2细胞膜的跨膜信号转导功能 激素 细胞外 intracellular 机械信号 生理反应 物理信号 细胞膜
机械信号 细 胞 外 激 素 物理信号 intracellular 生理反应 细胞膜 ? 2 细胞膜的跨膜信号转导功能
Signal Extracellular molecule lon fluid binds to channel Membrane receptor initiates Signal transduction by proteins lon channel Amplifier enzymes alter Second messenger molecules Intracellular Increase fluid Protein kinases intracellular Ca2+ Phosphorylated Calcium-binding proteins proteins Cell response
G protein-linked receptor G蛋白偶联受体介导的信号转导 (A)ION-CHANNEL-LINKED RECEPTOR - 2ion channel-linked receptor IB)G-PROTEIN-LINKED RECEPTOR 离子通道偶联受体介导的信号转导 Gprotein activated activated enzyme or Gprotein enzyme or ion channel ion channel enzyme-linked receptor 酶偶联受体介导的信号转导 (C)ENZYME-LINKED RECEPTOR inactive active catalytic catalytic domain domain
① G protein-linked receptor G蛋白偶联受体介导的信号转导 ③ enzyme-linked receptor 酶偶联受体介导的信号转导 ②ion channel-linked receptor 离子通道偶联受体介导的信号转导
受体 Receptor(受体):A protein molecule in the cell membrane or within cells that selectively binds to a specific chemical and produces a specific physiologic effect 细胞中存在能专一 acetylcholine binding site lipid channel 性结合激素、神经 bilayer 递质以及其它化学 介质,并能触发特 4nm 定效应的蛋白质, CYTOSOL 称为受体。 gate
Receptor(受体):A protein molecule in the cell membrane or within cells that selectively binds to a specific chemical and produces a specific physiologic effect 受 体 细胞中存在能专一 性结合激素、神经 递质以及其它化学 介质,并能触发特 定效应的蛋白质, 称为受体
G蛋白 失活状态: a+B+Y+GDP Outside cell Receptor 激活状态: a亚基分离 Trimeric G protein GTP联 Cytosol
G 蛋白 失活状态: α+ß+γ+GDP 激活状态: α 亚基分离