2dd6

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Revision as of 07:25, 21 November 2007

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Solution structure of Dermaseptin antimicrobial peptide truncated, mutated analog, K4-S4(1-13)a

Overview

Acyl conjugation to antimicrobial peptides is known to enhance, antimicrobial properties. Here, we investigated the consequences of, aminolauryl (NC(12)) conjugation to the dermaseptin derivative, K(4)-S4-(1-13) (P) on binding properties to bilayer models mimicking, bacterial plasma membrane, which is often cited as the ultimate site of, action. Isothermal titration calorimetry revealed that acylation was, responsible for enhancing the binding affinity of NC(12)-P compared with P, (K = 13 x 10(5) and 1.5 x 10(5) m(-1), respectively). Surface plasmon, resonance measurements confirmed the isothermal titration calorimetry, results (K(app) = 12.6 x 10(5) and 1.53 x 10(5) m(-1), respectively) and, further indicated that enhanced adhesion affinity (K(adhesion) = 3 x 10(5), and 1 x 10(5) m(-1), respectively) was coupled to enhanced tendency to, insert within the bilayer (K(insertion) = 4.5 and 1.5, respectively). To, gain insight into the molecular basis for these observations, we, investigated the three-dimensional structures in the presence of, dodecylphosphocholine using NMR. The ensemble of NMR-calculated structures, (backbone root mean square deviation <0.6 A) showed that the acyl moiety, was responsible for a significant molecular reorganization, possibly, affecting the electrostatic potential distribution in NC(12)-P relative to, that of P. The combined data present compelling evidence in support of the, hypothesis that N-acylation affects antimicrobial properties by modifying, the secondary structure of the peptide in a manner that facilitates, contact with the membrane and consequently increases its disruption.

About this Structure

2DD6 is a Single protein structure of sequence from [1] with NH2 as ligand. Full crystallographic information is available from OCA.

Reference

Consequences of N-acylation on structure and membrane binding properties of dermaseptin derivative K4-S4-(1-13)., Shalev DE, Rotem S, Fish A, Mor A, J Biol Chem. 2006 Apr 7;281(14):9432-8. Epub 2005 Dec 30. PMID:16407175

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