Abstract
The molecular weight of newly synthesized dipeptidyl carboxypeptidase (angiotensin-converting enzyme; peptidyldipeptide hydrolase, EC 3.4.15.1) polypeptide primed in a reticulocyte lysate by poly(A)-containing RNA from mature rabbit testis was only about 65% that of the immunologically related species programmed by pulmonary RNA. Furthermore, in contrast to the pulmonary RNA-dependent product, the synthesis of this testicular protein was not directed by RNA from testes of immature animals. These findings indicate that a shorter polypeptide chain and pubertal expression--the structural and regulatory properties that distinguish the testicular dipeptidyl carboxypeptidase isozyme--are determined pretranslationally.
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