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Characterization of a pH and detergent-tolerant, cold-adapted type I pullulanase from Exiguobacterium sp. SH3

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Abstract

A pullulanase-encoding gene from psychrotrophic Exiguobacterium sp. SH3 was cloned and expressed in both E. coli and Bacillus subtilis. The functional recombinant enzyme (Pul-SH3) was purified as a His-tagged protein. Pul-SH3 was characterized to be a cold-adapted type I pullulanase with maximum activity at 45 °C. Using fluorescence spectroscopy, the melting temperature of Pul-SH3 was determined to be about 52 °C. The enzyme was able to hydrolyze pullulan, soluble starch, potato starch, and rice flour. It was exceptionally tolerant in the pH range of 4–11, exhibiting maximum activity at pH 8.5 and more than 60 % of the activity in the pH range of 5–11. Being a detergent-tolerant pullulanase, Pul-SH3 retained 99, 89, and 54 % of its activity at 10 % concentration of Triton-X100, Tween 20, and SDS, respectively. The enzyme also exhibited an activity of 80.4 and 93.7 % in the presence of two commercial detergents, Rika (7.5 % v/v) and Fadisheh (2.5 % w/v), respectively. The enzyme was even able to remain active by 54.5 and 85 % after 10-day holding with the commercial detergents. Thermal stability of the enzyme could w on silica. Pul-SH3 with several industrially important characteristics seems desirable for cold hydrolysis of starch.

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Acknowledgments

This work was supported by the Iran National Science Foundation (Grant No. 91004311).

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Correspondence to Hossein Shahbani Zahiri.

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Communicated by L. Huang.

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Rajaei, S., Noghabi, K.A., Sadeghizadeh, M. et al. Characterization of a pH and detergent-tolerant, cold-adapted type I pullulanase from Exiguobacterium sp. SH3. Extremophiles 19, 1145–1155 (2015). https://doi.org/10.1007/s00792-015-0786-6

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  • DOI: https://doi.org/10.1007/s00792-015-0786-6

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