The DNA-Binding Domain of Human PARP-1 Interacts with DNA Single-Strand Breaks as a Monomer through Its Second Zinc Finger
2011
How PARP-1 Recognizes DNA Damage
publication
Evidence: high
Author Information
Author(s): Eustermann Sebastian, Videler Hortense, Yang Ji-Chun, Cole Paul T., Gruszka Dominika, Veprintsev Dmitry, Neuhaus David
Primary Institution: MRC Laboratory of Molecular Biology, Cambridge, UK
Hypothesis
The study investigates how the two zinc fingers of PARP-1 interact with DNA single-strand breaks.
Conclusion
The second zinc finger of PARP-1 is primarily responsible for recognizing DNA single-strand breaks.
Supporting Evidence
- PARP-1 zinc fingers 1 and 2 are structurally independent in the free state.
- PARP-1 fingers 1 + 2 form a 1:1 monomeric complex with DNA single-strand breaks.
- PARP-1 fingers 1 + 2 recognize different types of DNA single-strand break similarly.
- DNA damage recognition by PARP-1 occurs predominantly through finger 2.
Takeaway
PARP-1 has two parts that help it find and fix broken DNA, and one part is much better at this job than the other.
Methodology
The study used NMR spectroscopy, fluorescence measurements, analytical ultracentrifugation, and electrophoretic gel mobility assays to analyze the interaction of PARP-1 with DNA.
Digital Object Identifier (DOI)
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