660 results found
    1. Structural Biology and Molecular Biophysics

    Auto-regulation of Rab5 GEF activity in Rabex5 by allosteric structural changes, catalytic core dynamics and ubiquitin binding

    Janelle Lauer et al.
    Understanding the complex auto-regulatory mechanisms for guanine nucleotide exchange factors is critically important for fully appreciating the layers of control for small GTPases.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Ric-8A, a G protein chaperone with nucleotide exchange activity induces long-range secondary structure changes in Gα

    Ravi Kant et al.
    Hydrogen-Deuterium exchange experiments show that Ric-8A induces similar dynamic changes in the structure of Gα as G protein-coupled receptors, yet protects a larger surface of the nucleotide-binding Ras domain.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Diversity and plasticity in Rab GTPase nucleotide release mechanism has consequences for Rab activation and inactivation

    Lars Langemeyer et al.
    Analysis of multiple guanine exchange factors shows that Rab activation can occur via a number of mechanistically distinct GDP-release pathways.
    1. Developmental Biology
    2. Neuroscience

    TIAM-1/GEF can shape somatosensory dendrites independently of its GEF activity by regulating F-actin localization

    Leo TH Tang et al.
    The DMA-1/LRR-TM cell surface receptor signals through partially redundant pathways to cell-autonomously pattern dendrites, including by directly forming a complex with both the TIAM-1/GEF and ACT-4/Actin.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    A G-protein activation cascade from Arl13B to Arl3 and implications for ciliary targeting of lipidated proteins

    Katja Gotthardt et al.
    The ciliary G-protein Arl13B – which is often mutated in Joubert syndrome – is the Guanine nucleotide exchange factor for the G-protein Arl3 and exclusively localizes to cilia.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    INAVA-ARNO complexes bridge mucosal barrier function with inflammatory signaling

    Phi Luong et al.
    Inflammatory bowel disease risk-gene, INAVA and the ARF-GEF ARNO, regulates non-canonical cortical actin assembly and IL-1b signaling to maintain epithelial homeostasis.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    ARL3 activation requires the co-GEF BART and effector-mediated turnover

    Yasmin ElMaghloob et al.
    BART is a co-GEF for ARL3 and maintains the active ARL3-GTP until it is recycled by ARL3 effectors.
    1. Biochemistry and Chemical Biology

    A non-linear system patterns Rab5 GTPase on the membrane

    Alice Cezanne et al.
    Both protein-protein and protein-lipid interactions are essential for Rab5 symmetry breaking at the early endosome.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Cryo-EM visualization of the ribosome in termination complex with apo-RF3 and RF1

    Jesper Pallesen et al.
    Cryo-electron microscopy has been used to provide a structural interpretation of the complete action cycle of release factor 3 during translation termination, which includes a coordinated sequence of interactions with a class-I release factor and the ribosome.
    1. Biochemistry and Chemical Biology
    2. Cell Biology

    Calcium depletion challenges endoplasmic reticulum proteostasis by destabilising BiP-substrate complexes

    Steffen Preissler et al.
    Regulation of the endoplasmic reticulum chaperone BiP by calcium.

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