77 results about "Fab Fragments" patented technology

Selective binding agents of interferon-gamma (IFNγ) are provided by the invention. More particularly, the invention provides for antibodies and antigen binding domains which selectively bind to IFNγ and may be used to prevent or treat conditions relating to autoimmune and inflammatory diseases such as rheumatoid arthritis, systemic lupus erythematosus and multiple sclerosis. Nucleic acid molecules encoding said antibodies and antigen binding domains, and expression vectors and host cells for the production of same are also provided.

The present invention relates to nucleic acid sequences and amino acid sequences which influence bone deposition, the Wnt pathway, ocular development, tooth development, and may bind to LRP. The nucleic acid sequence and polypeptides include Wise and Sost as well as a family of molecules which express a cysteine knot polypeptide. Additionally, the present invention relates to various molecular tools derived from the nucleic acids and polypeptides including vectors, transfected host cells, monochronal antibodies, Fab fragments, and methods for impacting the pathways.

The present invention relates to a chromatography ligand, which comprises Domain C from Staphylococcus protein A (SpA), or a functional fragment or variant thereof. The chromatography ligand presents an advantageous capability of withstanding harsh cleaning in place (CIP) conditions, and is capable of binding Fab fragments of antibodies. The ligand may be provided with a terminal coupling group, such as arginine or cysteine, to facilitate its coupling to an insoluble carrier such as beads or a membrane. The invention also relates to a process of using the ligand in isolation of antibodies, and to a purification protocol which may include washing steps and / or regeneration with alkali.

A mutant Fab fragment of the 13B8.2 anti-CD4 antibody that binds a CD4 molecule and includes a mutation of at least one residue in a position situated in the VH variable domain of the heavy chain and / or in a position situated in the Vκ variable domain of the light chain.

The invention provides methods of crystallizing antibodies and fragments thereof as well as crystals produced thereby. More particularly, the invention provides methods of crystallizing human and non-human Fab fragments of antibodies, either alone or as co-crystals with their target ligand. For example, a crystal comprising a murine Fab fragment of the antibody 125-2H or a human Fab fragment of the antibody ABT-325, which bind to IL-18, are provided as well as a co-crystal of a murine Fab fragment bound to IL-18. ABT-325 and 125-2H differ significantly in combining site character and architecture, thus explaining their ability to bind IL-18 simultaneously at distinct epitopes.

Antigen-binding proteins specific for HLA-A2-restricted Wilms tumor 1 peptide are disclosed. The antigen-binding proteins encompass antibodies in a variety of forms, including full-length antibodies, substantially intact antibodies, Fab fragments, F(ab′)2 fragments, and single chain Fv (scFv) fragments, as well as chimeric antigen receptors. Fusion proteins, such as scFv fusions with immunoglobulin or T-cell receptor domains, incorporating the antigen-binding proteins are provided. Methods of using the antigen-binding proteins in the treatment of hyperproliferative diseases such as cancer are also disclosed.

The present invention relates to a chromatography ligand, which comprises Domain C from Staphylococcus protein A (SpA), or a functional fragment or variant thereof. The chromatography ligand presents an advantageous capability of withstanding harsh cleaning in place (CIP) conditions, and is capable of binding Fab fragments of antibodies. The ligand may be provided with a terminal coupling group, such as arginine or cysteine, to facilitate its coupling to an insoluble carrier such as beads or a membrane. The invention also relates to a process of using the ligand in isolation of antibodies, and to a purification protocol which may include washing steps and / or regeneration with alkali.

The present invention relates to glucagon receptor polypeptide antagonists which inhibit the binding of the hormone glucagon to its receptor. More particularly, the present invention relates to high affinity glucagon receptor antibodies or Fab fragments thereof that inhibit binding of glucagon to its receptor and their use in the treatment or prevention of type 2 diabetes (NIDDM) and related disorders in mammalian species.

The present invention relates to glucagon receptor polypeptide antagonists which inhibit the binding of the hormone glucagon to its receptor. More particularly, the present invention relates to high affinity glucagon receptor antibodies or Fab fragments thereof that inhibit binding of glucagon to its receptor and their use in the treatment or prevention of type 2 diabetes (NIDDM) and related disorders in mammalian species.

The invention provides nucleic acid and polypeptide sequences encoding antibody based scaffolds such as full antibodies, antibody Fab fragments, single chain antibodies, soluble VEGF receptor-Fc fusion proteins, and / or anti-angiogenic PDGF receptors. Also encompassed are cell lines encoding such anti-angiogenic antibody scaffolds, VEGF receptors, and / or PDGF receptors. The invention also provides encapsulated cell therapy devices that are capable of delivering such anti-angiogenic antibody scaffolds, VEGF receptors, and / or PDGF receptors as well as methods of using these devices to deliver the anti-angiogenic antibody scaffolds, VEGF receptors, and / or PDGF receptors to medically treat disorders in patients, including ophthalmic, vascular, inflammatory, and cell proliferation diseases.

