1,613 results found
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    DNA binding polarity, dimerization, and ATPase ring remodeling in the CMG helicase of the eukaryotic replisome

    Alessandro Costa et al.
    The Mcm2-7 motor unwinds DNA using an approach distinct from that of superfamily III helicases, and accesses multiple ring configurations and assembly states during the initiation of DNA replication.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Molecular insights into RNA and DNA helicase evolution from the determinants of specificity for a DEAD-box RNA helicase

    Anna L Mallam et al.
    The core domains of an RNA helicase interact with a wide variety of NTPs and nucleic acids suggesting how related enzymes may have evolved to have diverse functions.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Viral hijacking of a replicative helicase loader and its implications for helicase loading control and phage replication

    Iris V Hood, James M Berger
    A phage-encoded protein inhibits a bacterial replicative helicase loading factor by exploiting an internal site that auto-regulates loader self-assembly and ATPase activity.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Mechanisms of opening and closing of the bacterial replicative helicase

    Jillian Chase et al.
    Analysis of the Escherichia coli DnaB helicase•bacteriophage λ helicase loader (λP) complex provides insights into helicase opening, delivery to the origin and ssDNA entry, and closing in preparation for translocation.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Cooperative base pair melting by helicase and polymerase positioned one nucleotide from each other

    Divya Nandakumar et al.
    A detailed model of the T7 replisome with the precise positions of the helicase and polymerase at the replication fork explains how catalysis by the two enzymes is coordinated.
    1. Structural Biology and Molecular Biophysics
    2. Chromosomes and Gene Expression

    Dna2 nuclease-helicase structure, mechanism and regulation by Rpa

    Chun Zhou et al.
    X-ray crystallography reveals that the Dna2 nuclease-helicase contains a long tunnel through which single-stranded DNA threads, and an allosteric mechanism for displacing the DNA-binding protein Rpa that restricts cleavage to the proper polarity.
    1. Structural Biology and Molecular Biophysics

    Ambiguities in helical reconstruction

    Edward H Egelman
    While electron microscopic helical reconstruction is a powerful technique in structural biology, mistakes can be made in determining the helical symmetry, leading to structures that are artifactual.
    1. Microbiology and Infectious Disease

    Determination of host proteins composing the microenvironment of coronavirus replicase complexes by proximity-labeling

    Philip V'kovski et al.
    The molecular microenvironment of coronaviral replicase complexes provides functional and spatial links between conserved cellular processes and viral RNA synthesis, and highlights potential targets for the development of novel antivirals.
    1. Physics of Living Systems

    Sequence-dependent base pair stepping dynamics in XPD helicase unwinding

    Zhi Qi et al.
    The ability of an enzyme called XPD helicase to unwind the double helix is influenced by the DNA sequence and the availability of energy.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Homology sensing via non-linear amplification of sequence-dependent pausing by RecQ helicase

    Yeonee Seol et al.
    The rate of DNA unwinding by RecQ helicases is dramatically modulated by the DNA duplex stability in a geometry-dependent manner, providing an intrinsic mechanism for suppressing illegitimate recombination.

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