1prn

REFINED STRUCTURE OF PORIN FROM RHODOPSEUDOMONAS BLASTICA AND COMPARISON WITH THE PORIN FROM RHODOBACTER CAPSULATUS

spinqualitylabelsall models 1prn, resolution 1.96Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1prn is a 1 chain structure with sequence from Rhodobacter blasticus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: C8E Resources: FirstGlance, OCA, RCSB, PDBsum Function [PORI_RHOBL] Forms channels that allow the passive diffusion of small hydrophilic solutes up to an exclusion limit of about 0.6 kDa. Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The structure of the membrane channel porin from the phototrophic bacteria Rhodopseudomonas blastica has been refined at 1.96 A resolution yielding an R-factor of 17.6%. The final model consists of all 289 amino acid residues, 247 water molecules and three detergent molecules modelled as n-octyltetraoxyethylene. One of these detergent molecules binds together with its two symmetry-related molecules tightly in a pocket at the molecular 3-fold axis. This pocket may bind three alkyl chains of a lipopolysaccharide which in turn would stabilize the trimer and could possibly play a role in membrane insertion. The overall shape of this porin resembles OmpF of Escherichia coli more than the only known sequence-related porin from Rhodobacter capsulatus. The membrane contacting surface is similar in all structurally known porins; it shows exceptional frequencies of amino acid residues and side-chain rotamers. The 46-residue loop beta 5-beta 6 of the porin is shown to be tightly fastened to the beta-barrel, excluding an in vivo loop movement that closes the pore. The trimer interface region has the structure of a water-soluble protein with an extensive non-polar core and numerous hydrogen bonds at the surface. The loops at the external end of the barrel are long and rigid whereas those at the periplasmic barrel end are short and mobile. The crystal packing is discussed. Refined structure of the porin from Rhodopseudomonas blastica. Comparison with the porin from Rhodobacter capsulatus.,Kreusch A, Schulz GE J Mol Biol. 1994 Nov 11;243(5):891-905. PMID:7525973 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Porin

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