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Replication of a cis-syn thymine dimer at atomic resolution.

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Ultraviolet light causes DNA damage via cyclobutane pyrimidine dimers (CPDs). The Y-family DNA polymerase eta (pol eta) bypasses these lesions, and its structure was elucidated using Dpo4, an archaeal homolog.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Ultraviolet (UV) radiation induces DNA damage, primarily forming cis-syn cyclobutane pyrimidine dimers (CPDs).
  • CPDs impede DNA replication by high-fidelity polymerases, necessitating specialized bypass mechanisms.
  • Defects in the gene encoding DNA polymerase eta (POLH) are linked to xeroderma pigmentosum, a disease causing extreme sun sensitivity and skin cancer predisposition.

Purpose of the Study:

  • To elucidate the structural basis of how Y-family DNA polymerase eta bypasses cyclobutane pyrimidine dimers (CPDs).
  • To understand the mechanism of DNA repair and replication bypass of UV-induced DNA lesions.

Main Methods:

  • Determined two crystal structures of Dpo4, an archaeal homolog of pol eta, in complex with CPD-containing DNA.
  • Analyzed the interactions between Dpo4, CPDs, and incoming nucleotides.

Main Results:

  • The 3' thymine of the CPD templated a Watson-Crick base pair with dideoxyATP.
  • The 5' thymine of the CPD templated a Hoogsteen base pair with dideoxyATP in the syn conformation.
  • Dpo4's active site accommodates these unusual DNA structures for catalysis.

Conclusions:

  • Dpo4's structure provides insights into the mechanism of CPD bypass by Y-family polymerases.
  • A model of the pol eta-CPD complex suggests unique structural features enabling efficient CPD bypass.
  • Understanding pol eta's function is crucial for comprehending DNA repair and preventing UV-induced mutagenesis.