title: NMR structure determination and calcium binding effects of lipopeptide antibiotic daptomycin.
abstract: Daptomycin is an acidic lipopeptide antibiotic, whose three-dimensional structure and mechanism of action is currently unknown. Recently daptomycin, trade name Cubicin, was approved as a drug for the treatment of skin-related infections (M. Larkin Lancet, 2003, 3, 677) and became the first antibiotic of its class to be used in the clinic (A. Raja et al., Nature Rev. Drug Discov., 2003, 2, 943-944). We have carried out a systematic high field NMR study of daptomycin and its binding to calcium ions which is essential for antibiotic activity. In this first report, we demonstrate the sequence-specific resonance assignment of daptomycin under resolved NMR measurement conditions. In addition to this, we have determined the 3D structure of apo-daptomycin and demonstrated a 1 : 1 stoichiometry on the binding to calcium ions. We have also demonstrated that the binding of calcium ions does not result in major conformational changes, but does induce aggregation. This may be an important factor in the mode of action of daptomycin.
authors.affiliation: Department of Chemistry, University of Manchester Institute of Science and Technology, PO Box 88, Manchester, UKM60 1QD.
authors.forename: Lee-Jon
authors.initials: LJ
authors.lastname: Ball
authors.forename: Catherine M
authors.initials: CM
authors.lastname: Goult
authors.forename: James A
authors.initials: JA
authors.lastname: Donarski
authors.forename: Jason
authors.initials: J
authors.lastname: Micklefield
authors.forename: Vasudevan
authors.initials: V
authors.lastname: Ramesh
mesh_terms: D000595:Amino Acid Sequence; D000900:Anti-Bacterial Agents / Q000737:chemistry* / Q000378:metabolism*; D001059:Apoproteins / Q000737:chemistry / Q000378:metabolism; D002118:Calcium / Q000378:metabolism* / Q000494:pharmacology; D017576:Daptomycin / Q000737:chemistry* / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D008958:Models, Molecular; D008969:Molecular Sequence Data; D019906:Nuclear Magnetic Resonance, Biomolecular; D017434:Protein Structure, Tertiary / Q000187:drug effects; D017186:Titrimetry
chemical_list: D000900:Anti-Bacterial Agents; D001059:Apoproteins; D017576:Daptomycin; D002118:Calcium