کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10871069 | 1074033 | 2013 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Understanding inositol pyrophosphate metabolism and function: Kinetic characterization of the DIPPs
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کلمات کلیدی
موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
We illuminate the metabolism and the cell-signaling activities of inositol pyrophosphates, by showing that regulation of yeast cyclin-kinase by 1-InsP7 is not conserved for mammalian CDK5, and by kinetically characterizing Ddp1p/DIPP-mediated dephosphorylation of 1-InsP7, 5-InsP7 and InsP8. Each phosphatase exhibited similar Km values for every substrate (range: 35-148 nM). The rank order of kcat values (1-InsP7 > 5-InsP7 = InsP8) was identical for each enzyme, although DIPP1 was 10- to 60-fold more active than DIPP2α/β and DIPP3α/β. We demonstrate InsP8 dephosphorylation preferentially progresses through 1-InsP7. Conversely, we conclude that the more metabolically and functionally significant steady-state route of InsP8 synthesis proceeds via 5-InsP7.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: FEBS Letters - Volume 587, Issue 21, 1 November 2013, Pages 3464-3470
Journal: FEBS Letters - Volume 587, Issue 21, 1 November 2013, Pages 3464-3470
نویسندگان
Rajagopal S. Kilari, Jeremy D. Weaver, Stephen B. Shears, Stephen T. Safrany,