کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5372124 1503979 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Investigation of the four cooperative unfolding units existing in the MICAL-1 CH domain
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی تئوریک و عملی
پیش نمایش صفحه اول مقاله
Investigation of the four cooperative unfolding units existing in the MICAL-1 CH domain
چکیده انگلیسی

The solution structure of human MICAL-1 calpolnin homology (CH) domain is composed of six α helices and one 310 helix. To study the unfolding of this domain, we carry out native-state hydrogen exchange, intrinsic fluorescence and far-UV circular dichroism experiments. The free energy of unfolding, ΔGH2O, is calculated to be 7.11 ± 0.58 kcal mol− 1 from GuHCl denaturation at pH 6.5. Four cooperative unfolding units are found using native-state hydrogen exchange experiment. Forty-seven slow-exchange residues can be studied by native-state hydrogen exchange experiments. From the concentration dependence of exchange rates, free energy of amide hydrogen with solvent, ΔGHX and m-value (sensitivity of exposure to denaturant) are obtained, which reveal four cooperative unfolding units. The slowest exchanging protons are distributed throughout the whole hydrophobic core of the protein, which might be the folding core. These results will help us understand the structure of MICAL-1 CH domain more deeply.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biophysical Chemistry - Volume 129, Issues 2–3, September 2007, Pages 269-278
نویسندگان
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