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Báo cáo khoa học: Xanthosine and xanthine Substrate properties with purine nucleoside phosphorylases, and relevance to other enzyme systems

Chia sẻ: Nguyen Thang | Ngày: | Loại File: PDF | Số trang:10

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Substrate properties of xanthine (Xan) and xanthosine (Xao) for purine nucleoside phosphorylases (PNP) of mammalian origin have been reported previously, but only at a single arbitrarily selected pH and with no kinetic con-stants. Additionally, studies have not taken into account the fact that, at physiological pH, Xao (pKa¼5.7) is a mono-anion, while Xan (pKa¼7.7) is an equilibrium mixture of the neutral and monoanionic forms.

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Nội dung Text: Báo cáo khoa học: Xanthosine and xanthine Substrate properties with purine nucleoside phosphorylases, and relevance to other enzyme systems

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