bidirectional double-stranded viral DNA replication / viral DNA genome replication / 加水分解酵素; エステル加水分解酵素; 5'-リン酸モノエステル産生エンドデオキシリボヌクレアーゼ / DNA polymerase processivity factor activity / viral transcription / 3'-5' exonuclease activity / DNA-templated DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA replication ...bidirectional double-stranded viral DNA replication / viral DNA genome replication / 加水分解酵素; エステル加水分解酵素; 5'-リン酸モノエステル産生エンドデオキシリボヌクレアーゼ / DNA polymerase processivity factor activity / viral transcription / 3'-5' exonuclease activity / DNA-templated DNA replication / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA replication / nucleotide binding / DNA binding / metal ion binding 類似検索 - 分子機能
Sliding clamp, C-terminal / Sliding clamp / gp45 sliding clamp, C terminal / DNA polymerase processivity factor / DNA polymerase processivity factor / DNA-directed DNA polymerase T4 type / : / DNA-directed DNA polymerase, family B, multifunctional domain / DNA-directed DNA polymerase, family B, conserved site / DNA polymerase family B signature. ...Sliding clamp, C-terminal / Sliding clamp / gp45 sliding clamp, C terminal / DNA polymerase processivity factor / DNA polymerase processivity factor / DNA-directed DNA polymerase T4 type / : / DNA-directed DNA polymerase, family B, multifunctional domain / DNA-directed DNA polymerase, family B, conserved site / DNA polymerase family B signature. / DNA polymerase family B / : / DNA polymerase family B, exonuclease domain / DNA-directed DNA polymerase, family B, exonuclease domain / DNA polymerase, palm domain superfamily / DNA polymerase type-B family / DNA-directed DNA polymerase, family B / Ribonuclease H superfamily / Ribonuclease H-like superfamily / DNA/RNA polymerase superfamily 類似検索 - ドメイン・相同性
DNA / DNA (> 10) / DNA-directed DNA polymerase / Sliding clamp 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM013306
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
GM131754
米国
引用
ジャーナル: Nucleic Acids Res / 年: 2025 タイトル: Structural insights into the exchange mechanism of a replicative DNA polymerase. 著者: Xiang Feng / Michelle M Spiering / Almeida Ruda de Luna Santos / Stephen J Benkovic / Huilin Li / 要旨: Replicative DNA polymerases are distinguished by their speed, processivity, and fidelity. While speed and fidelity arise from the polymerase's intrinsic catalytic and proofreading activities, ...Replicative DNA polymerases are distinguished by their speed, processivity, and fidelity. While speed and fidelity arise from the polymerase's intrinsic catalytic and proofreading activities, processivity is typically attributed to the DNA sliding clamp that tethers the polymerase to DNA. However, additional mechanisms may also contribute. The T4 bacteriophage polymerase can exchange on-the-fly, a process likely contributing to its ∼10-fold higher synthesis rate compared with human polymerases. Here, we reconstituted the T4 holoenzyme and polymerase exchange complexes using purified gp43 polymerase, gp45 sliding clamp, and a primer-template DNA substrate. Cryo-electron microscopy (cryo-EM) analysis revealed either one or two polymerases bound to the clamp and DNA. In the one-polymerase complex, the DNA threads perpendicularly through the clamp, supporting processive synthesis. In contrast, the two-polymerase complex displays a markedly tilted DNA orientation, impeding sliding and representing exchange intermediates. Three distinct conformational states of the two-polymerase complex define a multistep exchange mechanism. To our knowledge, these findings provide the first molecular-level view of replicative polymerase exchange.
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