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Molecules 2014, 19(9), 14396-14405;

Identification, Characterization, and Immobilization of an Organic Solvent-Stable Alkaline Hydrolase (PA27) from Pseudomonas aeruginosa MH38

Department of Applied Chemistry and Biological Engineering, College of Engineering, Ajou University, Suwon 443-749, Korea
Author to whom correspondence should be addressed.
Received: 19 May 2014 / Revised: 29 July 2014 / Accepted: 14 August 2014 / Published: 12 September 2014
(This article belongs to the Section Organic Chemistry)
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An organic solvent-stable alkaline hydrolase (PA27) from Pseudomonas aeruginosa MH38 was expressed, characterized, and immobilized for biotechnological applications. Recombinant PA27 was expressed in Escherichia coli as a 27 kDa soluble protein and was purified by standard procedures. PA27 was found to be stable at pH 8–11 and below 50 °C. It maintained more than 80% of its activity under alkaline conditions (pH 8.0–11.0). Furthermore, PA27 exhibited remarkable stability in benzene and n-hexane at concentrations of 30% and 50%. Based on these properties, immobilization of PA27 for biotechnological applications was explored. Scanning electron microscopy revealed a very smooth spherical structure with numerous large pores. Interestingly, immobilized PA27 displayed improved thermal/chemical stabilities and high reusability. Specifically, immobilized PA27 has improved thermal stability, maintaining over 90% of initial activity after 1 h of incubation at 80 °C, whereas free PA27 had only 35% residual activity. Furthermore, immobilized PA27 showed higher residual activity than the free enzyme biocatalysts against detergents, urea, and phenol. Immobilized PA27 could be recycled 20 times with retention of ~60% of its initial activity. Furthermore, macroscopic hydrogel formation of PA27 was also investigated. These characteristics make PA27 a great candidate for an industrial biocatalyst with potential applications. View Full-Text
Keywords: PA27; hydrolase; immobilization; stability; electron microscopy PA27; hydrolase; immobilization; stability; electron microscopy

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Jang, E.; Ryu, B.H.; Kim, T.D. Identification, Characterization, and Immobilization of an Organic Solvent-Stable Alkaline Hydrolase (PA27) from Pseudomonas aeruginosa MH38. Molecules 2014, 19, 14396-14405.

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