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Related Experiment Videos

Human hypoxanthine-guanine phosphoribosyltransferase.

J M Wilson, R Kobayashi, I H Fox

    The Journal of Biological Chemistry
    |May 25, 1983
    PubMed
    Summary

    Researchers identified a specific mutation in the hypoxanthine-guanine phosphoribosyltransferase enzyme (HPRTToronto) linked to gout. This enzyme defect, an arginine to glycine change at position 50, results from a single nucleotide alteration.

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    Area of Science:

    • Biochemistry
    • Human Genetics
    • Enzymology

    Background:

    • Gout is often associated with purine metabolism disorders.
    • Hypoxanthine-guanine phosphoribosyltransferase (HPRT) deficiency can lead to hyperuricemia and gout.
    • A specific HPRT mutant (HPRTToronto) was identified in a gout patient.

    Purpose of the Study:

    • To elucidate the primary structural defect in the HPRTToronto enzyme.
    • To understand the molecular basis of HPRT deficiency in this patient.
    • To correlate enzyme mutation with gout pathogenesis.

    Main Methods:

    • Isolation of HPRTToronto from patient erythrocytes.
    • Peptide mapping using reverse-phase high-pressure liquid chromatography (RP-HPLC).
    • Amino acid sequencing of tryptic peptides.

    Main Results:

    • RP-HPLC revealed a single aberrant tryptic peptide in HPRTToronto.
    • Sequence analysis identified an arginine to glycine substitution at amino acid position 50.
    • This substitution is explained by a single nucleotide change (CGA to GGA) in the HPRT gene.

    Conclusions:

    • The HPRTToronto mutation involves an arginine to glycine substitution at position 50.
    • A point mutation in the HPRT gene is the cause of this enzyme deficiency.
    • This molecular finding provides insight into the genetic basis of gout in this patient.

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