title: Optimized removal of soluble host cell proteins for the recovery of met-human growth hormone inclusion bodies from Escherichia coli cell lysate using crossflow microfiltration.
abstract: Cross-flow membrane microfiltration was used under optimal conditions to recover met-growth hormone inclusion bodies (IBs) from Escherichia coli cell lysate by removal of the host-cell (bacterial) proteins (HCP) under minimal fouling conditions. This is the first step of a two-step process in which the goal was to isolate IBs at high yield from the HCP. These undesired soluble HCP were removed by passing them through the membrane while retaining the insolubles, including the aggregated IBs. Experiments were conducted at constant permeate flux with flat-sheet membranes of different pore sizes and chemistry, with feeds of varying pH and ionic strengths to determine the optimum combination for HCP removal. Diafiltration, the washing away of impurities with protein-free buffer, was then employed to ensure removal of the host cell proteins at the optimum conditions. About 90% removal of the HCP was obtained in about 5 diavolumes, maintaining high protein transmission and low membrane fouling.
authors.affiliation: Howard P. Isermann Department of Chemical and Biological Engineering and Center for Biotechnology and Interdisciplinary Studies, Rensselaer Polytechnic Institute, Troy, New York, USA.
authors.forename: Adith
authors.initials: A
authors.lastname: Venkiteshwaran
authors.forename: Patrick
authors.initials: P
authors.lastname: Heider
authors.forename: Sandro
authors.initials: S
authors.lastname: Matosevic
authors.forename: Are
authors.initials: A
authors.lastname: Bogsnes
authors.forename: Arne
authors.initials: A
authors.lastname: Staby
authors.forename: Susan
authors.initials: S
authors.lastname: Sharfstein
authors.forename: Georges
authors.initials: G
authors.lastname: Belfort
mesh_terms: D004926:Escherichia coli / Q000378:metabolism*; D013006:Growth Hormone / Q000378:metabolism*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D002479:Inclusion Bodies / Q000378:metabolism*; D010446:Peptide Fragments / Q000378:metabolism*; D014462:Ultrafiltration / Q000379:methods
chemical_list: C083032:Met-human growth hormone; D010446:Peptide Fragments; D013006:Growth Hormone