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• W2022890876 abstract "The new aspect concerning the applicability of histidine and other affinity tags for the purification of oligomeric proteins, with particular emphasis on cleavage efficiency and final yield, is presented in this study. The final yield depends on both the cleavage efficiency and the degree of oligomerization of the protein. Cleavage procedures that are good enough for monomeric proteins can be problematic for oligomeric proteins. Random distribution of uncleaved or partially cleaved affinity tags among oligomers is the main cause of reduced yields. A trimeric protein, tumour necrosis factor alpha (TNF-alpha), bearing different histidine tags, was used as a model protein to explore and confirm this theoretical concept. Analysis of mixed TNF trimers, prepared from tag-free TNF doped with various amounts of histidine-tagged TNF, revealed an increased retention of the trimeric protein on immobilized metal-ion affinity chromatography (IMAC) columns. When 20% of histidine-tagged TNF was added, more than 50% of the protein was retained on the IMAC column. Thus, the applicability of histidine- and other affinity tags for purifying oligomeric proteins is significantly prejudiced in the case of higher oligomers. Various histidine-tags were fused to the N-terminus of full-length TNF-alpha and to the truncated form (dN6) of TNF-alpha. Two-step IMAC separation was used for purification. In the first step, IMAC-1, over 95% purity of histidine-tagged protein was achieved in all cases. Endo- and exoproteolytic removal of histidine tags with enterokinase (EKmax) and aminodipeptidase (DAPase) was studied and the major parameters affecting cleavage efficiency, microheterogeneity and final yield are critically discussed. IMAC-2 was used as the second and final step for removing the cleavage enzyme, cleaved tags, unprocessed protein and some other impurities. Selection of the optimal cleavage enzyme depends on the amino acid composition of the N-terminus and the intended use of the purified protein. The main conclusion is that special caution should be taken when introducing affinity tags to oligomeric proteins, with the final goal to produce pure, tag-free protein with acceptable yields. Given the same enzyme cleavage efficiency one can expect progressively reduced final protein yields with increasing degree of oligomerization. This should be considered as a general rule." @default.
• W2022890876 created "2016-06-24" @default.
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• W2022890876 date "2006-01-01" @default.
• W2022890876 modified "2023-10-17" @default.
• W2022890876 title "Influence of the protein oligomericity on final yield after affinity tag removal in purification of recombinant proteins" @default.
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• W2022890876 doi "https://doi.org/10.1016/j.chroma.2005.09.089" @default.
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