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The primary structure of pancreatic ribonuclease from langur (Presbytis entellus) has been determined. This sequence differs from that of human pancreatic ribonuclease at 14 (11%) of the amino acid positions. Eight of these 14 differences involve changes of charge, with the langur enzyme having five fewer positive charges than the human enzyme. The difference in charge between human and langur ribonuclease may be an adaptation to the different requirements for a nondigestive and a digestive role, respectively. A number of similarities in expression, gene duplications, and properties between mammalian ribonucleases and lysozymes have been observed, indicating similar adaptations in both enzyme systems.

The primary structure of langur (Presbytis entellus) pancreatic ribonuclease: adaptive features in digestive enzymes in mammals.