Download MendeleyIn crystallo observation of three metal ion promoted DNA polymerase misincorporation.
Chang, C., Lee Luo, C., Gao, Y.(2022) Nat Commun 13: 2346-2346
- PubMed: 35487947
- DOI: https://doi.org/10.1038/s41467-022-30005-3
- PubMed Abstract:
Error-free replication of DNA is essential for life. Despite the proofreading capability of several polymerases, intrinsic polymerase fidelity is in general much higher than what base-pairing energies can provide. Although researchers have investigated this long-standing question with kinetics, structural determination, and computational simulations, the structural factors that dictate polymerase fidelity are not fully resolved. Time-resolved crystallography has elucidated correct nucleotide incorporation and established a three-metal-ion-dependent catalytic mechanism for polymerases. Using X-ray time-resolved crystallography, we visualize the complete DNA misincorporation process catalyzed by DNA polymerase η. The resulting molecular snapshots suggest primer 3´-OH alignment mediated by A-site metal ion binding is the key step in substrate discrimination. Moreover, we observe that C-site metal ion binding preceded the nucleotidyl transfer reaction and demonstrate that the C-site metal ion is strictly required for misincorporation. Our results highlight the essential but separate roles of the three metal ions in DNA synthesis.
- Department of Biosciences, Rice University, Houston, TX, 77005, USA.
Organizational Affiliation:
