Expression of proteins containing disulfide bonds in an insect cell-free system and confirmation of their arrangements by MALDI-TOF MS |
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Authors: | Ezure Toru Suzuki Takashi Shikata Masamitsu Ito Masaaki Ando Eiji Nishimura Osamu Tsunasawa Susumu |
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Institution: | Life Science Laboratory, Analytical and Measuring Instruments Division, Shimadzu Corporation, Kyoto, Japan. |
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Abstract: | Escherichia coli alkaline phosphatase (AP) and human lysozyme (h-LYZ), which contain two and four disulfide bonds, respectively, were expressed in a cell-free protein synthesis system constructed from Spodoptera frugiperda 21 (Sf21) cells. AP was expressed in a soluble and active form using the insect cell-free system under non-reducing conditions, and h-LYZ was expressed in a soluble and active form under non-reducing conditions after addition of reduced glutathione (GSH), oxidized glutathione (GSSG), and protein disulfide isomerase (PDI). The in vitro synthesized proteins were purified by means of a Strep-tag attached to their C termini. Approximately 41 microg AP and 30 microg h-LYZ were obtained from 1 mL each of the reaction mixture. The efficiency of protein synthesis approached that measured under reducing conditions. Analysis of the disulfide bond arrangements by MALDI-TOF MS showed that disulfide linkages identical to those observed in the wild-type proteins were formed. |
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Keywords: | Cell‐free protein synthesis system Disulfide bond Insect cell MALDI‐TOF MS |
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