Structure analysis of the membrane-bound dermcidin-derived peptide SSL-25 from human sweat.
Structure analysis of the membrane-bound dermcidin-derived peptide SSL-25 from human sweat.
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人体汗液膜结合 dermcidin 衍生肽 SSL-25 的结构分析
DOI:
10.1016/j.bbamem.2017.09.004
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
A.S. Ulrich
中科院分区:
文献类型:
--
作者:
P. Mühlhäuser;P. Wadhwani;E. Strandberg;J. Bürck;A.S. Ulrich
SSL-25 (SSLLEKGLDGAKKAVGGLGKLGKDA) is one of the shortest peptides present in human sweat and is produced after the proteolytic processing of the parent peptide dermcidin. Both peptides are reported to have antimicrobial function. To determine the structure of SSL-25 in lipid bilayers, a series of19F-labeled SSL-25 analogs were synthesized. Circular dichroism (CD) analysis showed that SSL-25 and all of its analogs formed α-helices in the presence of lipid vesicles, thus allowing a detailed analysis via oriented CD and solid-state NMR. The results suggest that SSL-25 resides on the membrane surface with a slight helix tilt angle. A detailed19F NMR analysis revealed that SSL-25 does not form a continuous helix. The α-helical structure of the N-terminal part of the peptide was preserved in membranes of different lipid compositions and at various peptide-to-lipid molar ratios, but the C-terminus was disordered and did not fold into a well-defined α-helical conformation. Furthermore, the NMR results showed that SSL-25 resides on the membrane surface and does not re-orient into the membrane in response to changes in either peptide concentration or membrane composition. SSL-25 does not aggregate and remains fully mobile within the membrane bilayer, as shown by19F NMR. SSL-25 has a high binding affinity toward bilayers mimicking bacterial lipid compositions, but does not bind to mammalian model membranes containing cholesterol. These observations may explain the selectivity of this peptide for bacterial membranes, and they are also in line with basic biophysical considerations on spontaneous lipid curvature and the general effect of cholesterol on peptide/lipid interactions.
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影响因子:
64.5
作者:
Walther, Torsten H.;Gottselig, Christina;Ulrich, Anne S.
通讯作者:
Ulrich, Anne S.
影响因子:
2.1
作者:
A. Ulrich
通讯作者:
A. Ulrich
影响因子:
3.4
作者:
Hung, Wei-Chin;Lee, Ming-Tao;Huang, Huey W.
通讯作者:
Huang, Huey W.
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
P. Wadhwani;Pierre Tremouilhac;E. Strandberg;S. Afonin;S. Grage;Marco Ieronimo;Marina Berditsch;A. Ulrich
通讯作者:
A. Ulrich
影响因子:
2.9
作者:
SREERAMA, N;WOODY, RW
通讯作者:
WOODY, RW