The chaperone role of the pyridoxal 5'-phosphate and its implications for rare diseases involving B6-dependent enzymes

Clinical Biochemistry
Barbara CelliniCarla Borri Voltattorni

Abstract

The biologically active form of the B6 vitamers is pyridoxal 5'-phosphate (PLP), which plays a coenzymatic role in several distinct enzymatic activities ranging from the synthesis, interconversion and degradation of amino acids to the replenishment of one-carbon units, synthesis and degradation of biogenic amines, synthesis of tetrapyrrolic compounds and metabolism of amino-sugars. In the catalytic process of PLP-dependent enzymes, the substrate amino acid forms a Schiff base with PLP and the electrophilicity of the PLP pyridine ring plays important roles in the subsequent catalytic steps. While the essential role of PLP in the acquisition of biological activity of many proteins is long recognized, the finding that some PLP-enzymes require the coenzyme for refolding in vitro points to an additional role of PLP as a chaperone in the folding process. Mutations in the genes encoding PLP-enzymes are causative of several rare inherited diseases. Patients affected by some of these diseases (AADC deficiency, cystathionuria, homocystinuria, gyrate atrophy, primary hyperoxaluria type 1, xanthurenic aciduria, X-linked sideroblastic anaemia) can benefit, although at different degrees, from the administration of pyridoxine, a PLP precursor...Continue Reading

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