Sandbox Reserved 1451: Difference between revisions

This is rhodopsin without 11-cis retinal bound.<scene name='77/778331/Rhodopsin/1'>Rhodopsin</scene> Fully functional rhodopsin has the typical GPCR structure of a seven transmembrane helical bundle with the N-terminus on the interior of the rods and the C-terminus in the cytoplasm. The N-terminus is located near the extracellular loops and ends of the transmembrane protein. There are hydrogen bonding between the transmembrane sections and the extracellular loops that are involved in the activation of rhodopsin when a photon is received. The N-terminus is thought to play a role in orientation of the extracellular loops. (NOTABILITY) Transmembrane domain 1 and 2 play a role in stabilizing the protein and giving the protein functionality. (ALTERATIONS) Rhodopsin has two components: opsin (a membrane-bound polypeptide) and 11-cis-retinal (a chromophore that is bound to opsin via a protonated Schiff-base). (RHODOPSIN AND RP)

This is 11-cis retinal that rhodopsin binds.<scene name='77/778331/11-cis retinal/1'>11-cis retinal</scene> 11-cis retinal is the ligand, a molecule that is derived from vitamin A, is necessary for rhodopsin function. The ligand performs an inverse agonist suppressing activity on the photon receptor and is associated with the protein via protonated Schiff-bases linked to a lysine reside on the seventh domain (NOTABILITY). A negative agonist means the ligand, when present in the binding pocket of the protein, inhibits the receptor activity. (RHODOPSIN AND RP) The isomerization of cis to trans causes the protein complex to relax which allows for binding of transducin and the signal cascade to progress (ALTERATIONS).  

This is rhodopsin with 11-cis retinal bound.<scene name='77/778331/Rhodopsin bound 11-cis retinal/1'>Rhodopsin bound 11-cis retinal</scene>