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Area of Science:

  • Molecular Biology
  • Genetics
  • Structural Biology

Background:

  • Genome stability relies on efficient DNA repair mechanisms.
  • Single-stranded DNA binding proteins (SSBs) are vital for DNA replication, recombination, and repair.
  • Human single-stranded DNA binding protein 1 (hSSB1) is known for its role in double-strand break (DSB) repair and is now implicated in base excision repair (BER).

Purpose of the Study:

  • To elucidate the structural basis of hSSB1 self-oligomerization, particularly under oxidizing conditions relevant to BER.
  • To understand how hSSB1 oligomerization impacts its function in both BER and DSB repair pathways.

Main Methods:

  • Solution-state Nuclear Magnetic Resonance (NMR) spectroscopy.
  • Biophysical assays.
  • Functional experiments assessing DNA repair activities.

Main Results:

  • hSSB1 forms a stable tetramer, structurally analogous to bacterial SSBs.
  • Oligomerization is stabilized by specific cysteine residues (C81, C99) and a combination of charged and hydrophobic interactions.
  • hSSB1 tetramer formation is essential for its function in base excision repair (BER) following oxidative DNA damage.
  • Oligomerization does not impede hSSB1's role in double-strand break (DSB) repair, evidenced by its interaction with Ints3 (SOSS1 complex).

Conclusions:

  • hSSB1 self-oligomerization into a tetramer is a key mechanism for its function in base excision repair (BER).
  • The ability of hSSB1 to oligomerize and interact with other repair factors highlights its versatile role in maintaining genome integrity.
  • Structural insights into hSSB1 oligomerization provide a foundation for understanding its multifaceted functions in DNA repair.