1i2u

NMR SOLUTION STRUCTURES OF ANTIFUNGAL HELIOMICIN

spinqualitylabelsall models 1i2u Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1i2u is a 1 chain structure with sequence from Heliothis virescens. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Solution NMR, 18 models Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function DEFN_HELVI This peptide has potent anti-fungal activity. Has no activity against Gram-negative and Gram-positive bacteria. Publication Abstract from PubMed In response to an experimental infection, the lepidopteran Heliothis virescens produces an antifungal protein named heliomicin. Heliomicin displays sequence similarities with antifungal plant defensins and antibacterial or antifungal insect defensins. To gain information about the structural elements required for either antifungal or antibacterial activity, heliomicin and selected point-mutated variants were expressed in yeast as fusion proteins. The effects of mutations, defined by comparing the primary structure of heliomicin with the sequences of members of the insect defensin family, were analyzed using antibacterial and antifungal assays. One of the variants shows significant activity against Gram-positive bacteria while remaining efficient against fungi. The three-dimensional structures of this variant and of the wild-type protein were determined by two-dimensional (1)H NMR to establish a correlation between structure and antibacterial or antifungal activity. Wild-type and mutated heliomicins adopt a similar scaffold, including the so-called cysteine-stabilized alphabeta motif. A comparison of their structures with other defensin-type molecules indicates that common hydrophobic characteristics can be assigned to all the antifungal proteins. A comparative analysis of various structural features of heliomicin mutant and of antibacterial defensins enables common properties to be assessed, which will help to design new mutants with increased antibacterial activity. Solution structures of the antifungal heliomicin and a selected variant with both antibacterial and antifungal activities.,Lamberty M, Caille A, Landon C, Tassin-Moindrot S, Hetru C, Bulet P, Vovelle F Biochemistry. 2001 Oct 9;40(40):11995-2003. PMID:11580275 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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