ArticleNucleic acids research2020
Dynamic structural insights into the molecular mechanism of DNA unwinding by the bacteriophage T7 helicase.
Article in Nucleic acids research, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.
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Who cites it
10 citing papers in PubMed, 17 citations in OpenAlex.
- DNA translocation by the CMG helicase: the helical inchworm model.Biochemical Society transactions · 2026Review
- Structure, Function and Inhibition of Helicases Involved in Virus Infection.Biomolecules · 2026Review
- Leading and lagging strand abasic sites differentially affect vertebrate replisome progression but involve analogous bypass mechanisms.Nucleic acids research · 2025Article
- Single-molecule fluorescence reveals the DNA unwinding mechanism of mitochondrial helicase TWINKLE and its interplay with single-stranded DNA-binding proteins.Nucleic acids research · 2025Article
- Continuous-time random walk model for the diffusive motion of helicases.QRB discovery · 2025Article
- Four Parallel Pathways in T4 Ligase-Catalyzed Repair of Nicked DNA with Diverse Bending Angles.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2024Article
- Inhibition of Replication Fork Formation and Progression: Targeting the Replication Initiation and Primosomal Proteins.International journal of molecular sciences · 2023Review
- RQC helical hairpin in Bloom's syndrome helicase regulates DNA unwinding by dynamically intercepting nascent nucleotides.iScience · 2022Article
- Single-Molecule Insights Into the Dynamics of Replicative Helicases.Frontiers in molecular biosciences · 2021Review
- Unraveling Reversible DNA Cross-Links with a Biological Machine.Chemical research in toxicology · 2020Article
Corrections and comments
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Authors and funding
11 authors at 3 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The hexametric T7 helicase (gp4) adopts a spiral lock-washer form and encircles a coil-like DNA (tracking) strand with two nucleotides bound to each subunit. However, the chemo-mechanical coupling mechanism in unwinding has yet to be elucidated. Here, we utilized nanotensioner-enhanced Förster resonance energy transfer with one nucleotide precision to investigate gp4-induced unwinding of DNA that contains an abasic lesion. We observed that the DNA unwinding activity of gp4 is hindered but not completely blocked by abasic lesions. Gp4 moves back and forth repeatedly when it encounters an abasic lesion, whereas it steps back only occasionally when it unwinds normal DNA. We further observed that gp4 translocates on the tracking strand in step sizes of one to four nucleotides. We propose that a hypothetical intermediate conformation of the gp4-DNA complex during DNA unwinding can help explain how gp4 molecules pass lesions, providing insights into the unwinding dynamics of gp4.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.