{"id":6253,"date":"2023-02-17T07:06:55","date_gmt":"2023-02-17T07:06:55","guid":{"rendered":"https:\/\/beta.nanion.de\/resource_library\/2018-molecular-mechanism-of-the-orai-channel-activation\/"},"modified":"2023-02-17T07:06:56","modified_gmt":"2023-02-17T07:06:56","slug":"2018-molecular-mechanism-of-the-orai-channel-activation","status":"publish","type":"resource_library","link":"https:\/\/nanion.com\/ja\/resource_library\/2018-molecular-mechanism-of-the-orai-channel-activation\/","title":{"rendered":"2018 &#8211; Molecular mechanism of the Orai channel activation"},"content":{"rendered":"<p>The Orai channel is characterized by voltage independence, low conductance and high Ca<sup>2+<\/sup>\u00a0selectivity and plays an important role in Ca<sup>2+<\/sup>\u00a0influx through the plasma membrane. How the channel is activated and promotes Ca<sup>2+<\/sup>\u00a0permeation are not well understood. Here, we report the crystal structure and cryo-electron microscopy reconstruction of a Drosophila melanogaster Orai mutant (P288L) channel that is constitutively active according to electrophysiology. The open state of the Orai channel showed a hexameric assembly in which six TM1 helices in the center form the ion-conducting pore, and six TM4 helices in the periphery form extended long helices. Orai channel activation requires conformational transduction from TM4 to TM1 and eventually causes the basic section of TM1 to twist outward. The wider pore on the cytosolic side aggregates anions to increase the potential gradient across the membrane and thus facilitate Ca<sup>2+<\/sup>\u00a0permeation. The open-state structure of the Orai channel offers insights into channel assembly, channel activation and Ca<sup>2+<\/sup>\u00a0permeation.<\/p>\n","protected":false},"featured_media":0,"template":"","products_tags":[45,129],"resource_type":[75],"application_areas":[50],"therapeutic_areas":[],"target_categories":[],"target_families":[],"targets":[],"resource_keyword":[],"class_list":["post-6253","resource_library","type-resource_library","status-publish","hentry","products_tags-port-a-patch","products_tags-vesicle-prep-pro","resource_type-publication","application_areas-ion-channels"],"acf":[],"_links":{"self":[{"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/resource_library\/6253","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/resource_library"}],"about":[{"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/types\/resource_library"}],"wp:attachment":[{"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/media?parent=6253"}],"wp:term":[{"taxonomy":"products_tags","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/products_tags?post=6253"},{"taxonomy":"resource_type","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/resource_type?post=6253"},{"taxonomy":"application_areas","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/application_areas?post=6253"},{"taxonomy":"therapeutic_areas","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/therapeutic_areas?post=6253"},{"taxonomy":"target_categories","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/target_categories?post=6253"},{"taxonomy":"target_families","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/target_families?post=6253"},{"taxonomy":"targets","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/targets?post=6253"},{"taxonomy":"resource_keyword","embeddable":true,"href":"https:\/\/nanion.com\/ja\/wp-json\/wp\/v2\/resource_keyword?post=6253"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}