Abstract
The relationship between type I iodothyronine 5'-monodeiodinase (5'-MD) and protein disulphide isomerase (PDI) was investigated by using a synthetic 18-amino acid peptide (LAP475c), which corresponds to the sequence of amino acids at position 373-390 of PDI including its active site, and anti-LAP475c antibody. Western blot analysis revealed that our anti-LAP475c antibody was highly specific for 57K protein in solubilized rat liver microsomal protein (SRLMP) that corresponded to PDI. Anti-LAP475c IgG (1:100 dilution) precipitated 46% of 5'-MD. These data suggest that PDI may play a regulatory role in the 5'-monodeiodination reaction.
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