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• W2118854541 abstract "In this study, integration of three discrete process aspects of the IMAC purification of Escherichia coli expressed recombinant proteins has been investigated. To this end, novel N-terminally tagged human growth hormone variants (tagged-vhGHs) have been expressed in E. coli by tank fermentation and captured directly from the cell lysate by a new IMAC approach. The chelating ligands used were 1,4,7-triaza-cyclononane (tacn) and bis(1,4,7-triazacyclononyl)-propane (dtnp) with copper(II) as the immobilised metal ion. The N-terminal tags were specifically selected for their potential to bind to these immobilised complexes and also for their ease of removal from the tagged protein by the dipeptidyl peptidase, DAP-1. Low levels of detergents in the binding buffer did not dramatically affect the purification, but increased concentrations of NaCl in the loading buffer improved the binding performance. The same IMAC systems, operated in the ‘negative’ adsorption chromatographic mode, could be used to obtain the purified mature human growth hormone variant, as assessed by MALDI-TOF and N-terminal sequencing studies, following removal of the affinity tag by the dipeptidyl peptidase 1. Western immunoblot analysis of the eluted fractions of both the tagged and de-tagged vhGH demonstrated significant clearance of E. coli host cell proteins (HCPs). Further, these IMAC resins can be used multiple times without the need for metal ion re-charging between runs. This study thus documents an integrated approach for the purification of specifically tagged recombinant proteins expressed in genetically modified E. coli." @default.
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• W2118854541 date "2014-02-01" @default.
• W2118854541 modified "2023-10-16" @default.
• W2118854541 title "Purification of a recombinant human growth hormone by an integrated IMAC procedure" @default.
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• W2118854541 doi "https://doi.org/10.1016/j.pep.2013.11.002" @default.
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