- PDB-6jgz: Structure of RyR2 (F/P/Ca2+ dataset) -
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基本情報
登録情報
データベース: PDB / ID: 6jgz
タイトル
Structure of RyR2 (F/P/Ca2+ dataset)
要素
Peptidyl-prolyl cis-trans isomerase FKBP1B
RyR2
キーワード
MEMBRANE PROTEIN / cryo-EM
機能・相同性
機能・相同性情報
positive regulation of sequestering of calcium ion / negative regulation of calcium-mediated signaling / negative regulation of insulin secretion involved in cellular response to glucose stimulus / neuronal action potential propagation / negative regulation of release of sequestered calcium ion into cytosol / insulin secretion involved in cellular response to glucose stimulus / response to redox state / 'de novo' protein folding / negative regulation of heart rate / FK506 binding ...positive regulation of sequestering of calcium ion / negative regulation of calcium-mediated signaling / negative regulation of insulin secretion involved in cellular response to glucose stimulus / neuronal action potential propagation / negative regulation of release of sequestered calcium ion into cytosol / insulin secretion involved in cellular response to glucose stimulus / response to redox state / 'de novo' protein folding / negative regulation of heart rate / FK506 binding / smooth muscle contraction / regulation of cardiac muscle contraction by regulation of the release of sequestered calcium ion / T cell proliferation / calcium channel inhibitor activity / Ion homeostasis / regulation of release of sequestered calcium ion into cytosol by sarcoplasmic reticulum / release of sequestered calcium ion into cytosol / calcium channel complex / sarcoplasmic reticulum membrane / calcium channel regulator activity / protein maturation / peptidyl-prolyl cis-trans isomerase activity / peptidylprolyl isomerase / calcium-mediated signaling / Stimuli-sensing channels / Z disc / positive regulation of cytosolic calcium ion concentration / protein refolding / transmembrane transporter binding / signaling receptor binding / membrane / cytoplasm 類似検索 - 分子機能
ジャーナル: Proc Natl Acad Sci U S A / 年: 2019 タイトル: Molecular basis for allosteric regulation of the type 2 ryanodine receptor channel gating by key modulators. 著者: Ximin Chi / Deshun Gong / Kang Ren / Gewei Zhou / Gaoxingyu Huang / Jianlin Lei / Qiang Zhou / Nieng Yan / 要旨: The type 2 ryanodine receptor (RyR2) is responsible for releasing Ca from the sarcoplasmic reticulum of cardiomyocytes, subsequently leading to muscle contraction. Here, we report 4 cryo-electron ...The type 2 ryanodine receptor (RyR2) is responsible for releasing Ca from the sarcoplasmic reticulum of cardiomyocytes, subsequently leading to muscle contraction. Here, we report 4 cryo-electron microscopy (cryo-EM) structures of porcine RyR2 bound to distinct modulators that, together with our published structures, provide mechanistic insight into RyR2 regulation. Ca alone induces a contraction of the central domain that facilitates the dilation of the S6 bundle but is insufficient to open the pore. The small-molecule agonist PCB95 helps Ca to overcome the barrier for opening. FKBP12.6 induces a relaxation of the central domain that decouples it from the S6 bundle, stabilizing RyR2 in a closed state even in the presence of Ca and PCB95. Although the channel is open when PCB95 is replaced by caffeine and adenosine 5'-triphosphate (ATP), neither of the modulators alone can sufficiently counter the antagonistic effect to open the channel. Our study marks an important step toward mechanistic understanding of the sophisticated regulation of this key channel whose aberrant activity engenders life-threatening cardiac disorders.