کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5916201 1163370 2007 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Overexpression, purification and characterization of a hexahistidine-tagged recombinant extended nucleotide-binding domain 1 (NBD1) of the Cryptosporidium parvum CpABC3 for rational drug design
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شناسی مولکولی
پیش نمایش صفحه اول مقاله
Overexpression, purification and characterization of a hexahistidine-tagged recombinant extended nucleotide-binding domain 1 (NBD1) of the Cryptosporidium parvum CpABC3 for rational drug design
چکیده انگلیسی
Its natural resistance to antiprotozoal chemotherapy characterizes the intestinal protozoan parasite Cryptosporidium parvum and the P-glycoprotein-related multidrug resistance proteins such as CpABC3 could be involved. In order to design and study specific inhibitors of the CpABC3 nucleotide-binding domain, a hexahistidine-tagged recombinant protein encompassing the N-terminal cytosolic NBD1 domain was overexpressed in E. coli and purified. The 45 kDa H6-NBD1 displayed intrinsic fluorescent properties consistent with the presence of two Trp residues in a hydrophobic environment. The binding of ATP and the fluorescent analogue TNP-ATP produced a dose-dependent quenching as well as progesterone and the flavone quercetin. The extrinsic fluorescence of TNP-ATP was enhanced upon binding to H6-NBD1, which was only partially displaced by the natural substrate ATP. The recombinant protein hydrolyzed ATP (Km = 145.4 ± 18.2 μM), but ADP (Km = 4.3 ± 0.6 mM) and AMP (Km = 5.4 ± 1.5 μM) were also substrates. TNP-ATP is a competitive inhibitor of the catalytic activity (Ki = 36.6 ± 4.5 μM), but quercetin and progesterone were not inhibitors, evidencing different binding sites. The recombinant C. parvum H6-NBD1 should be a valuable tool for rational drug design and will allow the discrimination between specific inhibitors of the catalytic site and molecules binding to other sites.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular and Biochemical Parasitology - Volume 152, Issue 1, March 2007, Pages 101-107
نویسندگان
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