The present invention relates to particularly stable and soluble scFv antibodies and Fab fragments specific for TNF, which comprise specific light chain and heavy chain sequences that are optimized for stability, solubility, in vitro and in vivo binding of TNF, and low immunogenicity. Said antibodies are designed for the diagnosis and / or treatment of TNF-mediated disorders. The nucleic acids, vectors and host cells for expression of the recombinant antibodies of the invention, methods for isolating them and the use of said antibodies in medicine are also disclosed.

The present invention relates to particularly stable and soluble scFv antibodies and Fab fragments specific for TNFα, which comprise specific light chain and heavy chain sequences that are optimized for stability, solubility, in vitro and in vivo binding of TNFα, and low immunogenicity. Said antibodies are designed for the diagnosis and / or treatment of TNFα-related disorders. The nucleic acids, vectors and host cells for expression of the recombinant antibodies of the invention, methods for isolating them and the use of said antibodies in medicine are also disclosed.

The present invention relates to multispecific, especially bispecific antibodies comprising full length antibodies and single chain Fab fragments, methods for their production, pharmaceutical compositions containing said antibodies, and uses thereof.

The present invention relates to an anticancer drug, an energized fusion protein Anti-CD20(Fab)-LDM of lidamycin, a gene encoding the same; and further relates to a method for construction of the energized fusion protein in a genetic engineering manner and the use of the energized fusion protein. The applicant provides an anti-tumor drug with a good targeting ability by providing the energized fusion protein.

Antigen binding proteins specific for an HLA-A2 restricted Ras peptide are disclosed. The antigen binding proteins encompass antibodies in a variety of forms, including full-length antibodies, substantially intact antibodies, Fab fragments, F(ab′)2 fragments, and single chain Fv fragments. Fusion proteins, such as scFv fusions with immunoglobulin or T-cell receptor domains, and bispecific antibodies incorporating the specificity of the antigen binding region for each peptide are also contemplated by the disclosure. Furthermore, immunoconjugates may include antibodies to which is linked a radioisotope, fluorescent or other detectable marker, cytotoxin, or other molecule are also encompassed by the disclosure. Among other things, immunoconjugates can be used for delivery of an agent to elicit a therapeutic effect or to facilitate an immune effector function.

Human antibody fragments (Fab 14.6.19 and Fab 14.6.20) including polynucleotides and amino acids (SEQ ID NO: 3, SEQ ID NO: 4, SEQ ID NO: 5 and SEQ ID NO: 6) that identify them. Both Fabs are fully human, are affinity matured in vivo, are highly specific for breast cancer, and target an antigen that is immumogenic in vivo. Thus, each Fab may be a useful clinical reagent for diagnosis or therapy of breast cancer and may also lead to the discovery of a novel immunogenic and tumor specific breast cancer antigen.

The inventions provides methods and kits for the dissociation of Fcγ-receptor-IgG complexes, and methods and kits for the isolation of IgG and Fc and Fab fragments of IgG.

Antibody Fab fragments specific for the EGF receptor are disclosed, as are compositions and kits comprising these Fab proteins. The Fab proteins may be conjugated to drugs or other therapeutic agents or to diagnostic agents. Also disclosed are methods for diagnosing and treating diseases such as tumors and cancer in which cells express high levels of the EGFR, using the foregoing Fab molecules and conjugates.

The inventions provides methods and kits for the dissociation of Fcγ-receptor-IgG complexes, and methods and kits for the isolation of IgG and Fc and Fab fragments of IgG.

The present invention provides novel immunolabeling complexes and certain components of such complexes, as well as methods of preparing and using such complexes, and kits for use in preparing labeling proteins and for immunolabeling. The pre-formed immunolabeling complexes of the invention comprise both a target-binding antibody and a labeling protein that contains covalently attached labels, where the labeling protein binds selectively and with high affinity to a selected region of the target-binding antibody. Novel labeling proteins of the invention include non-antibody peptides and proteins, such as a complex of protein G and a labeled albumin, and monovalent antibody fragments, such as labeled Fab fragments of an anti-Fc antibody. In methods of the invention, the preformed immunolabeling complexes are added to the sample alone or in combination, for purposes of labeling and optionally detecting the target of interest.

The invention provides a preparation method for rheumatoid factor detection reagent. The method comprises the following steps of: coupling IgG molecules and latex particles to obtain IgG sensitizing latex; digesting and decomposing obtained IgG sensitizing latex by enzyme to obtain mixture of Fab fragment and Fc fragment sensitizing latex; separating and purifying the Fab fragment and Fc fragmentsensitizing latex to obtain the Fc fragment sensitizing latex; causing the Fc fragment on the sensitizing latex to be denatured, and obtaining the denatured Fc fragment sensitizing latex which is prepared into rheumatoid factor detection reagent. The method not only can produce rheumatoid factor detection reagent with high specificity, but also has low production cost, simple technique and is convenient to large-scale industrialization production.

