Journal
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
Volume 82, Issue 3, Pages 463-470Publisher
SPRINGER
DOI: 10.1007/s00253-008-1774-x
Keywords
Aquaporin Z; MBP; GST; DsbA; Membrane protein
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Funding
- The National Natural Science Foundation of China [20736008, 20676115]
- The Ministry of Science and Technology [2007AA021702]
- The Ministry of Education
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Aquaporin Z (AqpZ), a typical orthodox aquaporin with six transmembrane domains, was expressed as a fusion protein with TrxA in E. coli in our previous work. In the present study, three fusion partners (DsbA, GST and MBP) were employed to improve the expression level of this channel protein in E. coli. The result showed that, compared with the expression level of TrxA-AqpZ, five- to 40-fold increase in the productivity of AqpZ with fusion proteins was achieved by employing these different fusion partners, and MBP was the most efficient fusion partner to increase the expression level. By using E. coli C43 (DE3)/pMAL-AqpZ, the effects of different expression conditions were investigated systematically to improve the expression level of MBP-AqpZ in E. coli. The high productivity of MBP-AqpZ (200 mg/l) was achieved under optimized conditions. The present work provides a novel approach to improve the expression level of membrane proteins in E. coli.
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