Porin: Difference between revisions

'''Voltage-Dependent Anion Channel (VDAC)''' is ion channel Omp found in outer mitochondrial membrane.  In Pseudomonas aeruginosa the porin gene products are named OprD, OprK, OprP. The images at the left and at the right correspond to one representative porin structure, ''i.e.'' crystal structure osmoporin OmpC from ''Escherichia coli'' ([[2j1n]]). OmpC has three beta-barrels associated to form a <scene name='Porin/Cv/2'>tight trimer</scene> <ref>PMID:16949612</ref>. Porin is a transmembrane protein, as can be seen from the <jmol><jmolLink><script>script "/scripts/1a0s/Hidrophobic/1.spt"; ppdiaCaptionCmd = "changeCaption('Hydrophobic residues (shown in pink) are prevalent where the protein comes in contact with the hydrophbic layer of the double membrane. Shown here is the sucrose-specific porin (PDB-ID 1a0s) in its trimeric quaternary structure.','white','black');";javascript @ppdiaCaptionCmd;</script><text>hydrophobic ring</text></jmolLink></jmol> around the protein, this makes it possible to submerge in the lipid bilayer (hydrophobic amino acids are sandybrown, hydrophilic ones are cyan). As you can <scene name='1a0s/Hidrophobic1/1'>see</scene> the hole in the protein is made of mainly hydrophilic chains thus making it possible for the sugar to pass through (these scenes were created by Nádori Gergely).