[Purine metabolism: determination of PRPP-amidotransferase and PRPP-synthetase in lymphocytes from patients with chronic lymphatic leukemia (CLL)].

Abstract

Phosphoribosyl-1-pyrophosphate (PRPP) amidotransferase is the "key anabolic enzyme" of purine nucleotide synthesis; PRPP synthetase connects the pentose cycle with the same pathway. We have studied their behavior in 5 control subjects and in 8 affected by CLL. Determination of PRPP amidotransferase was carried out through the evaluation of 14C-glutamic acid (released by 14C-glutamine) in the incubation mixture. PRPP synthetase was followed by adding ATP and ribose 5-phosphate to the incubation mixtures, and by evaluating the PRPP formed through the release of CO2 in a coupled reaction. In the case of PRPP-amidotransferase, our values are in the range reported in the literature: in patients affected by CLL, the enzyme activity is much higher and the increase is more evident when values referred to the patients, than when to the cells. Our values of PRPP synthetase are consistent with those of Peters and Veerkamp, but no definite conclusion is possible in the case of leukemic patients.

• Authors: A Tabucchi, L Terzuoli, A Di Stefano, M Pizzichini, R Leoncini, E Dispensa, E Marinello
• Journal: Bollettino della Societa italiana di biologia sperimentale (Boll Soc Ital Biol Sper) Vol. 65 Issue 11 Pg. 1097-103 (Nov 1989) ISSN: 0037-8771 [Print] Italy
• Vernacular Title: Metabolismo purinico: determinazione della PRPP-amidotransferasi e della PRPP-sintetasi in linfociti di pazienti affetti da leucemia linfatica cronica (LLC).
• PMID: 2560926 (Publication Type: English Abstract, Journal Article)

Chemical References

• Pentosyltransferases
• Amidophosphoribosyltransferase
• Phosphotransferases
• Ribose-Phosphate Pyrophosphokinase

Topics

• Amidophosphoribosyltransferase (metabolism)
• Humans
• Leukemia, Lymphocytic, Chronic, B-Cell (blood, enzymology)
• Lymphocytes (enzymology)
• Pentosyltransferases (metabolism)
• Phosphotransferases (metabolism)
• Ribose-Phosphate Pyrophosphokinase (metabolism)