کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5915076 | 1162771 | 2010 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Dynamics and orientation of a cationic antimicrobial peptide in two membrane-mimetic systems
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شناسی مولکولی
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چکیده انگلیسی
In order to investigate the functional and structural properties of cationic α-helical peptides in two different membranes, we studied the 20-residue peptide maximin H6 in two membrane-mimetic systems by NMR spectroscopy using partially 15N-labeled peptide and paramagnetic relaxation enhancements. Maximin H6, which is found in skin secretions of frogs of the Bombinae family, attacks gram-negative bacteria and acts haemolytically. While the peptide spontaneously folds into similar structures in both neutral dodecylphosphocholine (DPC) and negatively charged sodium dodecyl sulphate (SDS) micelles, its structure is more flexible in SDS as shown by 15N relaxation measurements. In addition, it is bound closer to the surface of the micelle and rotated by â¼70° around its helix axis in the negatively charged membrane surrogate compared to the structure in DPC. This might form the basis for peptide-peptide interactions through a GxxxG motif, which could finally lead to membrane disruption and, thus, preferential attack of negatively charged microbial cell walls.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Structural Biology - Volume 170, Issue 1, April 2010, Pages 172-179
Journal: Journal of Structural Biology - Volume 170, Issue 1, April 2010, Pages 172-179
نویسندگان
Simone Kosol, Klaus Zangger,