Replicative DNA Polymerases
Overview
Molecular Biology
Authors
Affiliations
In 1959, Arthur Kornberg was awarded the Nobel Prize for his work on the principles by which DNA is duplicated by DNA polymerases. Since then, it has been confirmed in all branches of life that replicative DNA polymerases require a single-stranded template to build a complementary strand, but they cannot start a new DNA strand de novo. Thus, they also depend on a primase, which generally assembles a short RNA primer to provide a 3'-OH that can be extended by the replicative DNA polymerase. The general principles that (1) a helicase unwinds the double-stranded DNA, (2) single-stranded DNA-binding proteins stabilize the single-stranded DNA, (3) a primase builds a short RNA primer, and (4) a clamp loader loads a clamp to (5) facilitate the loading and processivity of the replicative polymerase, are well conserved among all species. Replication of the genome is remarkably robust and is performed with high fidelity even in extreme environments. Work over the last decade or so has confirmed (6) that a common two-metal ion-promoted mechanism exists for the nucleotidyltransferase reaction that builds DNA strands, and (7) that the replicative DNA polymerases always act as a key component of larger multiprotein assemblies, termed replisomes. Furthermore (8), the integrity of replisomes is maintained by multiple protein-protein and protein-DNA interactions, many of which are inherently weak. This enables large conformational changes to occur without dissociation of replisome components, and also means that in general replisomes cannot be isolated intact.
Non-lytic spread of poliovirus requires the nonstructural protein 3CD.
Aponte-Diaz D, Harris J, Kang T, Korboukh V, Sotoudegan M, Gray J mBio. 2024; 16(1):e0327624.
PMID: 39665531 PMC: 11708018. DOI: 10.1128/mbio.03276-24.
The herpes simplex virus alkaline nuclease is required to maintain replication fork progression.
Mullon P, Maldonado-Luevano E, Mehta K, Mohni K J Virol. 2024; 98(12):e0183624.
PMID: 39508568 PMC: 11650972. DOI: 10.1128/jvi.01836-24.
Non-lytic spread of poliovirus requires the nonstructural protein 3CD.
Aponte-Diaz D, Harris J, Kang T, Korboukh V, Sotoudegan M, Gray J bioRxiv. 2024; .
PMID: 39464037 PMC: 11507938. DOI: 10.1101/2024.10.18.619132.
Click editing enables programmable genome writing using DNA polymerases and HUH endonucleases.
Ferreira da Silva J, Tou C, King E, Eller M, Rufino-Ramos D, Ma L Nat Biotechnol. 2024; .
PMID: 39039307 PMC: 11751136. DOI: 10.1038/s41587-024-02324-x.
Molecular basis for proofreading by the unique exonuclease domain of Family-D DNA polymerases.
Betancurt-Anzola L, Martinez-Carranza M, Delarue M, Zatopek K, Gardner A, Sauguet L Nat Commun. 2023; 14(1):8306.
PMID: 38097591 PMC: 10721889. DOI: 10.1038/s41467-023-44125-x.