-UbcH5c ubiquitylation of the H2A C-tail impacts cancer. This study elucidates the mechanism of H2A C-tail ubiquitylation, crucial for genomic stability and cancer treatment development.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • BRCA1 (Breast Cancer-Associated Protein 1) is a tumor suppressor crucial for genomic stability and DNA repair.
  • BRCA1 functions as an E3 ubiquitin ligase, with its activity enhanced by heterodimerization with BARD1 (BRCA1-associated RING domain protein 1).
  • Mutations in the nucleosomal H2A C-terminal tail's ubiquitination by BRCA1/BARD1-UbcH5c are linked to chromosomal instability and increased cancer risk.

Purpose of the Study:

  • To provide molecular-level insights into the dynamics of the H2A C-tail and BRCA1/BARD1-UbcH5c complex on the nucleosome.
  • To elucidate the mechanism of H2A C-tail ubiquitination by BRCA1/BARD1-UbcH5c.
  • To understand the role of H2A C-tail ubiquitination in cancer susceptibility and its regulation.

Main Methods:

  • Molecular dynamics simulations were employed to study the interactions and dynamics of the H2A C-tail and BRCA1/BARD1-UbcH5c complex.
  • Analysis focused on identifying key residues and interactions governing conformational transitions and ubiquitination.
  • Histone electrostatics' role in the dynamics of the complex was characterized.

Main Results:

  • Key interactions and residues triggering conformational transitions in BRCA1/BARD1-UbcH5c were precisely identified.
  • The significant role of histone electrostatics in the dynamics of the complex was characterized.
  • A mechanistic basis for H2A C-tail lysine approach to UbcH5c was provided, highlighting the role of dynamics in ubiquitination.

Conclusions:

  • The study provides unprecedented molecular-level insights into H2A C-tail ubiquitination by BRCA1/BARD1-UbcH5c.
  • Findings elucidate the communication between ubiquitin ligase (E3) and conjugating enzymes (E2) with the nucleosome.
  • Understanding this mechanism offers potential for developing novel cancer and chronic pain treatments.