A novel phospholipase A2/esterase from hyperthermophilic archaeon Aeropyrum pernix K1 |
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Authors: | Wang Baijing Lu Dongmei Gao Renjun Yang Zhen Cao Shugui Feng Yan |
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Affiliation: | Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education, Jilin University, Changchun 130023, PR China. yfeng@mail.jlu.edu.cn |
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Abstract: | An open reading frame of the hyperthermophilic archaeon Aeropyrum pernix K1 APE2325, which composed of 474 bases, was cloned and expressed in Escherichia coli BL21 (DE3) Codon Plus-RIL. The recombinant protein was purified by Ni-chelation affinity chromatography. It showed a single band with a molecular mass of 18kDa in SDS-PAGE. The purified enzyme exhibited both phospholipase A(2) and esterase activities with the optimal catalytic temperature at 90 degrees C. The enzyme activity was Ca(2+)-independent. Kinetic analysis revealed its Km, k cat, and Vm for the p-nitrophenyl propionate substrate were 103microM, 39s(-1), and 249micromol/min/mg, respectively. The recombinant protein was thermostable and its half-life at 100 degrees C was about 1h. |
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Keywords: | Aeropyrum pernix K1 Phospholipase A2 Esterase Thermostability |
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