PMID: 8593541Oct 1, 1995Paper

Biotinylation of histones by human serum biotinidase: assessment of biotinyl-transferase activity in sera from normal individuals and children with biotinidase deficiency

Biochemical and Molecular Medicine
Jeanne HymesB Wolf

Abstract

Serum biotinidase has biotinyl-transferase activity in addition to biocytin hydrolase activity. A sensitive assay for biotinyl-transferase activity was developed based on the transfer of biotin from biocytin to histones. Biotinidase biotinyl-transferase occurs at physiological and alkaline pHs, whereas hydrolysis of biocytin occurs optimally at pH 4.5 to 6.0. Measurement of hydrolysis requires micromolar concentrations of biocytin, whereas biotinylation of histones can be detected readily at 1.5 nM biocytin. Because polylysine is readily biotinylated by biotinidase in the presence of biocytin, whereas polyarginine is not, the enzyme likely transfers biotin to the epsilon-amino group of lysyl residues. To determine if patients who are deficient in biocytin hydrolase activity are also deficient in biotinyl-transferase activity, serum from 103 children (25 identified by exhibiting clinical symptoms and 78 detected by newborn screening) with profound biotinidase deficiency (less than 10% of mean normal biotinyl-p-aminobenzoate hydrolyzing activity) were assessed for biotinyl-transferase activity and for the presence of cross-reacting material (CRM) to antibodies prepared against purified serum biotinidase. Sera from all symptomatic...Continue Reading

Citations

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