cellular response to water deprivation / renal water transport / glycerol transmembrane transporter activity / Passive transport by Aquaporins / glycerol transmembrane transport / lumenal side of membrane / water transmembrane transporter activity / cellular response to mercury ion / water transport / water channel activity ...cellular response to water deprivation / renal water transport / glycerol transmembrane transporter activity / Passive transport by Aquaporins / glycerol transmembrane transport / lumenal side of membrane / water transmembrane transporter activity / cellular response to mercury ion / water transport / water channel activity / metanephric collecting duct development / renal water homeostasis / transport vesicle membrane / cellular response to copper ion / actin filament organization / recycling endosome / Vasopressin regulates renal water homeostasis via Aquaporins / basolateral plasma membrane / protein homotetramerization / apical plasma membrane / perinuclear region of cytoplasm / Golgi apparatus / extracellular exosome / membrane / plasma membrane Similarity search - Function
Aquaporin transporter / Major intrinsic protein, conserved site / MIP family signature. / Major intrinsic protein / Major intrinsic protein / Aquaporin-like Similarity search - Domain/homology
Journal: J Struct Biol / Year: 2023 Title: Structural analysis of the water channel AQP2 by single-particle cryo-EM. Authors: Akiko Kamegawa / Shota Suzuki / Hiroshi Suzuki / Kouki Nishikawa / Nobutaka Numoto / Yoshinori Fujiyoshi / Abstract: Water channels, which are small membrane proteins almost entirely buried in lipid membranes, are challenging research targets for single-particle cryo-electron microscopy (cryo-EM), a powerful ...Water channels, which are small membrane proteins almost entirely buried in lipid membranes, are challenging research targets for single-particle cryo-electron microscopy (cryo-EM), a powerful technique routinely used to determine the structures of membrane proteins. Because the single-particle method enables structural analysis of a whole protein with flexible parts that interfere with crystallization, we have focused our efforts on analyzing water channel structures. Here, utilizing this system, we analyzed the structure of full-length aquaporin-2 (AQP2), a primary regulator of vasopressin-dependent reabsorption of water at the renal collecting ducts. The 2.9 Å resolution map revealed a cytoplasmic extension of the cryo-EM density that was presumed to be the highly flexible C-terminus at which the localization of AQP2 is regulated in the renal collecting duct cells. We also observed a continuous density along the common water pathway inside the channel pore and lipid-like molecules at the membrane interface. Observations of these constructions in the AQP2 structure analyzed without any fiducial markers (e.g., a rigidly bound antibody) indicate that single-particle cryo-EM will be useful for investigating water channels in native states as well as in complexes with chemical compounds.
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