Abstract
Polyphenol oxidase (EC 1.14.18.1) was purified from the pupae of blowfly (Sarcophaga bullata) by a procedure involving ammonium sulfate fractionation and chromatography on DEAE-cellulose and Sephadex G-100. Kinetic characteristics of the enzyme were determined using L-DOPA as substrate. The specific activity of the enzyme was 770 U/mg, and the Michaelis constant (K m) was 1.5 ± 0.1 mM (pH 6.8, 30°C). Activity was maximal at 40°C, pH 6.5. Chemical modification experiments demonstrated that cysteine and tryptophan residues are essential and arginine residues are not essential to the enzyme function. The enzyme is inhibited by quercetin with an IC50 of 0.20 ± 0.06 mM. The inhibition is of competitive type, and the inhibition constant was determined to be 88 μM.
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REFERENCES
Chen, Q. X., Liu, X. D., and Huang, H. (2003) Biochemistry (Moscow), 68, 644–649.
Fujimoto, K., Masuda, K. I., Asada, N., and Ohnishi, E. (1993) J. Biochem., 113, 285–291.
Funatsu, M., and Inaba, T. (1962) Agric. Biol. Chem., 26, 535–540.
Inaba, T., and Funatsu, M. (1964) Agric. Biol. Chem., 28, 206–215.
Yamaura, I., Yonekura, M., Katsura, Y., Ishiguro, M., and Funatsu, M. (1980) Agric. Biol. Chem., 44, 55–59.
Hara, T., Tsukamoto, T., Maruta, K., and Funatsu, M. (1989) Agric. Biol. Chem., 53, 1387–1393.
Chase, M. R., Raina, K., Bruno, J., and Sugumaran, M. (2000) Insect Biochem. Mol. Biol., 30, 953–967.
Hall, M., Scott, T., Sugumaran, M., Soderhall, K., and Law, J. H. (1995) Proc. Natl. Acad. Sci. USA, 92, 7764–7768.
Jimenez, M., Chazarra, S., Escribano, J., Cabanes, J., and Garcia-Carmina, F. (2001) J. Agric. Food Chem., 49, 4060–4063.
Zhou, X. W., Chen, Q. X., Chen, Z., He, Z. Q., and Zhou, H. M. (2000) Biochemistry (Moscow), 65, 1424–1428.
Chen, Q. X., Zheng, W. Z., Lin, J. Y., Cai, Z. T., and Zhou, H. M. (2000) Biochemistry (Moscow), 65, 1105–1110.
Simpson, K., Marshall, R., and Otwell, W. (1987) J. Agric. Food Chem., 35, 918–921.
Vamos-Vigyazo, C. L. (1981) Crit. Rev. Food Sci. Nutr., 15, 49–127.
Zhao, J., Qi, X. Y., You, Y. M., Wang, J. X., and Zhou, P. G. (1997) J. Shanghai Fish. Univ., 6, 157–165.
Gergel, D., and Cederbaum, A. I. (1997) Arch. Biochem. Biophys., 347, 282–288.
Chen, Q. X., Zhang, W., Zheng, W. Z., Zhao, H., Yan, S. X., Wang, H. R., and Zhou, H. M. (1996) J. Protein Chem., 15, 345–350.
Gartner, E. M., Liebold, K., Legrum, B., Fasold, H., and Passow, H. (1997) Biochim. Biophys. Acta, 1323, 208–222.
Xie, W. Z., Wang, H. R., Chen, Q. X., and Zhou, H. M. (1996) Biochem. Mol. Biol. Int., 40, 981–991.
Xie, L. P., Chen, Q. X., Huang, H., and Zhang, R. Q. (2003) Biochemistry (Moscow), 68, 487–491.
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Wang, Q., Chen, QX., Huang, XH. et al. Enzymatic Characterization and Functional Groups of Polyphenol Oxidase from the Pupae of Blowfly (Sarcophaga bullata). Biochemistry (Moscow) 69, 918–920 (2004). https://doi.org/10.1023/B:BIRY.0000040225.33267.26
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DOI: https://doi.org/10.1023/B:BIRY.0000040225.33267.26