Sandbox 173: Difference between revisions
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There is the presence of a cationic amphipathic Helix 8, known as the fourth cytoplasmic loop, that spans from <scene name='Sandbox_173/Helix_8/1'>Asparagine 310 to Cysteine 323</scene> and is formed from the C-terminal tail anchoring to the membrane by | There is the presence of a cationic amphipathic Helix 8, known as the fourth cytoplasmic loop, that spans from <scene name='Sandbox_173/Helix_8/1'>Asparagine 310 to Cysteine 323</scene> and is formed from the C-terminal tail anchoring to the membrane by | ||
<scene name='Sandbox_173/Cys322_and_cys323/1'>Cysteine 322 and Cysteine 323</scene>, which | <scene name='Sandbox_173/Cys322_and_cys323/1'>Cysteine 322 and Cysteine 323</scene>, which are <scene name='Sandbox_173/Palmitates/2'>palmitoylated</scene>. This helix runs approximately parallel to the cytoplasmic surface and is involved in Gtγ binding<ref>Article 9</ref>, as well as the modulation of rhodopsin-transducin interactions and rhodopsin-phospholipid interactions<ref>Article 12</ref>. | ||
A metal zinc ion bridge chelated by histidine side-chains and connected to the cytoplasmic ends of Helix 3 and 6 is observed to prevent receptor activation. This perhaps indicates that separation of these cytoplasmic ends would contribute to rhodopsin activation<ref>Article 10</ref>. | A metal zinc ion bridge chelated by histidine side-chains and connected to the cytoplasmic ends of Helix 3 and 6 is observed to prevent receptor activation. This perhaps indicates that separation of these cytoplasmic ends would contribute to rhodopsin activation<ref>Article 10</ref>. | ||
The structure of rhodopsin may provide stability to the important Schiff base linkage with the retinal by affecting its hydrolysis, limiting its interactions with solvent, inhibiting its release when hydrolyzed, thus encouraging rebinding of the Schiff base linkage<ref>Article 3</ref>. | The structure of rhodopsin may provide stability to the important Schiff base linkage with the retinal by affecting its hydrolysis, limiting its interactions with solvent, and inhibiting its release when hydrolyzed, thus encouraging rebinding of the Schiff base linkage<ref>Article 3</ref>. | ||
<applet load='1u19' size='300' color='black' frame='true' align='right' caption='11-cis Retinylidene Chromophore. The generated structures are from Chain A.'/> | <applet load='1u19' size='300' color='black' frame='true' align='right' caption='11-cis Retinylidene Chromophore. The generated structures are from Chain A.'/> | ||
