کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10870554 1074010 2014 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Protein phosphatase 2A regulates deoxycytidine kinase activity via Ser-74 dephosphorylation
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Protein phosphatase 2A regulates deoxycytidine kinase activity via Ser-74 dephosphorylation
چکیده انگلیسی
Deoxycytidine kinase (dCK) is a critical enzyme for activation of anticancer nucleoside analogs. Its activity is controlled via Ser-74 phosphorylation. Here, we investigated which Ser/Thr phosphatase dephosphorylates Ser-74. In cells, the PP1/PP2A inhibitor okadaic acid increased both dCK activity and Ser-74 phosphorylation at concentrations reported to specifically target PP2A. In line with this, purified PP2A, but not PP1, dephosphorylated recombinant pSer-74-dCK. In cell lysates, the Ser-74-dCK phosphatase activity was found to be latent, Mn2+-activated, responsive to PP2A inhibitors, and diminished after PP2A-immunodepletion. Use of siRNAs allowed concluding definitively that PP2A constitutively dephosphorylates dCK in cells and negatively regulates its activity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 588, Issue 5, 3 March 2014, Pages 727-732
نویسندگان
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