کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2830133 | 1163358 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Biochemical and biophysical properties of a highly active recombinant arginase from Leishmania (Leishmania) amazonensis and subcellular localization of native enzyme
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کلمات کلیدی
ORFGFPIMACiNOSIFAImmunolocalization - ایمونولوکالیزاسیونProtein structure - ساختار پروتئینinducible nitric oxide synthase - سنتاز اکسید نیتریک القاییDrug design - طراحی دارو open reading frame - قاب خواندن بازNitric oxide - نیتریک اکسیدgreen fluorescent protein - پروتئین فلورسنت سبزimmobilized metal affinity chromatography - کروماتوگرافی وابسته به فلز متمرکزIEC - کمیسیون مستقل انتخابات
موضوعات مرتبط
علوم زیستی و بیوفناوری
بیوشیمی، ژنتیک و زیست شناسی مولکولی
زیست شناسی مولکولی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Arginase (l-arginine amidinohydrolase, E.C. 3.5.3.1) is a metalloenzyme that catalyses the hydrolysis of l-arginine to l-ornithine and urea. In Leishmania spp., the biological role of the enzyme may be involved in modulating NO production upon macrophage infection. Previously, we cloned and characterized the arginase gene from Leishmania (Leishmania) amazonensis. In the present work, we successfully expressed the recombinant enzyme in E. coli and performed biochemical and biophysical characterization of both the native and recombinant enzymes. We obtained KM and Vmax values of 23.9(±0.96) mM and 192.3 μmol/min mg protein (±14.3), respectively, for the native enzyme. For the recombinant counterpart, KM was 21.5(±0.90) mM and Vmax was 144.9(±8.9) μmol/min mg. Antibody against the recombinant protein confirmed a glycosomal cellular localization of the enzyme in promastigotes. Data from light scattering and small angle X-ray scattering showed that a trimeric state is the active form of the protein. We determined empirically that a manganese wash at room temperature is the best condition to purify active enzyme. The interaction of the recombinant protein with the immobilized nickel also allowed us to confirm the structural disposition of histidine at positions 3 and 324. The determined structural parameters provide substantial data to facilitate the search for selective inhibitors of parasitic sources of arginase, which could subsequently point to a candidate for leishmaniasis therapy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Molecular and Biochemical Parasitology - Volume 159, Issue 2, June 2008, Pages 104-111
Journal: Molecular and Biochemical Parasitology - Volume 159, Issue 2, June 2008, Pages 104-111
نویسندگان
Edson Roberto da Silva, Maria Fernanda Laranjeira da Silva, Hannes Fischer, Renato A. Mortara, Mario Gustavo Mayer, Karine Framesqui, Ariel Mariano Silber, Lucile Maria Floeter-Winter,