6fs4

NMR structure of Casocidin-II antimicrobial peptide in 60% TFENMR structure of Casocidin-II antimicrobial peptide in 60% TFE

Structural highlights 6fs4 is a 1 chain structure with sequence from Bos taurus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CASA2_BOVIN Important role in the capacity of milk to transport calcium phosphate. Casocidin-I inhibits the growth of E.coli and S.carnosus. Publication Abstract from PubMed Antimicrobial peptides (AMPs) represent crucial components of the natural immune defense machinery of different organisms. Generally, they are short and positively charged, and bind to and destabilize bacterial cytoplasmic membranes, ultimately leading to cell death. Natural proteolytic cleavage of alphas2-casein in bovine milk generates the antimicrobial peptides casocidin I and II. In the current study, we report for the first time on a detailed structure characterization of casocidins in solution by means of Nuclear Magnetic Resonance spectroscopy (NMR). Structural studies were conducted in H2O and different membrane mimetic environments, including 2,2,2-trifluoroethanol (TFE) and lipid anionic and zwitterionic vesicles. For both peptides, results indicate a mainly disordered conformation in H2O, with a few residues in a partial helical structure. No wide increase of order occurs upon interaction with lipid vesicles. Conversely, peptide conformation becomes highly ordered in presence of TFE, with both casocidins presenting a large helical content. Our data point out a preference of casocidins to interact with model anionic membranes. These results are compatible with possible mechanisms of action underlying the antimicrobial activity of casocidins that ultimately may affect membrane bilayer stability. The antimicrobial peptides casocidins I and II: solution structural studies in water and different membrane-mimetic environments.,Mercurio FA, Scaloni A, Caira S, Leone M Peptides. 2018 Sep 19. pii: S0196-9781(18)30173-6. doi:, 10.1016/j.peptides.2018.09.004. PMID:30243923 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

spinqualitylabelsall models 6fs4 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image