National Institutes of Health/National Cancer Institute (NIH/NCI)
1R01CA206573-01A1
米国
引用
ジャーナル: Nature / 年: 2018 タイトル: Opening of the human epithelial calcium channel TRPV6. 著者: Luke L McGoldrick / Appu K Singh / Kei Saotome / Maria V Yelshanskaya / Edward C Twomey / Robert A Grassucci / Alexander I Sobolevsky / 要旨: Calcium-selective transient receptor potential vanilloid subfamily member 6 (TRPV6) channels play a critical role in calcium uptake in epithelial tissues. Altered TRPV6 expression is associated with ...Calcium-selective transient receptor potential vanilloid subfamily member 6 (TRPV6) channels play a critical role in calcium uptake in epithelial tissues. Altered TRPV6 expression is associated with a variety of human diseases, including cancers. TRPV6 channels are constitutively active and their open probability depends on the lipidic composition of the membrane in which they reside; it increases substantially in the presence of phosphatidylinositol 4,5-bisphosphate. Crystal structures of detergent-solubilized rat TRPV6 in the closed state have previously been solved. Corroborating electrophysiological results, these structures demonstrated that the Ca selectivity of TRPV6 arises from a ring of aspartate side chains in the selectivity filter that binds Ca tightly. However, how TRPV6 channels open and close their pores for ion permeation has remained unclear. Here we present cryo-electron microscopy structures of human TRPV6 in the open and closed states. The channel selectivity filter adopts similar conformations in both states, consistent with its explicit role in ion permeation. The iris-like channel opening is accompanied by an α-to-π-helical transition in the pore-lining transmembrane helix S6 at an alanine hinge just below the selectivity filter. As a result of this transition, the S6 helices bend and rotate, exposing different residues to the ion channel pore in the open and closed states. This gating mechanism, which defines the constitutive activity of TRPV6, is, to our knowledge, unique among tetrameric ion channels and provides structural insights for understanding their diverse roles in physiology and disease.
履歴
登録
2017年11月18日
登録サイト: RCSB / 処理サイト: RCSB
改定 1.0
2017年12月20日
Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: EM metadata / Data content type: EM metadata / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Image / Data content type: Image / Provider: repository / タイプ: Initial release
改定 1.0
2017年12月20日
Data content type: Primary map / Data content type: Primary map / Provider: repository / タイプ: Initial release
Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / カテゴリ: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name
A: Transient receptor potential cation channel subfamily V member 6 B: Transient receptor potential cation channel subfamily V member 6 C: Transient receptor potential cation channel subfamily V member 6 D: Transient receptor potential cation channel subfamily V member 6