2dcx

NMR solution structure of the Dermaseptin antimicrobial peptide analog NC12-K4S4(1-13)a

spinqualitylabelsall models 2dcx, 15 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2dcx is a 1 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DOA NonStd Res: NH2 Related: 2dd6 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function [DMS4_PHYSA] Possesses a potent antimicrobial activity against Gram-negative and Gram-positive bacteria, fungi, protozoa, and the enveloped herpes simplex virus type 1. Probably acts by disturbing membrane functions with its amphipathic structure. Binds to healthy erythrocytes (this binding is receptor independent), and has strong hemolytic activity. Does not bind to P.falciparum infected erythrocytes, but accumulates within the parasite. Kills the parasite, and only at high concentrations has a hemolytic activity on the host cell. Publication Abstract from PubMed 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. 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 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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