Production and Purification of Human Fibroblast Collagenase (MMP-1) Expressed in the Methylotrophic YeastPichia pastoris |
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Authors: | Stuart A. Rosenfeld O.Harold Ross Milton C. Hillman Jeanne I. Corman Randine L. Dowling |
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Affiliation: | aApplied Biotechnology, Dupont–Merck Pharmaceutical Company, Wilmington, Delaware, 19880;cInflammatory Disease Research, Dupont–Merck Pharmaceutical Company, Wilmington, Delaware, 19880;bProcess Development, Cephalon, Inc. West Chester, Pennsylvania, 19380 |
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Abstract: | The cDNA that encodes the proenzyme form of human fibroblast collagenase (proMMP-1) was expressed in the methylotrophic yeastPichia pastoris.The proMMP-1 encoding DNA was fused to theSaccharomyces cerevisiaepre-pro α-mating factor secretion signal in theP. pastorispPIC9 expression plasmid, transformed into strain GS115 (His−), and His+Muts(slow methanol utilization) transformants were selected. Full-length proenzyme and processed forms of the protein could be detected in yeast culture supernatants following shake flask and 10-liter fermentations. The protein was purified to greater than 95% homogeneity. The recombinant proMMP-1 was comparable to the native fibroblast material based on (i) migration of the full-length molecule as a 52-kDa protein on reducing SDS–PAGE, (ii) correct N-terminal amino acid sequence, (iii) activation of the full-length molecule by 4-amino-phenylmercuric acetate to yield processed protein species, (iv) degradation of gelatin as monitored by zymogram gels, and (v) enzymatic activity. These data suggest that theP. pastorisexpression system offers a convenient and efficient means to produce and purify MMP-1. |
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