1g8c

STRUCTURE OF THE BOVINE ANTIMICROBIAL PEPTIDE INDOLICIDIN BOUND TO SODIUM DODECYL SULFATE MICELLES

spinqualitylabelsall models 1g8c Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1g8c 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 Ligands: NH2 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CTHL4_BOVIN Potent microbicidal activity; active against S.aureus and E.coli. Publication Abstract from PubMed Indolicidin is a cationic, 13-residue antimicrobial peptide (ILPWKWPWWPWRR-NH(2)) which is unusually rich in tryptophan and proline. Its antimicrobial action involves the bacterial cytoplasmic membrane. Fluorescence and circular dichroism spectra demonstrated the structural similarity of indolicidin in complexes with large unilamellar phospolipid vesicles and with detergent micelles. The structure of indolicidin bound to zwitterionic dodecylphosphocholine (DPC) and anionic sodium dodecyl sulfate (SDS) micelles was determined using NMR methods and shown to represent a unique membrane-associated peptide structure. The backbone structure in DPC, well defined between residues 3 and 11, was extended, with two half-turns at residues Lys-5 and Trp-8. The backbone structure in SDS, well defined between residues 5 and 11, was also extended, but lacked the bend in the C-terminal half. Indolicidin in complexes with DPC had a central hydrophobic core composed of proline and tryptophan, which was bracketed by positively charged regions near the peptide termini. The tryptophan side chains, with one exception, folded flat against the peptide backbone, thus giving the molecule a wedge shape. Indolicidin in complexes with SDS had an arrangement of hydrophobic and cationic regions similar to that found in the presence of DPC. The tryptophan side chains were less well defined than for indolicidin in DPC and extended away from the peptide backbone. The preferred location of indolicidin in DPC micelles and lipid bilayers, analyzed using spin-label probes, was at the membrane interface. Structure of the bovine antimicrobial peptide indolicidin bound to dodecylphosphocholine and sodium dodecyl sulfate micelles.,Rozek A, Friedrich CL, Hancock RE Biochemistry. 2000 Dec 26;39(51):15765-74. PMID:11123901 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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