Abstract
The author of this article and colleagues earlier reported the role played by rhizosphere bacterial antagonists, Bacillus subtilis PFMRI and Paenibacillus macerans PF9, as bioprotectant and plant growth-promoting rhizobacteria (PGPRB). Since the strains were isolated from the rhizosphere, a diverse and complex environment, it was hypothesized that the strains that are able to survive in such competitive environment could be of potential source of multiple hydrolytic enzymes with ability to biodegrade macromolecules as well. Accordingly, a number of hydrolytic enzymes of the two strains were extracted using carboxymethyl cellulose (CMC), pectin, starch and birchwood xylan as substrates and comparatively analysed for their respective catalytic activities and enzyme kinetics. Consequently, a number of hydrolytic enzymes, namely, cellulase, pectinase, xylanase and amylase, with important physiochemical properties were extracted from B. subtilis PFMRI and P. macerans PF9. Accordingly, the optimal pH and temperature of enzymes from the former strain were found to vary from 5.0 to 9.0 and 50oC to 65oC, while for the ones from the latter, strain varied from 5.5 to 9.0 and 40oC to 55oC, respectively, whereas the maximum velocity (Vmax), the amount substrate needed to reach half Vmax (Km) and the time needed to reach half Vmax under optimal condition (Km t) for enzymes from the former strain varied from 1128.64 to 13241.86 μmol.min−1.L−1, 1.81 to 205.1 mM and 0.19 to 8.04 min, while for the ones from the latter strain, values varied from 3565.10 to 15366.68 μmol.min−1.L−1, 6.1 to 114.6 mM and 1.54 to 2.86 min, respectively. The present study is the first of its kind in reporting the bioprospecting of multiple hydrolytic enzymes from bacterial antagonists for biodegradation of macromolecules. Accordingly, a number of hydrolytic enzymes stable at elevated temperatures and pH extremes as well as with higher catalytic dynamics and substrate affinity were identified. Besides, it is anticipated that the new parameter, Km t, would help us know the time limit of an enzymatic reaction and manipulate the reaction as needed. Thus, such enzymes would be of potential role in the white industry. Yet, further study should be conducted to reverse engineer and work on heterologous expression of such enzymes so as to manipulate them for improved physiochemical as well as kinetic traits.
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Feto, N.A., Motloi, T. (2016). Bioprospecting of Multiple Hydrolytic Enzymes from Antagonistic Bacillus spp. for Biodegradation of Macromolecules. In: Islam, M., Rahman, M., Pandey, P., Jha, C., Aeron, A. (eds) Bacilli and Agrobiotechnology. Springer, Cham. https://doi.org/10.1007/978-3-319-44409-3_14
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