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A neighbour-exclusion intercalating model for poly(ADP-ribose) binding to DNA
Journal of Theoretical Biology
|December 7, 1983
Summary
Molecular modeling indicates poly(ADP-ribose) can bind DNA via poly-intercalation. This binding mechanism, where poly(ADP-ribose) fits into DNA's minor groove, may identify specific DNA binding sites.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Poly(ADP-ribose) (PAR) is a crucial post-translational modification involved in DNA repair and genome stability.
- Understanding the precise binding mechanisms of PAR to DNA is essential for elucidating its biological functions.
Purpose of the Study:
- To investigate the steric possibility and mode of poly-intercalative binding of poly(ADP-ribose) to DNA.
- To explore the potential of this binding mechanism for recognizing specific DNA structures.
Main Methods:
- Utilized molecular model building studies to simulate the interaction between poly(ADP-ribose) and DNA.
- Analyzed the spatial arrangement and potential binding modes based on steric constraints.
Main Results:
- Demonstrated that a poly-intercalative binding of poly(ADP-ribose) to DNA is sterically feasible.
- The proposed model positions poly(ADP-ribose) within the minor groove of DNA.
- Identified an adenine base intercalation in a neighbor-exclusion mode.
Conclusions:
- The poly-intercalative binding mode offers a plausible mechanism for how poly(ADP-ribose) interacts with DNA.
- This binding mechanism could serve as a basis for recognizing specific neighbor-exclusion intercalative sites on DNA.