Abstract
An alkaline 5′-phosphodiesterase (5′-PDE) from barley (Hordeum distichum) malt sprouts was partially purified by thermal treatment and acetone precipitation to diminish phosphomonoesterase (PME) activity. 5′-PDE was purified 40-fold to a specific activity of 30 U mg−1 protein with a final yield of about 32%. With synthetic substrate, the enzyme had an optimum pH of 8.9, maximum activity at 70 °C over 10 min, and a Km of 0.26 mM. The partially purified enzyme was activated by 10 mM Mg2+ up to 168% of the original activity, while Zn2+, Mn2+ and Cu2+ ions, chelating agent (EDTA) and NaN3 (1–10 mM), and 5′-ribonucleotides (1–5 mM) were inhibitory. Final enzyme preparation was stable over 8 d at 4 °C), at 70 °C for up to 120 min and without loss of activity over 90 d at −18 °C.
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Beluhan, S., Karmeliíc, I., Novak, S. et al. Partial purification and biochemical characterization of alkaline 5′-phosphodiesterase from barley malt sprouts. Biotechnology Letters 25, 1099–1103 (2003). https://doi.org/10.1023/A:1024144215414
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DOI: https://doi.org/10.1023/A:1024144215414