The present invention relates to tetravalent bispecific antibodies (TetBiAbs), methods of making and methods of using the same for diagnostics and for the treatment of cancer or immune disorders. TetBiAbs feature a second pair of Fab fragments with a second antigen specificity attached to the C-terminus of an antibody, thus providing a molecule that is bivalent for each of the two antigen specificities. The tetravalent antibody is produced by genetic engineering methods, by linking an antibody heavy chain covalently to a Fab light chain, which associates with its cognate, co-expressed Fab heavy chain.

The invention relates to a preparation method of an aflatoxin B1 immunoreaction electrode. The preparation method comprises the following steps: preparing a poly-o-phenylenediamine modified gold electrode, and immobilizing glutaraldehyde on the basis of the electrically-polymerized poly-o-phenylenediamine modified gold electrode; and effectively immobilizing the protein A on the glutaraldehyde, facilitating the Schiff base generation reaction between an amino group of the protein A and the glutaraldehyde, wherein the immobilization quantity and firmness of the protein A on the surface of the electrode can be effectively improved. The AFB1 antibody immobilized on the protein A / glutaraldehyde / poly-o-phenylenediamine / gold electrode can maintain the spatial conformation, so that Fab fragments can orderly stretch out of the surface, the spatial resistance for the combination of the antibody and the antigen can be effectively reduced, the specificity and utilization rate of the antibody can be improved, and the sensitivity of the immunoreactions electrode can be improved. The preparation method is simple, the antibody is reliable and firm to immobilize, the specificity and the utilization rate of the antibody can be greatly improved, the operation is simple, the sensitivity is high, and rapidness in measurement can be realized.

Antibody Fab fragments specific for the EGF receptor are disclosed, as are compositions and kits comprising these Fab proteins. The Fab proteins may be conjugated to drugs or other therapeutic agents or to diagnostic agents. Also disclosed are methods for diagnosing and treating diseases such as tumors and cancer in which cells express high levels of the EGFR, using the foregoing Fab molecules and conjugates.

The present invention discloses novel antibodies that specifically bind to the human platelet membrane protein Glycoprotein VI (GPVI) and their monovalent fragments or derivatives. The antibodies of the invention are antibodies from hybridoma clone 390 and fragment antibodies thereof able to induce a GPVI depletion phenotype. These antibodies and Fab fragments are able to block collagen binding and thus preventing platelet activation by collagen. The invention also relates to hybridoma clones and expression plasmids for the production of disclosed antibodies and Fab fragments. The present invention further refers to the uses of monovalent antibody fragments to manufacture research, diagnostic and immunotherapeutic agents for the treatment of thrombosis and other vascular diseases. The invention also concerns a Fab bearing a molecule at the C-terminal extremity, as well as method for prevention of recognition of Fab by antibodies using such modified Fab. The invention concerns a method for prevention of platelet activation when an anti-GP VI Fab is used.

Improved expression of active antibody fragments (Fabs) is achieved by truncating a heavy chain constant region. Truncation of the CH1 domain of a Fab fragment can increase yield of soluble active antibody fragment in Pseudomonas fluorescens. Another embodiment of the invention includes secretion of the light chain and a fragment of the heavy chain with various C-termini (e.g., VH-CH1 truncated to different lengths). The truncated CH1 region can be used as a scaffold to create other Fabs. Also included is truncation of the kappa light chain and / or lambda light chain domains of a Fab fragment. The invention also includes expression of Fab fragments fused to other peptides or molecules (e.g., toxins, proteins, peptides, enzymes, etc.).

The invention belongs to the technical field of biochemistry, and particularly relates to an antigen detection kit, a preparation method for the antigen detection kit, and an antigen detection method.The antigen detection kit comprises an R1 solution and an R2 solution, wherein the R1 solution comprises a monoclonal antibody containing Fab fragments and Fc fragments, and a biotin-marked monoclonal antibody only containing Fab fragments or a biotin-marked monoclonal antibody that is not homologous to the monoclonal antibody containing the Fab fragments and the Fc fragments; and the R2 solutioncomprises streptavidin magnetic beads, and a secondary antibody marked by a chemiluminescent marker. The antigen detection kit provided by the embodiment of the invention has the advantages that structures of the two monoclonal antibodies in the R1 solution are both undamaged, and magnetic microspheres are dispensed with, so that good antigen and antibody binding effects can be ensured, and the antigen content can be accurately measured with assistance of the R2 solution.