Journal
ACTA CRYSTALLOGRAPHICA SECTION D-STRUCTURAL BIOLOGY
Volume 68, Issue -, Pages 109-116Publisher
INT UNION CRYSTALLOGRAPHY
DOI: 10.1107/S090744491105133X
Keywords
peptaibols; peptide antibiotics; transmembrane ion channels; transition from 310-helix to a-helix
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The first crystal structure of a member of peptaibol antibiotic subfamily 4, trichovirin I-4A (14 residues), has been determined by direct methods and refined at atomic resolution. The monoclinic unit cell has two molecules in the asymmetric unit. Both molecules assume a 310 right-handed helical conformation and are significantly bent. The molecules pack loosely along the crystallographic twofold axis, forming two large tunnels between symmetry-related molecules in which no ordered solvent could be located. Carbonyl O atoms which are not involved in intramolecular hydrogen bonding participate in close van der Waals interactions with apolar groups. The necessary amphipathicity for biological activity of peptaibols is not realised in the crystal structure. Hence, a structural change of trichovirin to an a-helical conformation is similar to proposed for membrane integration and efficient water/ion transportation across the lipid bilayer.
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