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They have attracted interest as novel compounds with the potential to treat infections associated with multi\u2010drug resistant bacteria. In this study, we investigate piscidin 3 (P3), an AMP that was first discovered in the mast cells of hybrid striped bass. Prior studies showed that P3 is less active than its homolog piscidin 1 (P1) against planktonic bacteria. However, P3 has the advantage of being less toxic to mammalian cells and more active on biofilms and persister cells. Both P1 and P3 cross bacterial membranes and co\u2010localize with intracellular DNA but P3 is more condensing to DNA while P1 is more membrane active. Recently, we showed that both peptides coordinate Cu<jats:sup>2+<\/jats:sup> through an amino\u2010terminal copper and nickel (ATCUN) motif. We also demonstrated that the bactericidal effects of P3 are linked to its ability to form radicals that nick DNA in the presence of Cu<jats:sup>2+<\/jats:sup>. Since metal binding and membrane crossing by P3 is biologically important, we apply in this study solid\u2010state NMR spectroscopy to uniformly <jats:sup>13<\/jats:sup>C\u2010<jats:sup>15<\/jats:sup>N\u2010labeled peptide samples to structurally characterize the ATCUN motif of P3 bound to bilayers and coordinated to Ni<jats:sup>2+<\/jats:sup> and Cu<jats:sup>2+<\/jats:sup>. These experiments are supplemented with density functional theory calculations. Taken together, these studies refine the arrangement of not only the backbone but also side chain atoms of an AMP simultaneously bound to metal ions and phospholipid bilayers.<\/jats:p>","DOI":"10.1002\/cphc.201800855","type":"journal-article","created":{"date-parts":[[2018,11,24]],"date-time":"2018-11-24T11:29:16Z","timestamp":1543058956000},"page":"295-301","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["Metal\u2010ion Binding to Host Defense Peptide Piscidin 3 Observed in Phospholipid Bilayers by Magic Angle Spinning Solid\u2010state NMR"],"prefix":"10.1002","volume":"20","author":[{"given":"Ratan Kumar","family":"Rai","sequence":"first","affiliation":[{"name":"Department of Chemistry and Biochemistry University of California San Diego  La Jolla, California 92093-0307 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