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

    Structural basis for activation and non-canonical catalysis of the Rap GTPase activating protein domain of plexin

    Yuxiao Wang et al.
    The crystal structures of the intracellular part of the plexin receptor in the active dimer form, and its complex with a key downstream signalling protein Rap, provide insights into how plexin initiates a signalling cascade involved in axon guidance.
    1. Structural Biology and Molecular Biophysics

    Structure analyses reveal a regulated oligomerization mechanism of the PlexinD1/GIPC/myosin VI complex

    Guijun Shang et al.
    PlexinD1 binding releases GIPC autoinhibition, leading to formation of high-order oligomers of the GIPC/myosin VI complex.
    1. Neuroscience

    Rap2 and TNIK control Plexin-dependent tiled synaptic innervation in C. elegans

    Xi Chen et al.
    Plexin controls the spatial distribution of synapses by locally inhibiting Rap2 small GTPase activity along the axon, and a Rap2 effector, TNIK, which also plays a key role in inhibiting synapse number.
    1. Developmental Biology
    2. Neuroscience

    Functional divergence of Plexin B structural motifs in distinct steps of Drosophila olfactory circuit assembly

    Ricardo Guajardo et al.
    Systematic in vivo analysis reveals the divergent engagement of Plexin B structural motifs in distinct neurodevelopmental processes and a regulatory role of convertase cleavage in Plexin B signaling.
    1. Developmental Biology

    GIPC proteins negatively modulate Plexind1 signaling during vascular development

    Jorge Carretero-Ortega et al.
    Zebrafish mutants and human endothelial cell experiments reveal that GIPC family endocytic adaptors bind to the Semaphorin receptor PLEXIND1, a critical regulator of vascular development, to negatively modulate its signaling.
    1. Neuroscience

    Stepwise wiring of the Drosophila olfactory map requires specific Plexin B levels

    Jiefu Li et al.
    PlexB plays a multifaceted role in instructing the assembly of the Drosophila olfactory circuit through temporally-regulated expression patterns and expression level-dependent effects.
    1. Developmental Biology

    SlitC-PlexinA1 mediates iterative inhibition for orderly passage of spinal commissural axons through the floor plate

    Hugo Ducuing et al.
    A combination of in vivo models and imaging techniques reveals the distribution of guidance cues and their mechanisms of action during commissural axon navigation of intermediate target.
    1. Neuroscience

    Semaphorin 5A inhibits synaptogenesis in early postnatal- and adult-born hippocampal dentate granule cells

    Yuntao Duan et al.
    Mice that lack the autism susceptibility gene Semaphorin 5A show excess excitatory synapse formation in dentate granule neurons and also altered social behavior, adding to evidence that a surplus of synapses contributes to the behavioral changes observed in autism spectrum disorders.
    1. Computational and Systems Biology
    2. Developmental Biology

    Temporal modulation of collective cell behavior controls vascular network topology

    Esther Kur et al.
    Tissue-specific temporal regulators impinge on the VEGF/Delta-Notch pathway to vary tip cell selection pace yielding diverse densities of vascular network.
    1. Developmental Biology
    2. Neuroscience

    Venous endothelin modulates responsiveness of cardiac sympathetic axons to arterial semaphorin

    Denise M Poltavski et al.
    Second-order guidance, a novel mechanism by which an initial guidance cue controls expression of a second guidance receptor, is required for precise refinement of axon trajectories during PNS development.

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