94 results found
    1. Structural Biology and Molecular Biophysics

    Complete dissection of transcription elongation reveals slow translocation of RNA polymerase II in a linear ratchet mechanism

    Manchuta Dangkulwanich et al.
    Quantification of all the major on- and off-pathway kinetic parameters in the transcription elongation cycle reveals that RNA polymerase II translocates slowly in a linear, non-branched Brownian ratchet mechanism.
    1. Microbiology and Infectious Disease

    Escherichia coli swimming is robust against variations in flagellar number

    Patrick J Mears et al.
    The swimming behavior of E. coli is surprisingly robust against the natural variations in the number of flagella per cell.
    1. Cell Biology

    An unmet actin requirement explains the mitotic inhibition of clathrin-mediated endocytosis

    Satdip Kaur et al.
    Endocytosis is switched off in dividing cells because actin is not available to assist the clathrin machinery at a time when membrane tension is increased.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    The Kinesin-12 Kif15 is a processive track-switching tetramer

    Hauke Drechsler et al.
    The first in vitro analysis of full-length human Kif15 provides insight into how hKif15 and its inhibitory binding partner hTpx2 modulate mitotic spindle architecture.
    1. Structural Biology and Molecular Biophysics

    Periodic DNA patrolling underlies diverse functions of Pif1 on R-loops and G-rich DNA

    Ruobo Zhou et al.
    Analyzing single molecules reveals that Pif1 family helicases periodically patrol DNA, which may explain this enzyme's ability to suppress genome instability at G-quadruplex motifs and transcriptional RNA-DNA hybrids (R-loops).
    1. Physics of Living Systems
    2. Cell Biology

    Flagellar synchronization through direct hydrodynamic interactions

    Douglas R Brumley et al.
    A combination of experiment and theory shows that pairs of eukaryotic flagella can achieve robust synchronization solely through the action of the fluid that surrounds them.
    1. Biochemistry and Chemical Biology
    2. Physics of Living Systems

    Direct measurement of the mechanical work during translocation by the ribosome

    Tingting Liu et al.
    ‘Optical tweezers’ measurements of single ribosomes and single mRNA molecules show that the translation rate depends exponentially on the applied force, and suggests that the ribosome functions as a Brownian ratchet.
    1. Structural Biology and Molecular Biophysics
    2. Cell Biology

    Common intermediates and kinetics, but different energetics, in the assembly of SNARE proteins

    Sylvain Zorman et al.
    The energy landscape of SNARE folding and assembly is optimized for efficient stage-wise membrane fusion.
    1. Developmental Biology
    2. Neuroscience

    Cannabinoid-induced actomyosin contractility shapes neuronal morphology and growth

    Alexandre B Roland et al.
    Cannabinoids inhibit neuronal expansion and growth through the rapid contraction of actomyosin.
    1. Physics of Living Systems
    2. Developmental Biology

    Distinct mechanisms regulating mechanical force-induced Ca2+ signals at the plasma membrane and the ER in human MSCs

    Tae-Jin Kim et al.
    Deep penetration and transmission of mechanical force to regulate ER functions depends on not only the passive cytoskeletal support, but also the active actomyosin contractility, which is dispensable for mechanotransduction at the plasma membrane.

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