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Related Concept Videos

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Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...
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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...
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Related Experiment Video

Updated: Jan 10, 2026

Mutagenesis and Functional Analysis of Ion Channels Heterologously Expressed in Mammalian Cells
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Functionally-Coupled Ion Channels Begin Co-assembling at the Start of Their Synthesis.

Roya Pournejati, Jessica M Huang, Michael Ma

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    BK and Ca V1.3 channels form complexes before reaching the cell membrane. This pre-assembly in the endoplasmic reticulum and Golgi explains their functional coupling and proximity in cellular structures.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biophysics

    Background:

    • BK channels are modulated by calcium, suggesting functional links with calcium-permeable channels.
    • BK-Ca V1.3 hetero-clusters form at nanometer distances, indicating specific protein organization.

    Purpose of the Study:

    • To investigate the structural basis of BK and Ca V1.3 channel interaction.
    • To test the hypothesis that BK and Ca V1.3 channels assemble intracellularly before plasma membrane insertion.

    Main Methods:

    • Detecting intracellular protein interactions between BK and Ca V1.3.
    • Identifying intracellular compartments containing BK-Ca V1.3 hetero-clusters.
    • Measuring mRNA proximity for BK and Ca V1.3.
    • Assessing protein interactions during early translation.

    Main Results:

    • A subset of BK and Ca V1.3 transcripts are spatially close in micro-translational complexes.
    • Newly synthesized BK and Ca V1.3 proteins associate within the endoplasmic reticulum and Golgi.
    • Comparisons with control models support pre-insertion assembly.

    Conclusions:

    • BK and Ca V1.3 hetero-clusters form intracellularly prior to plasma membrane insertion.
    • This pre-assembly mechanism underlies the functional coupling and close proximity of these ion channels.