Inventors:
Stuart Builder - Belmont CA
Roger Hart - Burlingame CA
Philip Lester - San Lorenzo CA
John Ogez - Redwood City CA
David Reifsnyder - San Mateo CA
Assignee:
Genentech, Inc. - South San Francisco CA
International Classification:
C07K 120
C07K 1465
C07K 1461
C12N 100
Abstract:
A method is described for isolating an exogenous polypeptide in a non-native conformation from cells, such as an aqueous fermentation broth, in which it is prepared comprising contacting the polypeptide with a chaotropic agent and preferably a reducing agent and with phase-forming species to form multiple aqueous phases, with one of the phases being enriched in the polypeptide and depleted in the biomass solids and nucleic acids originating from the cells. Preferably, the method results in two aqueous phases, with the upper phase being enriched in the polypeptide.