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A unified DNA- and dNTP-binding mode for DNA polymerases
1Dept of Biochemistry and Molecular Biology, UMD-New Jersey Medical School, Newark 07103, USA.
Trends in Biochemical Sciences
|October 3, 1998
Summary
This study resolves the DNA orientation debate in DNA polymerases. A new superposition scheme reveals a common DNA-binding mode across all polymerases, including polymerase beta.
Area of Science:
- Molecular Biology
- Structural Biology
- Biochemistry
Background:
- DNA polymerases share a common right-hand structural topology with finger, palm, and thumb subdomains.
- Previous models and structural data for DNA polymerases, including the Klenow fragment (KF) and HIV-1 reverse transcriptase, suggested a conserved DNA-binding orientation.
- Conflicting structural data for polymerase beta (pol beta) bound to DNA raised questions about a universal DNA-binding mode.
Purpose of the Study:
- To resolve the conflicting data regarding the orientation of template-primer DNA in DNA polymerases.
- To establish a common DNA-binding mode applicable to all DNA polymerases, including polymerase beta.
Main Methods:
- Utilized an alternative superposition scheme to analyze crystal structures of various DNA polymerases.
- Compared DNA-binding orientations across different polymerase families, including pol beta.
Main Results:
- Provided convincing evidence for a common DNA-binding mode across diverse DNA polymerases.
- Demonstrated that polymerase beta adheres to this conserved DNA-binding orientation, resolving previous discrepancies.
Conclusions:
- A universal DNA-binding mode exists for DNA polymerases, unifying structural and functional understanding.
- The findings reconcile conflicting structural data and establish a consistent model for DNA polymerase-DNA interaction.