کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1939294 | 1050758 | 2007 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Binding modes of L35 to α- and β-semihemoglobins: Structural insights into the inequivalence of α- and β-subunits of hemoglobin
دانلود مقاله + سفارش ترجمه
دانلود مقاله ISI انگلیسی
رایگان برای ایرانیان
کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شیمی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
It has been thought for several years that the greatly lowered oxygen affinity, high cooperativity, and heterotropic modulation displayed by tetrameric human hemoglobin (Hb) was an exclusive result of the assembly of high affinity α1β1 dimers into α2β2 tetramers. However, in recent times, it has been shown that α- and β-semihemoglobins, namely α(heme)β(apo) and α(apo)β(heme), which are dimers of Hb characterized by a high affinity for oxygen and lack of cooperativity do respond to effectors such as 2-[4-(3,5-dichlorophenylureido) phenoxy]-2-methylpropionic acid (L35), a bezafibrate (BZF) related compound, by decreasing the ligand affinity to a considerable extent (between 60- and 130-fold). In order to shed some light on the structural basis of this phenomenon, we have developed a binding mode of L35 to semihemoglobins through docking analysis using the program GRID. Molecular modelling studies did identify sites on semihemoglobins where favourable interactions with L35 can occur. We found that the effector binds differently to the two semihemoglobins exhibiting high affinity only for the α chain heme pocket. The proposed binding models are consistent with the experimental findings and may be rationalized in terms of different hydrophobic and hydrophilic characteristics between α- and β-heme pockets of Hb.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical and Biophysical Research Communications - Volume 354, Issue 3, 16 March 2007, Pages 720-726
Journal: Biochemical and Biophysical Research Communications - Volume 354, Issue 3, 16 March 2007, Pages 720-726
نویسندگان
M. Cristina De Rosa, Cristiana Carelli Alinovi, Annamaria Russo, Bruno Giardina,