Catalyzes the reaction: 2 iodide + L-tyrosine + 2 NADP+ = 3,5-diiodo-L-tyrosine + H+ + 2 NADPH. Note that this activity has only been demonstrated in the direction of 3-deiodination. 3-bromo-L-tyrosine and 3-chloro-L-tyrosine can also be used as substrates.
iodide peroxidase-tyrosine iodinase activity