33 results found
    1. Neuroscience

    Nanodomain coupling explains Ca2+ independence of transmitter release time course at a fast central synapse

    Itaru Arai, Peter Jonas
    Ca2+ channels and release sensors at a fast central synapse are tightly coupled, which minimizes the effect of extracellular Ca2+ concentration on the timing of transmitter release.
    1. Cell Biology

    Super-resolution microscopy reveals majorly mono- and dimeric presenilin1/γ-secretase at the cell surface

    Abril Angélica Escamilla-Ayala et al.
    Super-resolution microscopy sets a new strategy to comprehend the membrane organization of γ-secretase at single complex resolution identifying nanodomain associations and its diffusion in situ in the living membrane.
    1. Cell Biology

    Stable Pom1 clusters form a glucose-modulated concentration gradient that regulates mitotic entry

    Corey A H Allard et al.
    Dynamic signaling protein clusters sample and map the cell surface to ensure that cells divide at the proper size.
    1. Neuroscience

    Doc2B acts as a calcium sensor for vesicle priming requiring synaptotagmin-1, Munc13-2 and SNAREs

    Sébastien Houy et al.
    Doc2B functions in two distinct vesicle priming steps; membrane localization occludes upstream Ca2+-dependent priming, whereas Ca2+-binding and interaction with synaptotagmin-1, SNAREs, and Munc13-2 are involved in downstream priming, which makes vesicles readily releasable.
    1. Structural Biology and Molecular Biophysics
    2. Neuroscience

    A novel region in the CaV2.1 α1 subunit C-terminus regulates fast synaptic vesicle fusion and vesicle docking at the mammalian presynaptic active zone

    Matthias Lübbert et al.
    A novel region in the CaV2.1 α1 subunit regulates coupling of synaptic vesicles to CaV2.1 calcium channels, synaptic vesicle release and docking, and the size of the fast and total releasable pools of synaptic vesicles.
    1. Physics of Living Systems

    Measuring ligand-cell surface receptor affinities with axial line-scanning fluorescence correlation spectroscopy

    Antonia Franziska Eckert et al.
    A robust fluorescence microscopy-based data acquisition and analysis framework affords the precise measurement of cell surface receptor affinities toward their cognate ligands and their densities in live cells/tissues.
    1. Cell Biology
    2. Structural Biology and Molecular Biophysics

    IP3 mediated global Ca2+ signals arise through two temporally and spatially distinct modes of Ca2+ release

    Jeffrey T Lock, Ian Parker
    Cell-wide Ca2+ signals that regulate numerous cellular functions comprise dual Ca2+ release modes through IP3 receptors, punctate transients mediated by clustered receptors and spatiotemporally diffuse release through functionally distinct receptors.
    1. Neuroscience

    Drosophila Synaptotagmin 7 negatively regulates synaptic vesicle release and replenishment in a dosage-dependent manner

    Zhuo Guan et al.
    Drosophila synaptotagmin 7 functions to restrict SV availability and release, but does not act as the Ca2+ sensor mediating the asynchronous release and facilitation remaining in synaptotagmin 1 mutants.
    1. Neuroscience

    Ca2+ sensor synaptotagmin-1 mediates exocytosis in mammalian photoreceptors

    Justin J Grassmeyer et al.
    The vesicular Ca2+ sensor synaptotagmin-1 regulates both fast phasic and slow tonic glutamate release at ribbon synapses of rod and cone photoreceptor cells.
    1. Neuroscience

    The presynaptic ribbon maintains vesicle populations at the hair cell afferent fiber synapse

    Lars Becker et al.
    The auditory hair cell synaptic ribbon maintains vesicle pools near release sites in order to support sustained and timed vesicle release.

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