嘌呤核苷磷酸化酶
嘌呤
嘌呤代谢
生产过剩
医学
生物化学
核苷
新陈代谢
内科学
化学
酶
作者
Amos Cohen,Deborah Doyle,David W. Martin,Arthur J. Ammann
标识
DOI:10.1056/nejm197612232952603
摘要
To delineate the normal function of purine nucleoside phosphorylase and to understand the pathogenesis of the immune dysfunction associated with deficiency of this enzyme, we studied purine metabolism in a patient deficient in purine nucleoside phosphorylase, her erythrocytes and cultured fibroblasts. She exhibited severe hypouricemia and hypouricosuria but excreted excessive amounts of purines in her urine, the major components of which were inosine and guanosine. Her urine also contained deoxyinosine, deoxyguanosine and uric acid 9-N riboside. The patient's erythrocytes but not her cultured fibroblasts contained increased concentrations of phosphoribosylpyrophosphate and inosine. The metabolic abnormalities resembled those in the erythrocytes of patients with the Lesch-Nyhan syndrome. Purine nucleoside phosphorylase is a necessary component of the major, if not the sole, pathway for the conversion of purine nucleosides and nucleotides to uric acid. The increased intracellular concentrations of inosine may, by inhibiting adenosine deaminase, be related to the immunologic dysfunction.
科研通智能强力驱动
Strongly Powered by AbleSci AI