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Structural Framework for the Modulation of the Activity of the Hybrid Antibiotic Peptide Cecropin A-Melittin [CA(1-7)M(2-9)] by N(ε) -Lysine Trimethylation

AuthorsDíaz, Dolores ; García de la Torre, Beatriz; Fernández-Reyes, María ; Rivas, Luis ; Andreu, David; Jiménez-Barbero, Jesús
Keywordsantimicrobial peptides (AMPs)
cecropin A
NMR spectroscopy
Issue Date19-Sep-2011
CitationChembiochem 12(14):2177-2183(2011)
AbstractThe 3D structures of six linear pentadecapeptides derived from the cecropin A–melittin antimicrobial peptide CA(1–7)M(2–9) [KWKLFKKIGAVLKVL-NH2] have been studied. These analogues are modified by ε-NH2 trimethylation of one or more lysine residues and showed variation in both antimicrobial and cytotoxic activities, depending on the number and position of modified lysines. Since it is expected that these peptides will display a strong conformational ordering when in contact with membranes, we have investigated their structure on the basis of the data extracted from NMR experiments performed in membrane-mimetic environments. We show that inclusion of Nε-trimethylated lysine residues induces a certain degree of structural flexibility, while preserving to a variable extent a largely α-helical structure. In addition, peptide orientation with respect to SDS micelles has been explored by detection of the intensity changes of peptide NMR signals upon addition of a paramagnetic probe (Mn2+ ions)
Description7 pag.- 6 fig.- 1 tab.
Publisher version (URL)http://dx.doi.org/10.1002/cbic.201100269
Appears in Collections:(CIB) Artículos
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