lecture 05 – extracellular signal receptors iii
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Lecture 05 – Extracellular Signal Receptors III. BIOL 5190/6190 Cellular & Molecular Singal Transduction Prepared by Bob Locy Last modified -13F. Extracellular Signal Receptors II. Voltage - gated ion channels ( VOCs ) Ligand - gated ion channels. Ion channel receptors. Voltage gating. - PowerPoint PPT PresentationTRANSCRIPT
Lecture 05 – Extracellular Signal Receptors III
BIOL 5190/6190 Cellular & Molecular Singal TransductionPrepared by Bob Locy
Last modified -13F
Extracellular Signal Receptors II1. Voltage-gated ion channels (VOCs)2. Ligand-gated ion channels
Ion channel receptors
• Voltage gating
Ion channel receptors Voltage Operated Channel• Multisubunit – a1, a2, b, d, & g • Calcium channel – in PM• a1 – contains voltage sensor• a1 – also contains drug binding sites• Large cytosolic loop, links to synaptic vessicle
and/or ryanodine receptors• a2 – extracellular, regulatory, glycosylation• d – transmembrane region• b – intracellular and functions to mediate
intracellular effects in different cell types
Ion channel receptors Detailed structure• A1 has 4 repeat domains
(I-IV) each with 6 MSDs• MSD6 of each domain
makes the pore• b has 4 alpha helices, but
no MSDs• a2 and d (single MSD)
associate via disulfide • g has 4 MSDs• Regulation by protein
kinase A (AKAP18) phosphorylation.
Ion channel receptors
• 1.2 L-type channel (shown) differs in regulation from 1.1 L-type channel• PKC• Calumodulin (CAM)• G-protein
regulation of PP2A
Ion channel receptors
Ion channel receptors
Ion channel receptors
Ion channel receptors – ionontrophic glutamate receptors
Ion channel receptors
• Cyclic nucleotide- gated channels
Ion channel receptors
• Calcium signaling and intracellular calcium channels• IP3• Ryanodine
Ion channel receptors
• IP3 Receptor animation
Ion channel receptors
• Ryanodine
Ion channel receptors