1p00

NMR structure of ETD151, mutant of the antifungal defensin ARD1 from Archaeoprepona demophon

spinqualitylabelsall models 1p00 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1p00 is a 1 chain structure with sequence from Archaeoprepona demophon. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 10 models Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DEFN_ARCDE Publication Abstract from PubMed Antimicrobial peptides are key components of the innate immune response in most multicellular organisms. These molecules are considered as one of the most innovative class of anti-infective agents that have been discovered over the last two decades, and therefore, as a source of inspiration for novel drug design. Insect cystine-rich antimicrobial peptides with the CS alpha beta scaffold (an alpha-helix linked to a beta-sheet by two disulfide bridges) represent particularly attractive templates for the development of systemic agents owing to their remarkable resistance to protease degradation. We have selected heliomicin, a broad spectrum antifungal CS alpha beta peptide from Lepidoptera as the starting point of a lead optimization program based on phylogenic exploration and fine tuned mutagenesis. We report here the characterization, biological activity, and 3D structure of heliomicin improved analogs, namely the peptides ARD1, ETD-135, and ETD-151. The ARD1 peptide was initially purified from the immune hemolymph of the caterpillars of Archeoprepona demophoon. Although it differs from heliomicin by only two residues, it was found to be more active against the human pathogens Aspergillus fumigatus and Candida albicans. The peptides ETD-135 and ETD-151 were engineered by site-directed mutagenesis of ARD1 in either cationic or hydrophobic regions. ETD-135 and ETD-151 demonstrated an improved antifungal activity over the native peptides, heliomicin and ARD1. A comparative analysis of the 3D structure of the four molecules highlighted the direct impact of the modification of the amphipathic properties on the molecule potency. In addition, it allowed to characterize an optimal organization of cationic and hydrophobic regions to achieve best antifungal activity. Lead optimization of antifungal peptides with 3D NMR structures analysis.,Landon C, Barbault F, Legrain M, Menin L, Guenneugues M, Schott V, Vovelle F, Dimarcq JL Protein Sci. 2004 Mar;13(3):703-13. PMID:14978308 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Defensin 3D structures

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