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. 1990 Dec;172(12):6892–6899. doi: 10.1128/jb.172.12.6892-6899.1990

Catabolism of bis(5'-nucleosidyl) tetraphosphates in Saccharomyces cerevisiae.

P Plateau 1, M Fromant 1, J M Schmitter 1, S Blanquet 1
PMCID: PMC210808  PMID: 2174863

Abstract

Bis(5'-adenosyl) tetraphosphate (Ap4A) phosphorylase II (P. Plateau, M. Fromant, J. M. Schmitter, J. M. Buhler, and S. Blanquet, J. Bacteriol. 171:6437-6445, 1989) was obtained in a homogeneous form through a 40,000-fold purification, starting from a Saccharomyces cerevisiae strain devoid of Ap4A phosphorylase I activity. The former enzyme behaves as a 36.8K monomer. As with Ap4A phosphorylase I, the addition of divalent cations is required for the expression of activity. Mn2+, Mg2+, and Ca2+ sustain phosphorolysis by the two enzymes, whereas Co2+ and Cd2+ stimulate only phosphorylase II activity. All bis(5'-nucleosidyl) tetraphosphates assayed (Ap4A, Ap4C, Ap4G, Ap4U, Gp4G, and Gp4U) are substrates of the two enzymes. However, Ap4A phosphorylase II shows a marked preference for A-containing substrates. The two enzymes catalyze adenosine 5'-phosphosulfate phosphorolysis or an exchange reaction between Pi and the beta-phosphate of any nucleoside diphosphate. They can also produce Ap4A at the expense of ATP and ADP. The gene (APA2) encoding Ap4A phosphorylase II was isolated and sequenced. The deduced amino acid sequence shares 60% identity with that of Ap4A phosphorylase I. Disruption of APA2 and/or APA1 shows that none of these genes is essential for the viability of Saccharomyces cerevisiae. The concentrations of all bis(5'-nucleosidyl) tetraphosphates are increased in an apa1 apa2 double mutant, as compared with the parental wild-type strain. The factor of increase is 5 to 50 times, depending on the nucleotide. This observation supports the conclusion that, in vivo, Ap4A phosphorylase II, like Ap4A phosphorylase I, participates in the catabolism rather than the synthesis of the bis(5'-nucleosidyl) tetraphosphates.

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Selected References

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