Abstract
A 777-bp cDNA fragment encoding a mature alkaline lipase (LipI) from Penicillium cyclopium PG37 was amplified by RT–PCR, and inserted into the expression plasmid pPIC9 K. The recombinant plasmid, designated as pPIC9 K-lipI, was linearized with SalI and transformed into Pichia pastoris GS115 (his4, Mut+) by electroporation. MD plate and YPD plates containing G418 were used for screening of the multi-copy P. pastoris transformants (His+, Mut+). One transformant resistant to 4.0 mg/ml of G418, numbered as P. pastoris GSL4-7, expressing the highest recombinant LipI (rLipI) activity was chosen for optimizing expression conditions. The integration of the gene LipI into the P. pastoris GS115 genome was confirmed by PCR analysis using 5′- and 3′-AOX1 primers. SDS–PAGE and lipase activity assays demonstrated that the rLipI, a glycosylated protein with an apparent molecular weight of about 31.5 kDa, was extracellularly expressed in P. pastoris. When the P. pastoris GSL4-7 was cultured under the optimized conditions, the expressed rLipI activity was up to 407 U/ml, much higher than that (10.5 U/ml) expressed with standard protocol. The rLipI showed the highest activity at pH 10.5 and 25°C, and was stable at a broad pH range of 7.0–10.5 and at a temperature of 30°C or below.
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Acknowledgment
This work was supported by a grant from the National Natural Science Foundation of China (No. 20776061). We are grateful to Prof. Weida Huang (Department of Biochemistry, School of life Sciences, Fudan University) for providing technical assistance.
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Tan, Z., Li, J., Wu, M. et al. High-level heterologous expression of an alkaline lipase gene from Penicillium cyclopium PG37 in Pichia pastoris . World J Microbiol Biotechnol 27, 2767–2774 (2011). https://doi.org/10.1007/s11274-011-0752-0
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DOI: https://doi.org/10.1007/s11274-011-0752-0