Buffered non-fermenter system for lab-scale production of secreted recombinant His-tagged proteins in Saccharomyces cerevisiae

Ngamkitidechakul, C.; Twining, S.S.

Biotechniques 33(6): 1296-1300

2002


ISSN/ISBN: 0736-6205
PMID: 12503315
Document Number: 544746
Expression of recombinant proteins using a secretion system can minimize co-purification of contaminating host proteins. Production of His-tagged recombinant proteins in the yeast alpha-factor secretion system has previously required a fermenter system to control the growth conditions such as pH of the yeast culture. We describe an inexpensive non-fermenter system for the production of secreted recombinant His-tagged proteins in Saccharomyces cerevisiae that uses a buffered low peptone YP glycerol medium, which does not interfere with immobilized metal affinity chromatography. Maspin, a tumor suppressor serpin, was expressed as a secreted N-terminal His/FLAG(R)-tagged protein. Purification of the soluble active recombinant protein only requires centrifugation, concentration by ultrafiltration, and Ni2+ affinity chromatography. Purified protein yields of this system are 3-5 mg/L, culture medium.

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