: / DNA primase AEP / ribonucleotide binding / DNA replication initiation / Telomere C-strand synthesis initiation / DNA/RNA hybrid binding / Inhibition of replication initiation of damaged DNA by RB1/E2F1 / regulation of type I interferon production / alpha DNA polymerase:primase complex / Polymerase switching ...: / DNA primase AEP / ribonucleotide binding / DNA replication initiation / Telomere C-strand synthesis initiation / DNA/RNA hybrid binding / Inhibition of replication initiation of damaged DNA by RB1/E2F1 / regulation of type I interferon production / alpha DNA polymerase:primase complex / Polymerase switching / : / Processive synthesis on the lagging strand / DNA replication, synthesis of primer / lagging strand elongation / Removal of the Flap Intermediate / Polymerase switching on the C-strand of the telomere / mitotic DNA replication initiation / DNA synthesis involved in DNA repair / DNA strand elongation involved in DNA replication / leading strand elongation / G1/S-Specific Transcription / DNA replication origin binding / Activation of the pre-replicative complex / DNA replication initiation / Defective pyroptosis / double-strand break repair via nonhomologous end joining / nuclear matrix / protein import into nucleus / nuclear envelope / single-stranded DNA binding / 4 iron, 4 sulfur cluster binding / DNA-directed DNA polymerase / DNA-directed DNA polymerase activity / DNA replication / ciliary basal body / DNA repair / nucleotide binding / intracellular membrane-bounded organelle / chromatin binding / protein kinase binding / chromatin / nucleolus / magnesium ion binding / DNA binding / zinc ion binding / nucleoplasm / metal ion binding / nucleus / membrane / cytosol 類似検索 - 分子機能
DNA polymerase alpha, subunit B, N-terminal domain superfamily / : / DNA polymerase alpha subunit B, OB domain / DNA polymerase alpha subunit B N-terminal / DNA polymerase alpha, subunit B, N-terminal / DNA polymerase alpha, subunit B / DNA primase, small subunit, eukaryotic/archaeal / DNA primase, large subunit, eukaryotic / DNA primase, small subunit / DNA primase small subunit ...DNA polymerase alpha, subunit B, N-terminal domain superfamily / : / DNA polymerase alpha subunit B, OB domain / DNA polymerase alpha subunit B N-terminal / DNA polymerase alpha, subunit B, N-terminal / DNA polymerase alpha, subunit B / DNA primase, small subunit, eukaryotic/archaeal / DNA primase, large subunit, eukaryotic / DNA primase, small subunit / DNA primase small subunit / DNA primase large subunit, eukaryotic/archaeal / DNA polymerase alpha catalytic subunit, N-terminal domain / DNA polymerase alpha, zinc finger domain superfamily / Eukaryotic and archaeal DNA primase, large subunit / DNA Polymerase alpha zinc finger / DNA polymerase alpha subunit p180 N terminal / Zinc finger, DNA-directed DNA polymerase, family B, alpha / DNA polymerase alpha catalytic subunit, catalytic domain / DNA polymerase alpha/delta/epsilon, subunit B / DNA polymerase alpha/epsilon subunit B / DNA polymerase family B, thumb domain / DNA polymerase family B signature. / DNA-directed DNA polymerase, family B, multifunctional domain / DNA-directed DNA polymerase, family B, conserved site / 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 polymerase alpha catalytic subunit / DNA primase small subunit / DNA primase large subunit / DNA polymerase alpha subunit B 類似検索 - 構成要素
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
2T32GM008320-31
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM118089
米国
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)
R35GM136401
米国
引用
ジャーナル: J Mol Biol / 年: 2023 タイトル: Flexibility and Distributive Synthesis Regulate RNA Priming and Handoff in Human DNA Polymerase α-Primase. 著者: John J Cordoba / Elwood A Mullins / Lauren E Salay / Brandt F Eichman / Walter J Chazin / 要旨: DNA replication in eukaryotes relies on the synthesis of a ∼30-nucleotide RNA/DNA primer strand through the dual action of the heterotetrameric polymerase α-primase (pol-prim) enzyme. Synthesis of ...DNA replication in eukaryotes relies on the synthesis of a ∼30-nucleotide RNA/DNA primer strand through the dual action of the heterotetrameric polymerase α-primase (pol-prim) enzyme. Synthesis of the 7-10-nucleotide RNA primer is regulated by the C-terminal domain of the primase regulatory subunit (PRIM2C) and is followed by intramolecular handoff of the primer to pol α for extension by ∼20 nucleotides of DNA. Here, we provide evidence that RNA primer synthesis is governed by a combination of the high affinity and flexible linkage of the PRIM2C domain and the surprisingly low affinity of the primase catalytic domain (PRIM1) for substrate. Using a combination of small angle X-ray scattering and electron microscopy, we found significant variability in the organization of PRIM2C and PRIM1 in the absence and presence of substrate, and that the population of structures with both PRIM2C and PRIM1 in a configuration aligned for synthesis is low. Crosslinking was used to visualize the orientation of PRIM2C and PRIM1 when engaged by substrate as observed by electron microscopy. Microscale thermophoresis was used to measure substrate affinities for a series of pol-prim constructs, which showed that the PRIM1 catalytic domain does not bind the template or emergent RNA-primed templates with appreciable affinity. Together, these findings support a model of RNA primer synthesis in which generation of the nascent RNA strand and handoff of the RNA-primed template from primase to polymerase α is mediated by the high degree of inter-domain flexibility of pol-prim, the ready dissociation of PRIM1 from its substrate, and the much higher affinity of the POLA1cat domain of polymerase α for full-length RNA-primed templates.
タイプ: NEGATIVE / 材質: Uranyl Formate 詳細: 2.5 uL sample was applied to grid for 1 minute, then blotted with filter paper, washed for 5 seconds with DI water, blotted, washed for 5 seconds in stain, blotted, then stained for 90 seconds.