29 results found
    1. Biochemistry and Chemical Biology

    Imaging and energetics of single SSB-ssDNA molecules reveal intramolecular condensation and insight into RecOR function

    Jason C Bell et al.
    Individual SSB-ssDNA complexes undergo reversible condensation and de-condensation that is modulated by RecOR during recombination.
    1. Chromosomes and Gene Expression
    2. Structural Biology and Molecular Biophysics

    ParB dynamics and the critical role of the CTD in DNA condensation unveiled by combined force-fluorescence measurements

    Julene Madariaga-Marcos et al.
    A single-molecule biophysical approach reveals that the C-terminal domain of ParB blocks ParB network formation by heterodimerization with the full-length protein, which remains bound to the DNA.
    1. Structural Biology and Molecular Biophysics
    2. Chromosomes and Gene Expression

    The mechanism of variability in transcription start site selection

    Libing Yu et al.
    Variability in bacterial transcription start site selection involves DNA “scrunching” and “anti-scrunching,” which may represent a general mechanism for start site selection in all organisms.
    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.
    1. Structural Biology and Molecular Biophysics
    2. Chromosomes and Gene Expression

    The structural basis for dynamic DNA binding and bridging interactions which condense the bacterial centromere

    Gemma LM Fisher et al.
    A combination of structural, biochemical, single-molecule and in vivo methods are used to show how ParB locally condenses the bacterial chromosome near the origin and earmarks this region for segregation.
    1. Physics of Living Systems
    2. Cell Biology

    The axonal actin-spectrin lattice acts as a tension buffering shock absorber

    Sushil Dubey et al.
    A linear array of spectrin tetramers imparts mechanical stability to axons by allowing spectrin domains to unfold reversibly when an axon is stretched, thereby acting as tension buffers.
    1. Chromosomes and Gene Expression
    2. Physics of Living Systems

    DNA sequence encodes the position of DNA supercoils

    Sung Hyun Kim et al.
    Single-molecule experiments reveal that plectonemic supercoils occupy specific positions on DNA and a physical model relates this to the intrinsic curvature, providing an insight into how supercoiling organizes the genome.
    1. Structural Biology and Molecular Biophysics

    Top-down machine learning approach for high-throughput single-molecule analysis

    David S White et al.
    A new analysis algorithm (DISC) enables accurate analysis of data from high-throughput single-molecule paradigms and reveals a non-cooperative binding mechanism of cyclic nucleotide-binding domains from HCN ion channels.
    1. Immunology and Inflammation

    The activation of IgM- or isotype-switched IgG- and IgE-BCR exhibits distinct mechanical force sensitivity and threshold

    Zhengpeng Wan et al.
    The B cell receptors of naïve B cells need higher levels of mechanical force to be fully activated than those of memory B cells.
    1. Developmental Biology

    Axon tension regulates fasciculation/defasciculation through the control of axon shaft zippering

    Daniel Šmít et al.
    Competition between adhesive and tensile forces regulates axon fasciculation, thus introducing a new role of mechanical tension in the development of neural networks.

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