ジャーナル: J Biol Chem / 年: 2011 タイトル: Molecular architecture and subunit organization of TRPA1 ion channel revealed by electron microscopy. 著者: Teresa L Cvetkov / Kevin W Huynh / Matthew R Cohen / Vera Y Moiseenkova-Bell / 要旨: Transient receptor potential ankyrin 1 (TRPA1) is a non-selective ion channel, which is expressed in nociceptor sensory neurons and transduces chemical, inflammatory, and neuropathic pain signals. ...Transient receptor potential ankyrin 1 (TRPA1) is a non-selective ion channel, which is expressed in nociceptor sensory neurons and transduces chemical, inflammatory, and neuropathic pain signals. Numerous non-reactive compounds and electrophilic compounds, such as endogenous inflammatory mediators and exogenous pungent chemicals, can activate TRPA1. Here we report a 16-Å resolution structure of purified, functional, amphipol-stabilized TRPA1 analyzed by single-particle EM. Molecular models of the N and C termini of the channel were generated using the I-TASSER protein structure prediction server and docked into the EM density to provide insight into the TRPA1 subunit organization. This structural analysis suggests a location for critical N-terminal cysteine residues involved in electrophilic activation at the interface between neighboring subunits. Our results indicate that covalent modifications within this pocket may alter interactions between subunits and promote conformational changes that lead to channel activation.
pH: 8 詳細: 20 mM HEPES, pH 8.0, 150 mM NaCl, 10% glycerol, 1.0 mM DTT
染色
タイプ: NEGATIVE 詳細: TRPA1 was adsorbed on carbon-film coated copper grids, washed with 3 droplets of pure water and subsequently stained with 1% uranyl acetate.
グリッド
詳細: 400 mesh copper grids with carbon
凍結
凍結剤: NONE / 装置: OTHER
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電子顕微鏡法
顕微鏡
FEI TECNAI F20
アライメント法
Legacy - 非点収差: objective lens astigmatism was corrected at 200,000 times magnification