Evolution of phosphagen kinase (III). Amino acid sequence of arginine kinase from the shrimp Penaeus japonicus.

The amino acid sequence of arginine kinase (AK) from the shrimp Penaeus japonicus has been determined chemically. It consists of 355 amino acid residues, and has a calculated molecular mass of 40,018 Da. The amino acid sequence of Penaeus AK showed 91% and 51% identity, respectively, with those of AKs from the lobster Homarus vulgaris and the abalone Nordotis madaka. It also showed significant homology (39-43%) with vertebrate or invertebrate creatine kinases and annelid glycocyamine kinase, suggesting that these enzymes evolved from a common origin.