Abstract
A two-step non-radioactive method that uses reverse-phase high-performance liquid chromatography (RP-HPLC) is described for the determination of phosphoribosylpyrophosphate synthetase (EC 2.7.6.1) activity in human erythrocytes. The method is accurate and easily reproducible in different chromatographic systems; it is based on the quantification of phosphoribosylpyrophosphate by conversion into orotidine monophosphate and uridine monophosphate. Phosphoribosylpyrophosphate synthetase activity was determined in the erythrocytes of healthy adults and children, the latter showing significantly higher activity than the former. The enzyme activity assayed in children with different neurological disorders was significantly lower in patients with Rett syndrome than in control children or in autistic or mentally retarded patients.
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