Abstract:
Die Erfindung betrifft ein Verfahren zur selektiven Anreicherung von Immunglobulinen oder anderen Proteinen, die eine Fc-Domäne enthalten (Zielprotein), mit den Schritten: e. Bereitstellen einer Lösung, die das Zielprotein enthält; f. Einbringen eines Fc-bindenden Proteins mit genau zwei Bindungsstellen unter Bedingungen, die eine Bindung ermöglichen; g. Abtrennen des Präzipitates von der flüssigen Phase; h. Lösen der Bindung des Zielproteins von dem Fc-bindenden Protein.
Abstract:
Methods of purifying proteins expressed in non-mammalian expression systems in a non-native soluble form directly from cell lysate are disclosed. Methods of purifying proteins expressed in non-mammalian expression systems in a non-native limited solubility form directly from a refold solution are also disclosed. Resin regeneration methods are also provided.
Abstract:
The invention provides methods for a purifying protein of interest from a mixture comprising the protein of interest and one or more contaminants, including host cell DNA and proteins, by precipitation of the contaminants with caprylic acid. Such methods are particularly useful for purifying antibodies from cell cultures. Moreover, mixtures that have been depleted of contaminants using the methods of the invention can be used directly in downstream chromatography applications (e.g., ion exchange chromatography) without any further purification. These methods lead to manufacturing processes with a minimum number of unit operations and reduce the resource requirements, and thus positively influence the cost of goods for therapeutic protein production.
Abstract:
The present invention relates to a bimodal polymer such as a soluble polymer capable of irreversibly binding to insoluble particulates and a subset of soluble impurities and also capable of reversibly binding to one or more desired biomolecules in an unclarified biological material containing stream and the methods of using such a material to purify one or more desired biomolecules from such a stream without the need for prior clarification. Such a polymer comprises domains of charged pendant groups such as primary, secondary, tertiary or quaternary amines, (first mode) and is rendered insoluble and precipitates out of solution simply upon complexing with oppositely charged solid particulates and a fraction of the soluble impurities in an amount sufficient to form an aggregate that can no longer be held in solution. The polymer further comprises other domains of pendant groups that are charged or uncharged, hydrophilic or hydrophobic or have a ligand that is selective for the biomolecule of interest depending on the process conditions such as pH, ionic strength, salts, and the like (second mode). When present in one mode, such as the uncharged form, said pendant groups are capable of binding to one or more desired biomolecules within the stream (protein, polypeptide, etc) in an unclarified cell broth. The precipitate can then be removed from the stream, such as by being filtered out from the remainder of the stream and the desired biomolecule is recovered such as by selective elution.
Abstract:
The present invention relates to a selectively soluble polymer capable of binding to a desired molecules in an unclarified mixture containing various biological materials and the methods of using such a polymer to purify a molecule from such a mixture. The polymer is soluble in the mixture under a certain set of process conditions such as pH or temperature and/or salt concentration and is rendered insoluble and precipitates out of solution upon a change in the process conditions. The polymer is capable of binding to the desired molecule (protein, polypeptide, etc) and remains capable of binding to that molecule even after the polymer is precipitated out of solution. The precipitate can then be filtered out from the remainder of the stream and the desired biomolecule is recovered such as by elution and further processed.
Abstract:
The invention provides methods and materials for producing and purifying soluble targets, such as recombinant proteins, from a sample. The invention employs "tags" which can be appended to the target. By addition of a tag-binding entity (or "ligand", the terms are used interchangeably) to the tagged target, the solubility of the target can be reduced and it can be selectively precipitated. Preferred tags are metal binding peptide tags (which may share homology with Ca2+ binding EGF-like domains) wherein addition of appropriate sparingly soluble metal salts to the tagged target causes precipitation.
Abstract:
The present invention provides methods of making immobilized probes that are specific for prion proteins, methods of using such probes to bind, detect, and remove prion proteins from samples, and kits for practicing the invention. The invention discloses immobilized probes that are locked into a particular, pre-determined configuration and that retain their activity and specificity even when exposed to conditions that would typically alter their activity and specificity.
Abstract:
The present invention provides novel naturally-processed MHC class II antigenic peptides; which originate from interferon-gamma-inducible lysosomal thiol reductase, integrin beta-2, phosphatitylinositol-4,5-bisphosphate 3-kinase, urokinase-type plasminogen activator, immunoglobulin heavy chain V-III region (VH26), DJ-1 protein, apolipoprotein B-100, 26S proteasome non-ATPase regulatory subunit 8, interleukin-1 receptor, fibromodulin, GM-CSF/IL-3/IL-5 receptor, sorting nexin 3, inter-alpha-trypsin inhibitor heavy chain H4, complement C4, complement C3 (alpha-chain), complement C3 (beta-chain), SH3 domain-binding glutamic acid-rich-like protein 3, interleukin-4-induced protein 1, hemopexin, Hsc70-interacting protein,invariant chain (Ii), retinoic acid receptor responder protein 2, fibronectin, cathepsin B, tripeptidyl-peptidase II, legumain, platelet activating factor receptor, poly- alpha-2.8-sialyltransferase, and ras-leated protein Rab-11B. Also provided are these antigenic peptides and the proteins they are derived from as markers for erosive and/or non-erosive RA. Moreover, these antigenic peptides linked to MHC class II molecules, antibodies reactive with said antigenic peptides, nucleic acids encoding said antigenic peptides, and nucleic acid constructs, host cells and methods for expressing said antigenic peptides are provided. The antigenic peptides of the invention can be used as markers in diagnosis of RA and in therapy as anti-RA vaccines.
Abstract:
The present invention is directed generally to recombinant methods for making a desired pegylated protein and pooling of same. These method(s) yield a polypeptide product containing reduced levels of aggregate thereof pooled to provide the desired pegylated isoforms thereof.
Abstract:
The present invention is directed to novel methods for enhancing the ability to separate a species of interest from other different species present in a free solution mixture thereof which takes advantage of interactions that occur between soluble, small molecular weight ligands and the species of interest. The small molecular weight ligands employed in the present invention function to interact with a species of interest in a mixture of different species through either affinity, hydrophobic and/or ionic interactions, thereby altering the molecular weight, hydrodynamic volume and/or isoelectric point of the species of interest and rendering it separable from other component(s) in the mixture.