6r95

The solution NMR structure of cis-dicarba-brevinin-1BYa in 33% trifluoroethanol

spinqualitylabelsall models 6r95 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6r95 is a 1 chain structure with sequence from Rana boylii. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Ligands: ABA Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function BR1A_RANBO Publication Abstract from PubMed Brevinin-1BYa is a 24-amino acid residue host-defense peptide, first isolated from skin secretions of the foothill yellow-legged frog Rana boylii. The peptide is of interest, as it shows broad-spectrum antimicrobial activity, and is particularly effective against opportunistic yeast pathogens. Its potential for clinical use, however, is hindered by its latent haemolytic activity. The structures of two analogues, the less haemolytic [C18S,C24S]brevinin-1BYa and the more potent cis-dicarba-brevinin-1BYa, were investigated in various solution and membrane-mimicking environments by [Formula: see text] spectroscopy and molecular modelling techniques. Neither peptide possesses a secondary structure in aqueous solution. In both the membrane-mimicking sodium dodecyl sulphate micelles and 33% 2,2,2-trifluoroethanol ([Formula: see text] solvent mixture, the peptides' structures are characterised by two [Formula: see text]-helices connected by a flexible hinge located at the [Formula: see text] residues. With the aid of molecular dynamics simulations and paramagnetic probes, it was determined that the peptides' helical segments lie parallel to the micellar surface, with their hydrophobic residues facing towards the micelle core and the hydrophilic residues pointing outwards, suggesting that both peptides exert their biological activity by a non-pore-forming mechanism. Unlike that of the dicarba analogue, the C-terminus of the acyclic peptide is only weakly associated with the micellar surface and is in direct contact with the surrounding aqueous solvent. Insights into conformation and membrane interactions of the acyclic and dicarba-bridged brevinin-1BYa antimicrobial peptides.,Timmons PB, O'Flynn D, Conlon JM, Hewage CM Eur Biophys J. 2019 Dec;48(8):701-710. doi: 10.1007/s00249-019-01395-y. Epub 2019, Sep 12. PMID:31515575 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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