Abstract
In the present study, a system with high lipase expression in Aspergillus oryzae was developed using an improved enolase promoter (P-enoA124) and the 5′ untranslated region of a heat-shock protein (Hsp-UTR). P-enoA142 enhanced the transcriptional level of a heterologous lipase gene and Hsp-UTR improved its translational efficiency. Fusarium heterosporum lipase (FHL) was inserted into a pSENSU-FHL expression vector harboring P-enoA142 and Hsp-UTR and was transformed into an A. oryzae NS4 strain. Transformants possessing pSENSU-FHL in single (pSENSU-FHL#1) and double copies (pSENSU-FHL#2) were selected to evaluate the lipase activity of the whole-cell biocatalyst. The two strains, pSENSU-FHL#1 and #2, showed excellent lipase activity in hydrolysis compared with the strain transformed with conventional expression vector pNAN8142-FHL. Furthermore, by using pSENSU-FHL#2, methanolysis could proceed much more effectively without deactivation, which allowed a swift addition of methanol to the reaction mixture, thereby reducing reaction time.
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This work was partially supported by Regional Innovation Creation R&D Programs, the Ministry of Economy, Trade and Industry (METI), and Special Coordination Funds for Promoting Science and Technology, Creation of Innovation Centers for Advanced Interdisciplinary Research Areas (Innovative Bioproduction Kobe), MEXT, Japan.
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Takaya, T., Koda, R., Adachi, D. et al. Highly efficient biodiesel production by a whole-cell biocatalyst employing a system with high lipase expression in Aspergillus oryzae . Appl Microbiol Biotechnol 90, 1171–1177 (2011). https://doi.org/10.1007/s00253-011-3186-6
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DOI: https://doi.org/10.1007/s00253-011-3186-6