Abstract
The bovine pro-oxytocin precursor consists of the nonapeptide hormone and its neurophysin carrier protein that contains at its C-terminus a rudimentary processing signal, the single basic amino acid residue histidine. An exopeptidase has been isolated from neurosecretory granules of the bovine posterior pituitary that releases the supernumary histidine residue from the pro-hormone precursor. Based on its sensitivity to inhibitors and activators the enzyme has carboxypeptidase B-like properties with a pH optimum between 5.0 and 5.5.
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