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History of Gap Junction Architecture and Potential Role of Calmodulin in Channel Arrays
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History of Gap Junction Architecture and Potential Role of Calmodulin in Channel Arrays
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Journal Article
History of Gap Junction Architecture and Potential Role of Calmodulin in Channel Arrays
2025
Overview
This review article focuses first on the historical development of present understanding of gap junction channel architecture, one of its goals being to enlighten younger generations of scientists about the early steps of this field that begun over half a century ago. Early findings on gap junction architecture are reviewed as follows. The channels cross the membrane and project from the membrane surfaces; they are made of six subunits (hexamers) and show dimples on both ends, which represent inner and outer openings of the channel. Images of the central dimples on both channel ends (channel pores) seen in freeze-fracture replicas correspond to the electron-opaque spots visible in negatively stained sections and in isolated junctions. The channels are linked to each other extracellularly. Calmodulin (CaM) is a major accessory protein of gap junctions that is involved in channel gating and gap junction formation and is also likely to play a key role in determining different patterns of channel aggregation.
Publisher
MDPI AG
Subject
