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- W2000200259 abstract "Calcineurin (CaN) is a heterodimer composed of a catalytic subunit A (CaNA) and a regulatory subunit B (CaNB). We report here an active truncated mutation of the rat CaNAδ that contains only the catalytic domain (residues 1-347, also known as a/CaNA). The pnitrophenyl phosphatase activity and protein phosphatase activity of a/CaNA were higher than that of CaNA. Both pnitrophenyl phosphatase activity and protein phosphatase activity of a/CaNA were unaffected by CaM and the B-subunit; the B-subunit and CaM have relatively little effect on pnitrophenyl phosphatase activity and a crucial effect on protein phosphatase activity of CaNA. Mn[2+] and Ni[2+] ions effeciently activated CaNA. The Km of a/CaNA was about 16 mM, and the kcat of a/CaNA was 10.03 1/s using pNPP as substrate. With RII peptide as a substrate, the Km of a/CaNA was about 21 uM and the kcat of a/CaNA was 0.51 1/s. The optimum reaction temperature was about 45C, and the optimum reaction pH was about 7.2. Our results indicate that a/CaNA is the catalytic core of CaNA, and CaN and the Bsubunit binding domain itself might play roles in the negative regulation of the phosphatase activity of CaN. The results provide the basis for future studies on the catalytic domain of CaN." @default.
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- W2000200259 date "2003-01-07" @default.
- W2000200259 modified "2023-10-11" @default.
- W2000200259 title "The Catalytically Active Domain in the A Subunit of Calcineurin" @default.
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- W2000200259 doi "https://doi.org/10.1515/bc.2003.158" @default.
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