- PDB-6rld: STRUCTURE OF THE MECHANOSENSITIVE CHANNEL MSCS EMBEDDED IN THE ME... -
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基本情報
登録情報
データベース: PDB / ID: 6rld
タイトル
STRUCTURE OF THE MECHANOSENSITIVE CHANNEL MSCS EMBEDDED IN THE MEMBRANE BILAYER
要素
Small-conductance mechanosensitive channel
キーワード
MEMBRANE PROTEIN / CHANNEL / MECHANOSENSITIVE
機能・相同性
機能・相同性情報
intracellular water homeostasis / mechanosensitive monoatomic ion channel activity / protein homooligomerization / monoatomic ion transmembrane transport / identical protein binding / membrane / plasma membrane 類似検索 - 分子機能
Helix Hairpins - #1260 / SH3 type barrels. - #60 / Conserved TM helix / Mechanosensitive ion channel, conserved TM helix / Mechanosensitive ion channel MscS, archaea/bacteria type / : / : / Mechanosensitive ion channel MscS, C-terminal / Mechanosensitive ion channel, transmembrane helices 2/3 / Mechanosensitive ion channel MscS, conserved site ...Helix Hairpins - #1260 / SH3 type barrels. - #60 / Conserved TM helix / Mechanosensitive ion channel, conserved TM helix / Mechanosensitive ion channel MscS, archaea/bacteria type / : / : / Mechanosensitive ion channel MscS, C-terminal / Mechanosensitive ion channel, transmembrane helices 2/3 / Mechanosensitive ion channel MscS, conserved site / Uncharacterized protein family UPF0003 signature. / Mechanosensitive ion channel MscS, C-terminal / Mechanosensitive ion channel MscS, transmembrane-2 / Mechanosensitive ion channel MscS / Mechanosensitive ion channel, beta-domain / Mechanosensitive ion channel MscS, beta-domain superfamily / Alpha-Beta Plaits - #100 / LSM domain superfamily / SH3 type barrels. / Helix Hairpins / Roll / Alpha-Beta Plaits / 2-Layer Sandwich / Orthogonal Bundle / Mainly Beta / Mainly Alpha / Alpha Beta 類似検索 - ドメイン・相同性
ジャーナル: J Mol Biol / 年: 2019 タイトル: Structure of the Mechanosensitive Channel MscS Embedded in the Membrane Bilayer. 著者: Tim Rasmussen / Vanessa J Flegler / Akiko Rasmussen / Bettina Böttcher / 要旨: Since life has emerged, gradients of osmolytes over the cell membrane cause pressure changes in the cell and require tight regulation to prevent cell rupture. The mechanosensitive channel of small ...Since life has emerged, gradients of osmolytes over the cell membrane cause pressure changes in the cell and require tight regulation to prevent cell rupture. The mechanosensitive channel of small conductance (MscS) releases solutes and water when a hypo-osmotic shock raises the pressure in the cell. It is a member of a large family of MscS-like channels found in bacteria, archaea, fungi and plants and model for mechanosensation. MscS senses the increase of tension in the membrane directly by the force from the lipids, but the molecular mechanism is still elusive. We determined the lipid interactions of MscS by resolving the structure of Escherichia coli MscS embedded in membrane discs to 2.9-Å resolution using cryo-electron microscopy. The membrane is attached only to parts of the sensor paddles of MscS, but phospholipid molecules move through grooves into remote pockets on the cytosolic side. On the periplasmic side, a lipid bound by R88 at the pore entrance is separated from the membrane by TM1 helices. The N-terminus interacts with the periplasmic membrane surface. We demonstrate that the unique membrane domain of MscS promotes deep penetration of lipid molecules and shows multimodal interaction with the membrane to fine-tune tension sensing.