کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10764834 1050567 2010 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Topology and dynamics of melittin within the liposome revealed by a combination of mass spectrometry and chemical modification
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Topology and dynamics of melittin within the liposome revealed by a combination of mass spectrometry and chemical modification
چکیده انگلیسی
The topology and dynamics of melittin within the liposome were investigated by a mass spectrometry coupled with acetylation. The MALDI-TOF MS and MALDI-QIT-TOF MS/MS analyses revealed that only N-terminal amine of melittin was dominantly acetylated in the presence of liposome although all of four primary amines were completely and rapidly acetylated in aqueous solution. This result indicates that melittin adopts the N-terminal-outside transmembrane topology within the liposome. The time course of acetylation followed the first-order kinetics at any examined temperatures (6-30 °C). The rate constant was less than that of the acetylation of melittin in aqueous solution. The activation energy for acetylation (74 kJ mol−1) was comparable to that for dissociation of a lipid monomer from the membrane, suggesting a float-like longitudinal motion of melittin within the liposome. These results demonstrate that a mass spectrometry combined with chemical modification is very efficient way for clarifying the topology and dynamics of peptides bound to the membrane.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 397, Issue 1, 18 June 2010, Pages 1-4
نویسندگان
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