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• W2073162736 abstract "Membrane proteins perform many essential cellular functions. Over the last years, substantial advances have been made in our understanding of the structure and function of isolated membrane proteins. However, like soluble proteins, many membrane proteins assemble into supramolecular complexes that perform specific functions in specialized membrane domains. Since supramolecular complexes of membrane proteins are difficult to study by conventional approaches, little is known about their composition, organization and assembly. The high signal-to-noise ratio of the images that can be obtained with an atomic force microscope (AFM) makes this instrument a powerful tool to image membrane protein complexes within native membranes. Recently, we have reported high-resolution topographs of junctional microdomains in native eye lens membranes containing two-dimensional (2D) arrays of aquaporin-0 (AQP0) surrounded by connexons. While both proteins are involved in cell adhesion, AQP0 is a specific water channel whereas connexons form cell-cell communication channels with broad substrate specificity. Here, we have performed a detailed analysis of the supramolecular organization of AQP0 tetramers and connexon hexamers in junctional microdomains in the native lens membrane. We present first structural models of these junctional microdomains, which we generated by docking atomic models of AQP0 and connexons into the AFM topographs. The AQP0 2D arrays in the native membrane show the same molecular packing of tetramers seen in highly ordered double-layered 2D crystals obtained through reconstitution of purified AQP0. In contrast, the connexons that surround the AQP0 arrays are only loosely packed. Based on our AFM observations, we propose a mechanism that may explain the supramolecular organization of AQP0 and connexons in junctional domains in native lens membranes." @default.
• W2073162736 created "2016-06-24" @default.
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• W2073162736 date "2007-12-01" @default.
• W2073162736 modified "2023-09-24" @default.
• W2073162736 title "Structural models of the supramolecular organization of AQP0 and connexons in junctional microdomains" @default.
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• W2073162736 doi "https://doi.org/10.1016/j.jsb.2007.07.009" @default.
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