A cDNA clone for porcine liver proline-beta-naphthylamidase was isolated and sequenced. The deduced amino acid sequence of 567 residues was highly homologous with those of carboxylesterases (EC 3.1.1.1) previously reported for other species. In addition, proline-beta-naphthylamidase purified from porcine liver was shown to have strong activity towards p-nitrophenylacetate, a representative substrate for carboxylesterases. These results suggest that proline-beta-naphthylamidase is identical with carboxylesterase.
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Matsushima et al. (1991) studied this question.
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