100 results about "Affinity Reagent" patented technology

A bispecific antibody format providing ease of isolation is provided, comprising immunoglobulin heavy chain variable domains that are differentially modified in the CH3 domain, wherein the differential modifications are non-immunogenic or substantially non-immunogenic with respect to the CH3 modifications, and at least one of the modifications results in a differential affinity for the bispecific antibody for an affinity reagent such as Protein A, and the bispecific antibody is isolable from a disrupted cell, from medium, or from a mixture of antibodies based on its affinity for Protein A.

This invention relates generally to a mass spectrometer probe and a method of using said probe for desorption and ionization of analytes. The sample probe comprises an affinity reagent on the probe surface, wherein the affinity reagent is capable of selectively binding an analyte. An analyte bound to the affinity reagent can be desorbed by a high energy source and detected in the mass spectrometer. The probe and methods are useful in detection and analysis of macromolecules such as proteins or other biomolecules.

A flow-through assay device capable of detecting the presence or quantity of an analyte of interest is provided that is accurate, reliable, and easy-to-use. The device contains a substrate printed with a channel to facilitate the flow of a test sample to a detection working electrode. The detection working electrode communicates with affinity reagents, such as redox mediators and capture ligands. For instance, capture ligands that are specific binding members for the analyte of interest are applied to the detection electrode to serve as the primary location for detection of the analyte.

Affinity separation compositions and methods are disclosed for separating targets from complex mixtures. Affinity reagents are bound to a solid support oriented in a manner to facilitate the activity of the affinity reagents which are capable of binding specific targets by affinity recognition. Affinity reagents include IgY antibodies, proteins, peptides, nucleotides and polymers. Targets include proteins, protein-protein complexes, protein-nucleotide complexes, nucleotides, cells and subcellular organelles.

Methods and compositions are disclosed for introducing molecular switch functionality into a protein affinity reagent to render its binding to a target molecule sensitive to an environmental trigger, such as pH, while maintaining binding affinity to the target molecule. Combinatorial libraries created by the method are also disclosed.

Methods and kits for the quantitation of cellular DNA and cell numbers are provided. Passive element uptake, element-labeled DNA intercalators, and element labeled affinity reagents are used to quantify DNA and cells. The DNA and the cells are analyzed by elemental analysis, including ICP-MS. The methods and kits provide a fast and accurate analysis of cellular DNA and cell numbers.

Some aspects of this invention provide reagents and methods for the sensitive, quantitative and simultaneous detection of target analytes in complex biological samples by liquid chromatography tandem mass spectrometry (LC MS/MS). Some aspects of this invention provide affinity reagents encoded with mass reporters for the sensitive and quantitative translation of an analyte of interest into a mass tag. The reagents and methods provided herein have general utility in analyte detection and encoding, for example, in biomolecular profiling, molecular diagnostics, and biochemical encoding.

This invention provides methods and compositions for capturing circulating tumor cells (CTCs) as well as various divergent CTC phenotypes using seprase-specific affinity reagents. Methods of analyzing CTCs and assessing their metastatic potential in vivo and in vitro are also disclosed.

The invention provides heterodimer bispecific antigen-binding molecules that include a first polypeptide that does not include an IgG CH1 domain and a second polypeptide having an immunoglobulin constant region where there is at least one mutation in the IgG CH3 domain that abolishes the ability of the second polypeptide to bind CH3-specific affinity media such that the first and second polypeptides have different affinities with respect to CH1 and CH3 specific affinity reagents that allows rapid isolation by differential binding of the first and second polypeptides to these affinity reagents. The invention also provides bispecific antibodies that have IgG CH1 and CH3 regions with different affinities with respect to affinity reagents that allows rapid isolation by differential binding of the IgG regions to these affinity reagents. The invention also concerns bispecific antibodies which are heterodimers of heavy chains, i.e., two immunoglobulin heavy chains that differ by at least two amino acids that allow for the isolation of the bispecific antibody based on a differential affinity of one mutated immunoglobulin heavy chain and a second mutated immunoglobulin heavy chain toward two different affinity reagents.

This invention relates to the use of protein scaffolds for producing affinity reagents that are polypeptides that specifically bind to phosphopeptides.

The invention provides compositions and methods for sequencing nucleic acids and other applications. In sequencing by synthesis, unlabeled reversible terminators are incorporated by a polymerase in each cycle, then labeled after incorporation by binding to the reversible terminator a directly or indirectly labeled antibody or other affinity reagent.

The present invention relates to the field of cancer. More specifically, the present invention provides methods and compositions useful for diagnosing or predicting cancer in a patient. In one embodiment, a method for identifying a patient as having cancer comprises the steps of (a) providing a formalin-fixed, paraffin-embedded or fresh frozen sample of patient tissue; (b) steaming the sample in antigen retrieval buffer; (c) incubating the sample in hydrochloric acid (HCl); (d) incubating the sample with an affinity reagent specific for 5hmC under conditions to form a complex between the affinity reagent and 5-hydroxymethylcytosine (5hmC) present in the sample; (e) detecting the complexes formed between 5hmC and the affinity reagent with secondary detection reagents; (f) quantifying 5hmC levels; and (g) identifying the patient as having cancer if the 5hmC levels in the sample are reduced as compared to a control.

Methods for screening of affinity reagents for many target proteins of interest simultaneously. Arrayed targets (e.g., peptide, protein, RNA, cell, etc.) are used in affinity selection experiments to reduce the amount of target needed and to improve the throughput of discovering recombinant affinity reagents to a large collection of targets.

Noroviruses are recognized as the most common cause of outbreaks of acute gastroenteritis in humans. Therefore, the present invention relates to peptides or dendrimers that bind Noroviruses and the methods for identifying and synthesizing these peptides. It also relates to the detection of Noroviruses using said peptides or dendrimers formed by them.