1. Isolation of an N-acetyl-DL-phenylalanine beta-naphthyl esterase from rabbit peritoneal polymorphonuclear leukocytes
P Tsung, S W Kegeles, H J Showell, E L Becker Biochim Biophys Acta. 1975 Sep 22;403(1):98-105. doi: 10.1016/0005-2744(75)90012-1.
An N-acetyl-DL-phenylalanine beta-naphthyl esterase has been purified 26-fold from rabbit peritoneal polymorphonuclear leukocytes. The purified enzyme was inhibited by 10(-7) M p-nitrophenylethyl-5-chloropentylphosphonate. The apparent Km for hydrolysis of N-acetyl-DL-phenylalanine beta-naphthyl ester is 71 muM. Optimal reaction rates were observed at pH 6-8. No divalent cation requirement for the activation of the enzyme activity was observed. The esterase activity was neither inhibited nor stimulated by bacterial factor, complement component C5a, guanosine 3',5'-monophosphate (cyclic GMP) and adenosine 3',5'-monophosphate (cyclic AMP) which are attractants or repellents for polymorphonuclear leukocytes. High chemotactic activity was observed in the partially purified fraction of the enzyme. The chemotactic activity, like the enzyme activity, was completely inhibited by 10(-7) M phosphonate.
2. Hydrolyses of alpha-naphthyl acetate, beta-naphthyl acetate, and acetyl-DL-phenylalanine beta-naphthyl ester
S Kirkeby, D Moe Acta Histochem. 1983;72(2):225-31. doi: 10.1016/s0065-1281(83)80058-0.
Using simultaneous coupling azo dye techniques kidney enzymes active against alpha-naphthyl acetate, beta-naphthyl acetate, and acetyl-DL-phenylalanine beta-naphthyl ester are characterized. The enzymes show identical distribution in the section. The banding patterns in zymograms are the same after incubation with the different substrates. The enzymes might, however, be separated by difference in pH optimum, initial velocity and sensitivity to inhibitors and activators.
3. Proteinase mutants of Saccharomyces cerevisiae
E W Jones Genetics. 1977 Jan;85(1):23-33. doi: 10.1093/genetics/85.1.23.
Fifty-nine mutants with reduced ability to cleave the chymotrypsin substrate N-acetyl-DL-phenylalanine beta-naphthyl ester have been isolated in S. cerevisiae. All have reduced levels of one or more of the three well-characterized proteinases in yeast. All have reduced levels of proteinase C (carboxy-peptidase Y). These mutations define 16 complementation groups.
