Imbalance of purine metabolism in hepatomas of different growth rates as expressed in behavior of glutamine-phosphoribosylpyrophosphate amidotransferase (amidophosphoribosyltransferase, EC 2.4.2.14).

Abstract

The behavior of glutamine-phosphoribosylpyrophosphate amidotransferase (amidophosphoribosyltransferase, EC 2.4.2.14) was determined in normal, differentiating, and regenerating liver and in a spectrum of hepatomas of widely different growth rates. The liver and tumor enzymes were measured in 100,000 x g supernatants prepared from 20% tissue homogenates containing 0.25 M sucrose and 1 mM MgC12. Kinetic studies were carried out on the amidotransferase in the curde supernatant from liver and rapidly growing hepatoma 3924A so that under optimum standard assay conditions only the enzyme amount would be the limiting factor. The kinetic results showed that certain properties of the amidotransferase from liver and hepatoma were similar. The liver and hepatoma enzyme exhibited apparent Km's for: glutamine, 1.7 and 2.3 mM; MgC12, 0.7 and 1.1 mM, and phosphoribosylpyrophosphate. S0.5 for 0.9 and 0.4 mM, respectively...

• Authors: N Prajda, N Katunuma, H P Morris, G Weber
• Journal: Cancer research (Cancer Res) Vol. 35 Issue 11 Pt 1 Pg. 3061-8 (Nov 1975) ISSN: 0008-5472 [Print] United States
• PMID: 241484 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Purines
• Pentosyltransferases
• Amidophosphoribosyltransferase

Topics

• Amidophosphoribosyltransferase (metabolism)
• Animals
• Carcinoma, Hepatocellular (enzymology)
• Cell Differentiation
• Female
• Hydrogen-Ion Concentration
• Kinetics
• Liver (enzymology, growth & development)
• Liver Neoplasms (enzymology)
• Liver Regeneration
• Male
• Neoplasms, Experimental (enzymology)
• Pentosyltransferases (metabolism)
• Phenotype
• Pregnancy
• Purines (metabolism)
• Rats