160 results found
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Phosphatidylinositol 3-kinase and COPII generate LC3 lipidation vesicles from the ER-Golgi intermediate compartment

    Liang Ge et al.
    Building on previous work (Ge et al., 2013), it is shown that the ER-Golgi intermediate compartment is a platform for the production of COPII vesicles as precursor membranes for the lipidation of LC3, which is an essential step in autophagosome biogenesis.
    1. Cell Biology
    2. Neuroscience

    Phosphatidylinositol 4,5-bisphosphate optical uncaging potentiates exocytosis

    Alexander M Walter et al.
    Increasing PI(4,5)P2 on a sub-second timescale using a novel, membrane-permeant UV activatable PI(4,5)P2 molecule augments exocytosis which requires the PI(4,5)P2 interacting exocytotic proteins Munc13-2 and synaptotagmin-1.
    1. Structural Biology and Molecular Biophysics

    Architecture and dynamics of the autophagic phosphatidylinositol 3-kinase complex

    Sulochanadevi Baskaran et al.
    The first three-dimensional structure of the PI3KC3 complex I, which is involved in autophagy, provides a framework for understanding the allosteric regulation of lipid kinase activity.
    1. Cell Biology
    2. Developmental Biology

    The Sec14-like phosphatidylinositol transfer proteins Sec14l3/SEC14L2 act as GTPase proteins to mediate Wnt/Ca2+ signaling

    Bo Gong et al.
    Sec14l3/SEC14L2 respond to upstream Wnt/Frizzled/Dvl stimulation to recruit and activate phospholipase Cδ4a (Plcδ4a) to further initiate calcium release.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Structural basis for interdomain communication in SHIP2 providing high phosphatase activity

    Johanne Le Coq et al.
    The SHIP2 inositol phosphatase is an important upstream regulator of the Akt signaling pathway, which requires a catalytic core formed by the phosphatase domain tightly packed to a C2 domain for its function.
    1. Developmental Biology
    2. Neuroscience

    Vibrator and PI4KIIIα govern neuroblast polarity by anchoring non-muscle myosin II

    Chwee Tat Koe et al.
    Vibrator and PI4KIIIα that stimulate the synthesis of PI(4)P anchor non-muscle myosin II RLC (Sqh) to the plasma membrane and conversely Sqh associates with PI(4)P and facilitates its membrane localization during asymmetric division of neuroblasts.
    1. Cell Biology

    SAC1 degrades its lipid substrate PtdIns4P in the endoplasmic reticulum to maintain a steep chemical gradient with donor membranes

    James P Zewe et al.
    SAC1 is unable to adopt an efficient "trans" mode of action in living cells.
    1. Structural Biology and Molecular Biophysics

    Phosphoinositide-mediated oligomerization of a defensin induces cell lysis

    Ivan KH Poon et al.
    A novel innate defense mechanism of cell lysis involves the coordinated oligomerization of a defensin by interaction with the membrane lipid, phosphatidylinositol 4,5-bisphosphate.
    1. Plant Biology

    Glycosylphosphatidylinositol-anchored proteins as chaperones and co-receptors for FERONIA receptor kinase signaling in Arabidopsis

    Chao Li et al.
    FERONIA receptor kinase interacts with phosphatidylinositol-anchored proteins LORELEI and LLG1 to ensure its proper functional location in the cell membrane and engages them as co-receptors on the cell surface to mediate a broad spectrum of growth and signaling processes.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Sec17/Sec18 act twice, enhancing membrane fusion and then disassembling cis-SNARE complexes

    Hongki Song et al.
    Sec17 (αSNAP) and Sec18 (NSF) are shown to act twice, to promote fusion per se and to recycle SNAREs after fusion.

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