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. 1975 Aug;149(2):329–339. doi: 10.1042/bj1490329

Higher-plant cyclic nucleotide phosphodiesterases. Resolution, partial purification and properties of three phosphodiesterases from potato tuber.

A R Ashton, G M Polya
PMCID: PMC1165626  PMID: 241333

Abstract

1. Three phosphodiesterases that are capable of hydrolysing 3':5'-cyclic nucleotides were purified from potato tubers. 2. The phosphodiesterases were fractionated by (NH4)2SO4 precipitation and CM-cellulose chromatography. The phosphodiesterases were resolved from each other and further purified by gel filtration in high- and low-ionic-strength conditions. 3. All three enzymes lacked significant nucleotidase activity. 4. Enzymes I and II had mol. wts. 240,000 and 80,000 respectively, determined by gel filtration, whereas enzyme III showed anomalous behaviour on gel filtration, behaving as a high- or low-molecular-weight protein in high- or low-ionic-strength buffers respectively. 5. All enzymes hydrolysed 2':3'-cyclic nucleotides as well as 3':5'-cyclic nucleotides. The enzymes also had nucleotide pyrophosphatase activity, hydrolysing NAD+ and UDP-glucose to various extents. Enzymes I and II hydrolyse cyclic nucleotides at a greater rate than NAD+, whereas enzyme III hydrolyses NAD+ at a much greater rate than cyclic nucleotides. All three enzymes hydrolysed the artificial substrate bis-(p-nitro-phenyl) phosphate. 6. The enzymes do not require the addition of bivalent cations for activity. 7. Both enzymes I and II have optimum activity at pH6 with 3':5'-cyclic AMP and bis-(p-nitrophenyl) phosphate as substrates. The products of 3':5'-cyclic AMP hydrolysis were 3'-AMP and 5'-AMP, the ratio of the two products being different for each enzyme and varying with pH. 8. Theophylline inhibits enzymes I and II slightly, but other methyl xanthines have little effect. Enzymes I and II were competitively inhibited by many nucleotides containing phosphomonoester and phosphodiester bonds, as well as by Pi. 9. The possible significance of these phosphodiesterases in cyclic nucleotide metabolism in higher plants is discussed.

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Selected References

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