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Ion channels are specialized proteins on the plasma membrane that allow charged ions to pass down their electrochemical gradient. Their main function is to maintain the membrane potential which is critical for cell viability. These channels are either gated or non-gated and can transport more than a thousand ions within milliseconds for the cellular event to occur.
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Isolation and Kv Channel Recordings in Murine Atrial and Ventricular Cardiomyocytes
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Mechanisms of KCNQ1 gating modulation by KCNE1/3 for cell-specific function.

Chenxi Cui, Lu Zhao, Ali A Kermani

    Biorxiv : the Preprint Server for Biology
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    KCNE1 and KCNE3 subunits distinctly regulate KCNQ1 potassium channels via two PIP2-binding sites, influencing voltage sensitivity and gating for tissue-specific ion homeostasis.

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    Area of Science:

    • Molecular Biology
    • Biophysics
    • Ion Channel Physiology

    Background:

    • KCNQ1 potassium channels are crucial for cardiac rhythm and intestinal function.
    • KCNE subunits (KCNE1-5) modulate KCNQ1 channel properties in different tissues.
    • KCNQ1 activation depends on voltage and phosphatidylinositol 4,5-bisphosphate (PIP2), influenced by GPCR signaling.

    Purpose of the Study:

    • To elucidate the structural basis and functional consequences of KCNE1/3 modulation on KCNQ1 gating.
    • To investigate how KCNE1/3 subunits affect KCNQ1's voltage and PIP2-dependent activation.
    • To understand the role of KCNE1/3 in KCNQ1 channel function within different cellular contexts.

    Main Methods:

    • X-ray crystallography to resolve KCNQ1-KCNE1 complex structures.
    • Reassessment of existing KCNQ1-KCNE3 structures with and without PIP2.
    • Functional analysis of PIP2-dependent gating and voltage sensitivity.

    Main Results:

    • KCNQ1-KCNE1/3 complexes possess two PIP2-binding sites, including a novel site involving voltage sensor-pore domain coupling residues.
    • KCNE1 and KCNE3 differentially modulate KCNQ1's PIP2-dependent gating and voltage sensitivity.
    • KCNE3 converts KCNQ1 into a voltage-insensitive, PIP2-gated channel regulated by GPCRs.
    • KCNE1 enhances KCNQ1's PIP2 affinity and GPCR resistance, forming voltage-gated channels for cardiac function.

    Conclusions:

    • KCNE1 and KCNE3 subunits impart distinct gating properties to KCNQ1 channels through unique interactions with PIP2-binding sites.
    • KCNE3 facilitates GPCR-mediated regulation of KCNQ1 in non-excitable cells for ion homeostasis.
    • KCNE1 promotes voltage-gated KCNQ1 function in cardiac cells, contributing to the slow-delayed rectifier current.
    • Understanding these KCNE1/3-KCNQ1 interactions offers insights for tissue-specific channel modulation.