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Different autoantigens are thought to be involved in the pathogenesis of insulin-dependent diabetes mellitus, and they may account for the variation in the clinical presentation of the disease. Sera from patients with autoimmune polyendocrine syndrome type I contain autoantibodies against the beta-cell proteins glutamate decarboxylase and an unrelated 51-kDa antigen. By screening of an expression library derived from rat insulinoma cells, we have identified the 51-kDa protein as aromatic-L-amino-acid decarboxylase (EC 4.1.1.28). In addition to the previously published full-length cDNA, forms coding for a truncated and an alternatively spliced version were identified. Aromatic L-amino acid decarboxylase catalyzes the decarboxylation of L-5-hydroxytryptophan to serotonin and that of L-3,4-dihydroxyphenylalanine to dopamine. Interestingly, pyridoxal phosphate is the cofactor of both aromatic L-amino acid decarboxylase and glutamate decarboxylase. The biological significance of the neurotransmitters produced by the two enzymes in the beta cells remains largely unknown.
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