64 results found
    1. Structural Biology and Molecular Biophysics

    Cryo-EM analysis of PIP2 regulation in mammalian GIRK channels

    Yiming Niu, Xiao Tao ... Roderick MacKinnon
    The structural role of PIP2 in opening the G-protein-gated K+ channel is revealed.
    1. Structural Biology and Molecular Biophysics

    Molecular basis of signaling specificity between GIRK channels and GPCRs

    Kouki K Touhara, Roderick MacKinnon
    A single kinetic step in the G protein activation cycle determines whether a G protein-coupled receptor activates G protein-gated K+ channels or not.
    1. Neuroscience

    RGS7/Gβ5/R7BP complex regulates synaptic plasticity and memory by modulating hippocampal GABABR-GIRK signaling

    Olga Ostrovskaya, Keqiang Xie ... Kirill A Martemyanov
    A critical regulator of inhibitory neurotransmitter signaling in the hippocampus has been identified in experiments on mice and been shown to play essential role in synaptic plasticity and memory.
    1. Neuroscience

    Gi/o protein-coupled receptors in dopamine neurons inhibit the sodium leak channel NALCN

    Fabian Philippart, Zayd M Khaliq
    The sodium leak NALCN channel functions as a core effector of GABA-B and D2 receptors that is used along with GIRK channels to regulate action potential firing in dopamine neurons.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Cooperative regulation by G proteins and Na+ of neuronal GIRK2 K+ channels

    Weiwei Wang, Kouki K Touhara ... Roderick MacKinnon
    Determining how GIRK2 activity depends on the concentration of Gβγ subunits in lipid membranes at different Na+ concentrations has allowed the Gβγ concentration generated during GABAB activation in neurons to be estimated.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    The GIRK1 subunit potentiates G protein activation of cardiac GIRK1/4 hetero-tetramers

    Kouki K Touhara, Weiwei Wang, Roderick MacKinnon
    The GIRK1 subunit contains a defective Na+-binding site but behaves as if it is permanently bound to a sodium ion, and therefore increases the affinity of Gβγ to GIRK1/4 hetero-tetrameric channels in lipid membranes.
    1. Biochemistry and Chemical Biology
    2. Structural Biology and Molecular Biophysics

    Quantitative analysis of mammalian GIRK2 channel regulation by G proteins, the signaling lipid PIP2 and Na+ in a reconstituted system

    Weiwei Wang, Matthew R Whorton, Roderick MacKinnon
    The G protein subunits Gβγ and the signaling lipid PIP2 are simultaneously needed to activate the potassium ion channel GIRK2 to control the voltage across a lipid bilayer, while sodium ions modulate these molecules' effects.
    1. Neuroscience

    Distinct regulation of dopamine D2S and D2L autoreceptor signaling by calcium

    Stephanie C Gantz, Brooks G Robinson ... Kim A Neve
    The loss of calcium-dependent D2 autoreceptor desensitization caused by prior in vivo cocaine exposure may be conferred by an unexpected role of the D2L splice variant as an autoreceptor.
    1. Structural Biology and Molecular Biophysics

    Ion Channels: Solving a specificity mystery

    Sanduo Zheng, Andrew C Kruse
    Differences in the kinetics of G protein activation can explain why only some receptors can activate potassium ion channels called GIRKs.
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