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Human Pannexin 1 channel: Insight in structure–function mechanism and its potential physiological roles

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Abstract

Pannexins, large non-gap junction super family exists in vertebrates, play multiple roles in different cellular functions through their ATP release. Panx1-mediated adenosine 5′-triphosphate (ATP) release plays a vital role in physiological and pathophysiological conditions and is known major extracellular molecule in purinergic signaling. To modulate their function in vivo, a proper regulation of channel is necessary. Post-translational modifications are considered to be some regulating mechanisms for PANX1, while PANX2, PANX3 have been uncharacterized to date. Through their significant evidences, PANXs exclude from gap junction and conduits ATP release and other cellular molecules from cells by various mechanisms. PANX1 is most extensive characterized and implicated in ATP signaling and inflammatory processes. Despite the constant advances, much significance of PANX1 in physiological processes remains elusive. Recently, various research groups along with our group have reported the Cryo-EM structure of Panx1 channel and uncovered the hidden functions in structure–function mechanism as well as to provide the clear understanding in physiological and pathophysiological roles. These research groups reported the novel heptameric structure with contains 4 transmembrane helices (TM), two extracellular loops and one intracellular loop with N and C terminus located at the intracellular side. In addition, the structure contains a large pore of which an inhibitor CBX act as a plug that blocking the passage of substrate. In this context, this review will present current mechanistic understanding in structure and function together with significant physiological roles particularly ATP release in health and disease. As such, this review emphasizes on recent functional properties associated with novel heptameric channel and demystifies channel-mediated ATP release function.

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Authors and Affiliations

  1. Life Science Institute, Zhejiang University, Hangzhou, 310058, Zhejiang, People’s Republic of China

    Eijaz Ahmed Bhat

  2. Department of Biochemistry, University of Kashmir, Hazratbal, Jammu and Kashmir, India

    Nasreena Sajjad

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  1. Eijaz Ahmed Bhat
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  2. Nasreena Sajjad
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EAB wrote the main manuscript and made figures; NS edited the manuscript and revised the final manuscript.

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Bhat, E.A., Sajjad, N. Human Pannexin 1 channel: Insight in structure–function mechanism and its potential physiological roles. Mol Cell Biochem 476, 1529–1540 (2021). https://doi.org/10.1007/s11010-020-04002-3

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