
An HPLC assay for detection of elevated urinary S-sulphocysteine, a metabolic marker of sulphite oxidase deficiency.
Sulphite oxidase deficiency occurs in man in two forms, as the isolated deficiency and as a syndrome of combined molybdoenzyme deficiency. This latter pleiotropic condition has as its underlying cause a defect in the synthesis of the molybdenum cofactor required for the activity of all molybdoenzymes in humans. Difficulties in diagnosis of sulphite oxidase deficiency are often encountered. A new method for detection of a key diagnostic metabolite, S-sulphocysteine, is outlined. The procedure is based on precolumn derivatization of urinary amino acids with dimethylaminoazobenzene sulphonyl chloride (Dabsyl-Cl) and resolution of the modified S-sulphocysteine by reversed-phase HPLC. A number of affected patients and control individuals with similar clinical symptoms have been studied, and a clear demarcation between the two groups has been noted.
Duke Scholars
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Related Subject Headings
- Taurine
- Pteridines
- Oxidoreductases Acting on Sulfur Group Donors
- Molybdenum Cofactors
- Molybdenum
- Metalloproteins
- Metabolism, Inborn Errors
- Humans
- Genetics & Heredity
- Cysteine
Citation

Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Taurine
- Pteridines
- Oxidoreductases Acting on Sulfur Group Donors
- Molybdenum Cofactors
- Molybdenum
- Metalloproteins
- Metabolism, Inborn Errors
- Humans
- Genetics & Heredity
- Cysteine