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Human hypoxanthine-guanine phosphoribosyltransferase deficiency. The molecular defect in a patient with gout (HPRTAshville).

作者信息

Davidson B L, Pashmforoush M, Kelley W N, Palella T D

机构信息

Department of Biological Chemistry, University of Michigan Medical School, Ann Arbor 48109.

出版信息

J Biol Chem. 1989 Jan 5;264(1):520-5.

PMID:2909537
Abstract

The genetic basis of hypoxanthine-guanine phosphoribosyltransferase (HPRT) deficiency has been identified by nucleotide sequence analysis of HPRT cDNAs cloned from a patient with gout. A single nucleotide change was identified in two independent clones: an A to G transition at nucleotide 602. Confirmation of a mutation at this site was provided by RNase mapping analysis. The predicted consequence of this transition is an aspartic acid to glycine substitution at amino acid 201. We have designated this variant HPRTAshville. Prior to this report, enzyme activity in HPRTAshville had not been detected by routine assay. Using more sensitive techniques, including an in situ gel assay for HPRT activity, we were able to demonstrate electrophoretic, kinetic, and structural differences between HPRTAshville and normal HPRT. Electrophoretic migration of HPRTAshville has elevated Michaelis constants for 5-phosphoribosyl-1-pyrophosphate and hypoxanthine. Predicted secondary structural alterations may result from the aspartic acid to glycine substitution.

摘要

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