Effect of divalent cations on the structure of the antibiotic daptomycin View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2008-04

AUTHORS

Steven W. Ho, David Jung, Jennifer R. Calhoun, James D. Lear, Mark Okon, Walter R. P. Scott, Robert E. W. Hancock, Suzana K. Straus

ABSTRACT

Daptomycin, a cyclic anionic lipopeptide antibiotic, whose three-dimensional structure was recently solved using solution state NMR (Ball et al. 2004; Jung et al. 2004; Rotondi and Gierasch 2005), requires calcium for function. To date, the exact nature of the interaction between divalent cations, such as Ca(2+) or Mg(2+), has not been fully characterized. It has, however, been suggested that addition of Ca(2+) to daptomycin in a 1:1 molar ratio induces aggregation. Moreover, it has been suggested that certain residues, e.g. Asp3 and Asp7, which are essential for activity (Grunewald et al. 2004; Kopp et al. 2006), may also be important for Ca(2+) binding (Jung et al. 2004). In this work, we have tried: (1) to further pinpoint how Ca(2+) affects daptomycin structure/oligomerization using analytical ultracentrifugation; and (2) to determine whether a specific calcium binding site exists, based on one-dimensional (13)C NMR spectra and molecular dynamics (MD) simulations. The centrifugation results indicated that daptomycin formed micelles of between 14 and 16 monomers in the presence of a 1:1 molar ratio of Ca(2+) and daptomycin. The (13)C NMR data indicated that addition of calcium had a significant effect on the Trp1 and Kyn13 residues, indicating that either calcium binds in this region or that these residues may be important for oligomerization. Finally, the molecular dynamics simulation results indicated that the conformational change of daptomycin upon calcium binding might not be as significant as originally proposed. Similar studies on the divalent cation Mg(2+) are also presented. The implication of these results for the biological function of daptomycin is discussed. More... »

PAGES

421-433

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00249-007-0227-2

DOI

http://dx.doi.org/10.1007/s00249-007-0227-2

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028390293

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/17968536


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