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• W2000739775 endingPage "150" @default.
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• W2000739775 abstract "Extraction systems for hydrophobically tagged proteins have been developed based on phase separation in aqueous solutions of non-ionic detergents and polymers. The systems have earlier only been applied for separation of membrane proteins. Here, we examine the partitioning and purification of the amphiphilic fusion protein endoglucanase I(core)-hydrophobin I (EGI(core)-HFBI) from culture filtrate originating from a Trichoderma reesei fermentation. The micelle extraction system was formed by mixing the non-ionic detergent Triton X-114 or Triton X-100 with the hydroxypropyl starch polymer, Reppal PES100. The detergent/polymer aqueous two-phase systems resulted in both better separation characteristics and increased robustness compared to cloud point extraction in a Triton X-114/water system. Separation and robustness were characterized for the parameters: temperature, protein and salt additions. In the Triton X-114/Reppal PES100 detergent/polymer system EGI(core)-HFBI strongly partitioned into the micelle-rich phase with a partition coefficient (K) of 15 and was separated from hydrophilic proteins, which preferably partitioned to the polymer phase. After the primary recovery step, EGI(core)-HFBI was quantitatively back-extracted (K(EGIcore-HFBI)=150, yield=99%) into a water phase. In this second step, ethylene oxide-propylene oxide (EOPO) copolymers were added to the micelle-rich phase and temperature-induced phase separation at 55 degrees C was performed. Total recovery of EGI(core)-HFBI after the two separation steps was 90% with a volume reduction of six times. For thermolabile proteins, the back-extraction temperature could be decreased to room temperature by using a hydrophobically modified EOPO copolymer, with slightly lower yield. The addition of thermoseparating co-polymer is a novel approach to remove detergent and effectively releases the fusion protein EGI(core)-HFBI into a water phase." @default.
• W2000739775 created "2016-06-24" @default.
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• W2000739775 date "2002-01-01" @default.
• W2000739775 modified "2023-09-27" @default.
• W2000739775 title "A novel two-step extraction method with detergent/polymer systems for primary recovery of the fusion protein endoglucanase I–hydrophobin I" @default.
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• W2000739775 doi "https://doi.org/10.1016/s0304-4165(01)00244-6" @default.
• W2000739775 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11853968" @default.
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