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    1. Cell Biology
    2. Immunology and Inflammation

    B cells extract antigens at Arp2/3-generated actin foci interspersed with linear filaments

    Sophie I Roper et al.
    Two modes of actin polymerization, branched and linear, cooperate in B cells to extract antigens from surfaces of presenting cells.
    1. Plant Biology

    Homeostasis of branched-chain amino acids is critical for the activity of TOR signaling in Arabidopsis

    Pengfei Cao et al.
    Despite BCAAs being de novo-synthesized in chloroplasts, TOR activation by BCAAs is conserved in plants and triggers a re-organization of actin and actin-associated endomembranes.
    1. Cell Biology

    Calcium-mediated actin reset (CaAR) mediates acute cell adaptations

    Pauline Wales et al.
    Calcium influx during acute cell stimulation triggers a global actin reset in mammalian cells, which is linked to plasma membrane repair and transcription and has implications for our understanding of cell migration, cancer, inflammation and cell stress response.
    1. Cell Biology
    2. Physics of Living Systems

    Principles of self-organization and load adaptation by the actin cytoskeleton during clathrin-mediated endocytosis

    Matthew Akamatsu et al.
    An experimentally constrained multiscale mathematical model predicts that branched actin networks self-organize at endocytic sites and bend to produce force, which was verified with cryo-electron tomography of intact cells.
    1. Cell Biology

    Epsin deficiency impairs endocytosis by stalling the actin-dependent invagination of endocytic clathrin-coated pits

    Mirko Messa et al.
    Epsin has a key role in the coupling of actin to endocytic clathrin coated pits that is required for their maturation and helps capture SNAREs at endocytic clathrin coated pits.
    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. Cell Biology
    2. Developmental Biology

    Cell-intrinsic and -extrinsic mechanisms promote cell-type-specific cytokinetic diversity

    Tim Davies et al.
    Functional molecular analysis of cytokinesis in Caenorhabditis elegans four-cell embryos reveals cell-type-specific variation in the fundamental dependence on a robust f-actin cytoskeleton for successful cell division, mediated by both cell-intrinsic and -extrinsic pathways.
    1. Structural Biology and Molecular Biophysics
    2. Cell Biology

    Symmetry breaking in reconstituted actin cortices

    Enas Abu Shah, Kinneret Keren
    A reconstituted system has been developed that self-organizes into dynamic actin cortices capable of spontaneous polarization, similar to the initial cortical polarization observed in cells during embryogenesis and development.
    1. Neuroscience

    Alpha protocadherins and Pyk2 kinase regulate cortical neuron migration and cytoskeletal dynamics via Rac1 GTPase and WAVE complex in mice

    Li Fan et al.
    A general cytoplasmic signaling mechanism for the novel functions of diverse alpha protocadherins in cortical neuron migration and actin cytoskeletal dynamics as well as dendrite morphogenesis in the brain.
    1. Cell Biology
    2. Developmental Biology

    A feedback mechanism converts individual cell features into a supracellular ECM structure in Drosophila trachea

    Arzu Öztürk-Çolak et al.
    Cell-cell junctions and the actin cytoskeleton are key players in the organisation and patterning of the extracellular matrix (ECM) on the apical side of tracheal cells.