1,363 results found
    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. Chromosomes and Gene Expression

    Cdc6 ATPase activity disengages Cdc6 from the pre-replicative complex to promote DNA replication

    FuJung Chang et al.
    Biochemical and genetic characterization of the Cdc6 replication initiator reveals similarities in the helicase loading reaction between bacteria and eukaryotes.
    1. Structural Biology and Molecular Biophysics

    Routine single particle CryoEM sample and grid characterization by tomography

    Alex J Noble et al.
    Fiducial-less tomography on single particle cryoEM samples reveals that most particles are adsorbed to the air-water interface and allows for researchers to diagnose and solve sample, grid, ice thickness, collection, and processing issues.
    1. Cell Biology
    2. Chromosomes and Gene Expression

    DDK regulates replication initiation by controlling the multiplicity of Cdc45-GINS binding to Mcm2-7

    Lorraine De Jesús-Kim et al.
    A multi-step process of helicase activation sensitizes replication initiation to the extent of replicative helicase phosphorylation.
    1. Structural Biology and Molecular Biophysics

    High resolution cryo-EM structure of the helical RNA-bound Hantaan virus nucleocapsid reveals its assembly mechanisms

    Benoît Arragain et al.
    Hantaan virus nucleocapsid cryo-EM structure determined at 3.3 Å resolution reveals how nucleoproteins assemble into a metastable helix containing a continuous RNA-binding groove compatible with genome encapsidation and compaction.
    1. Structural Biology and Molecular Biophysics

    Gating mechanisms during actin filament elongation by formins

    Fikret Aydin et al.
    Formins slow elongation of actin filament by either sterically blocking the addition of actin subunits or flattening the helical twist of the filament end.
    1. Chromosomes and Gene Expression

    MCM2–7-dependent cohesin loading during S phase promotes sister-chromatid cohesion

    Ge Zheng et al.
    Systematic analyses of DNA replication machinery components in human cells reveal a requirement of MCM-dependent de novo loading or mobilization of cohesin at replication forks in establishing sister-chromatid cohesion.
    1. Cell Biology

    Transcription leads to pervasive replisome instability in bacteria

    Sarah M Mangiameli et al.
    Replication-transcription conflicts cause pervasive replisome instability.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Distinct and evolutionary conserved structural features of the human nuclear exosome complex

    Piotr Gerlach et al.
    Cryo-EM structure and biochemical characterization of the human nuclear exosome reveals its specific properties with respect to the yeast complex, underscoring the evolutionary conservation of the RNA-channeling mechanisms and hMTR4 helicase recruitment.

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