Abstract
Alpha amylase (E.C. 3.2.1.1) of Bacillus amyloliquefaciens produced by submerged fermentation was purified to near homogeneity by ion exchange chromatography. Through the process 38.6-fold increase in purity with a specific activity of 72 U/mg proteins was obtained. The apparent molecular weight of the purified enzyme was found to be 58 kDa by SDS-PAGE. The enzyme was relatively stable between pH 5.0–8.0 and temperature between 50 and 60°C. The enzyme did not show any obligate requirement of metal ions but Ca2+ and Cu2+ enhanced the enzyme activity marginally and the thermostability was enhanced in the presence of Ca2+ ions. The purified enzyme exhibited maximal substrate specificity for amylose and efficiency in digesting various raw starches. The K m and V max of the enzyme was determined using both amylose and soluble starch as substrate. The analysis of the hydrolyzed products of soluble starch by thin layer chromatography showed the yield of maltosaccharides after 6 h of hydrolysis.
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Bordbar, A. K., Omidiyan, K., & Hosseinzadeh, R. (2005). Colloids and Surfaces. B, Biointerfaces, 40, 67–71. doi:10.1016/j.colsurfb.2004.10.002.
Pandey, A., Soccol, C. R., Nigam, P., Soccol, V. T., Vandenbergh, L., & Mohan, R. (2000). Bioresource Technology, 74, 81–87. doi:10.1016/S0960-8524(99)00143-1.
Gangadharan, D., Sivaramakrishnan, S., Nampoothiri, K. M., & Pandey, A. (2006). Food Technology and Biotechnology, 44(2), 269–274.
Gangadharan, D., Sivaramakrishnan, S., Nampoothiri, K. M., Sukumaram, R. K., & Pandey, A. (2008). Bioresource Technology, 99(11), 4597–4602. doi:10.1016/j.biortech.2007.07.028.
Sivaramakrishnan, S., Gangadharan, D., Nampoothiri, K. M., & Pandey, A. (2006). Food Technology and Biotechnology, 44(2), 173–184.
Mamo, G., & Gessesse, A. (1999). Enzyme and Microbial Technology, 25, 433–438. doi:10.1016/S0141-0229(99)00068-X.
Hamilton, L. M., Kelly, C. T., & Fogarty, W. M. (1998). Carbohydrate Research, 314, 251–257. doi:10.1016/S0008-6215(98)00300-0.
Hayashida, S., Teramoto, Y., Inoue, T., & Mitsuiki, S. (1990). Applied and Environmental Microbiology, 56(1), 2584–2586.
Hamilton, L. M., Kelly, C. T., & Fogarty, W. M. (1999). Biotechnology Letters, 21, 111–115. doi:10.1023/A:1005413816101.
Freer, S. N. (1993). Applied and Environmental Microbiology, 59, 1398–1402.
Okolo, B. N., Ezeogu, L. I., & Mba, C. N. (1995). Journal of the Science of Food and Agriculture, 69, 109–115. doi:10.1002/jsfa.2740690117.
Miller, G. L. (1959). Analytical Chemistry, 31, 426–429. doi:10.1021/ac60147a030.
Lowry, O. H., Rosebrough, N. J., Farr, A. L., & Randall, R. J. (1951). The Journal of Biological Chemistry, 193, 263–275.
Laemmli, U. K. (1970). Nature, 227, 680–685. doi:10.1038/227680a0.
Lineweaver, H., & Burk, D. (1934). Journal of the American Chemical Society, 56, 658–666. doi:10.1021/ja01318a036.
Anderson, K., Li, S., & Li, Y. (2000). Analytical Biochemistry, 287, 337–339. doi:10.1006/abio.2000.4829.
Liu, X. D., & Xu, Y. (2008). Bioresource Technology, 99(10), 4315–4320. doi:10.1016/j.biortech.2007.08.040.
Collins, B. S., Kelly, C. T., Fogarty, W. M., & Doyle, E. M. (1993). Applied Microbiology and Biotechnology, 39, 31–35.
Morgan, F. J., & Priest, F. G. (1981). The Journal of Applied Bacteriology, 50, 107–114.
Vihinen, M., & Mantsala, P. (1989). Critical Reviews in Biochemistry and Molecular Biology, 24, 409–418. doi:10.3109/10409238909082556.
Coronado, M. J., Vargas, C., Hofemeister, J., Ventosa, A., & Nieto, J. J. (2000). FEMS Microbiology Letters, 83, 67–71.
Tanaka, A., & Hoshino, E. (2002). The Biochemical Journal, 364, 635–639. doi:10.1042/BJ20011436.
Aguilar, G., Guyot, J. M., Aguilar, B. T., & Guyot, J. P. (2000). Enzyme and Microbial Technology, 27, 406–413. doi:10.1016/S0141-0229(00)00230-1.
Goyal, N., Gupta, J. K., & Soni, S. K. (2005). Enzyme and Microbial Technology, 37, 723–734. doi:10.1016/j.enzmictec.2005.04.017.
Das, K., Doley, R., & Mukherjee, K. M. (2004). Biotechnology and Applied Biochemistry, 40, 291–298. doi:10.1042/BA20040034.
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The study was financially supported by Department of Biotechnology, New Delhi.
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Gangadharan, D., Nampoothiri, K.M., Sivaramakrishnan, S. et al. Biochemical Characterization of Raw-starch-digesting Alpha Amylase Purified from Bacillus amyloliquefaciens . Appl Biochem Biotechnol 158, 653–662 (2009). https://doi.org/10.1007/s12010-008-8347-4
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DOI: https://doi.org/10.1007/s12010-008-8347-4