Structures of mismatch replication errors observed in a DNA polymerase.Johnson, S.J., Beese, L.S.
(2004) Cell 116: 803-816
- PubMed: 15035983
- DOI: 10.1016/s0092-8674(04)00252-1
- Structures With Same Primary Citation
- PubMed Abstract:
- Processive DNA synthesis observed in a polymerase crystal suggests a mechanism for the prevention of frameshift mutations.
Johnson, S.J., Taylor, J.S., Beese, L.S.
(2003) Proc Natl Acad Sci U S A 100: 3895
- Visualizing DNA Replication in a Catalytically Active Bacillus DNA Polymerase Crystal
Kiefer, J.R., Mao, C., Braman, J.C., Beese, L.S.
(1998) Nature 391: 304
- Crystal Structure of a Thermostable Bacillus DNA Polymerase I Large Fragment at 2.1 A Resolution
Kiefer, J.R., Mao, C., Hansen, C.J., Basehore, S.L., Hogrefe, H.H., Braman, J.C., Beese, L.S.
(1997) Structure 5: 95
Accurate DNA replication is essential for genomic stability. One mechanism by which high-fidelity DNA polymerases maintain replication accuracy involves stalling of the polymerase in response to covalent incorporation of mismatched base pairs, thereb ...
Accurate DNA replication is essential for genomic stability. One mechanism by which high-fidelity DNA polymerases maintain replication accuracy involves stalling of the polymerase in response to covalent incorporation of mismatched base pairs, thereby favoring subsequent mismatch excision. Some polymerases retain a "short-term memory" of replication errors, responding to mismatches up to four base pairs in from the primer terminus. Here we a present a structural characterization of all 12 possible mismatches captured at the growing primer terminus in the active site of a polymerase. Our observations suggest four mechanisms that lead to mismatch-induced stalling of the polymerase. Furthermore, we have observed the effects of extending a mismatch up to six base pairs from the primer terminus and find that long-range distortions in the DNA transmit the presence of the mismatch back to the enzyme active site, suggesting the structural basis for the short-term memory of replication errors.
Department of Biochemistry, Duke University Medical Center, Durham, NC 27710, USA.