National Institutes of Health/National Institute on Alcohol Abuse and Alcoholism (NIH/NIAAA)
AA018734
米国
引用
ジャーナル: Cell Rep / 年: 2021 タイトル: Structural insights into GIRK2 channel modulation by cholesterol and PIP. 著者: Yamuna Kalyani Mathiharan / Ian W Glaaser / Yulin Zhao / Michael J Robertson / Georgios Skiniotis / Paul A Slesinger / 要旨: G-protein-gated inwardly rectifying potassium (GIRK) channels are important for determining neuronal excitability. In addition to G proteins, GIRK channels are potentiated by membrane cholesterol, ...G-protein-gated inwardly rectifying potassium (GIRK) channels are important for determining neuronal excitability. In addition to G proteins, GIRK channels are potentiated by membrane cholesterol, which is elevated in the brains of people with neurodegenerative diseases such as Alzheimer's dementia and Parkinson's disease. The structural mechanism of cholesterol modulation of GIRK channels is not well understood. In this study, we present cryo- electron microscopy (cryoEM) structures of GIRK2 in the presence and absence of the cholesterol analog cholesteryl hemisuccinate (CHS) and phosphatidylinositol 4,5-bisphosphate (PIP). The structures reveal that CHS binds near PIP in lipid-facing hydrophobic pockets of the transmembrane domain. Our structural analysis suggests that CHS stabilizes PIP interaction with the channel and promotes engagement of the cytoplasmic domain onto the transmembrane region. Mutagenesis of one of the CHS binding pockets eliminates cholesterol-dependent potentiation of GIRK2. Elucidating the structural mechanisms underlying cholesterol modulation of GIRK2 channels could facilitate the development of therapeutics for treating neurological diseases. VIDEO ABSTRACT.
全体 : G protein-gated inwardly rectifying potassium channel (GIRK2)
全体
名称: G protein-gated inwardly rectifying potassium channel (GIRK2)
要素
複合体: G protein-gated inwardly rectifying potassium channel (GIRK2)
タンパク質・ペプチド: G protein-gated inwardly rectifying potassium channel (GIRK2)
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超分子 #1: G protein-gated inwardly rectifying potassium channel (GIRK2)
超分子
名称: G protein-gated inwardly rectifying potassium channel (GIRK2) タイプ: complex / ID: 1 / 親要素: 0 / 含まれる分子: all 詳細: The cryoEM structure obtained in the absence of modulators cholesteryl hemisuccinate and PIP2.
由来(天然)
生物種: Mus musculus (ハツカネズミ)
組換発現
生物種: Komagataella pastoris (菌類)
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分子 #1: G protein-gated inwardly rectifying potassium channel (GIRK2)