140 results about "Enzyme assay" patented technology

The invention relates to a microfluidic platform and methods of using the platform for conducting enzyme assays using a droplet actuator. The enzyme assays of the invention are useful for, among other things, identifying and / or characterizing disorders resulting from conditions in which enzymes are defective or are produced in inappropriate amounts. Enzyme assays of the invention may, for example, be used to detect altered activity of a particular enzyme in a sample, which may serve as an indicator of a particular disease. Altered activity may, for example, be caused by conditions which result in the increased or reduced production of a certain enzyme or its substrate and / or conditions which result in defective enzymes and / or substrates exhibiting increased or decreased effectiveness relative to corresponding normal enzymes and / or substrates.

The invention relates to a microfluidic platform and methods of using the platform for conducting enzyme assays using a droplet actuator. The enzyme assays of the invention are useful for, among other things, identifying and / or characterizing disorders resulting from conditions in which enzymes are defective or are produced in inappropriate amounts. Enzyme assays of the invention may, for example, be used to detect altered activity of a particular enzyme in a sample, which may serve as an indicator of a particular disease. Altered activity may, for example, be caused by conditions which result in the increased or reduced production of a certain enzyme or its substrate and / or conditions which result in defective enzymes and / or substrates exhibiting increased or decreased effectiveness relative to corresponding normal enzymes and / or substrates.

The present invention relates to methods of conducting assays for enzymatic activity on microarrays useful for the large-scale study of protein function, screening assays, and high-throughput analysis of enzymatic reactions. The invention relates to methods of using protein chips to assay the presence, amount, activity and / or function of enzymes present in a protein sample on a protein chip. In particular, the methods of the invention relate to conducting enzymatic assays using a microarray wherein a protein and a substance are immobilized on the surface of a solid support and wherein the protein and the substance are in proximity to each other sufficient for the occurrence of an enzymatic reaction between the substance and the protein. The invention also relates to microarrays that have an enzyme and a substrate immobilized on their surface wherein the enzyme and the substrate are in proximity to each other sufficient for the occurrence of an enzymatic reaction between the enzyme and the substrate.

A mutiplexed enzyme assay method and substrate set for performing the method are disclosed. The method includes performing a plurality of enzyme reactions in the presence of a plurality of enzymes substrates, under conditions effective to convert an enzyme substrate to a corresponding product, where the product of each substrate and the substrate have different separation characteristics from each other and from the other substrates and their corresponding products. After performing the reactions, which may be carried out in separate or combined reactions, the substrates and products in said reactions are separated in a single separation medium. For each separated product and substrate, a separation characteristic effective to identify that product and substrate and a signal related to the amount of the product and substrate is detected. From this, one can determine the amount of substrate converted to the corresponding product in each of the reactions.

A high throughput screening method. At least one liquid sample is provided that includes an analyte that directly or indirectly produces a detectable characteristic in one or more first assays. A plurality of through holes is filled with portions of the liquid sample in a testing assembly that has a pair of opposing surfaces, each through hole extending from one of the opposing surfaces to the other of the opposing surfaces, with the through holes arranged in group. Surface tension holds the respective portions in the respective plurality of through holes. A detection is made of which of the through holes contains a liquid sample portion that includes said analyte. The detectable characteristic may be produced in various assays such as an absorbance transcription assay, a fluorescent transcription assay, a fluorescent secreted enzyme assay, or a microorganism screening assay.

The present invention relates to monoclonal antibodies that bind to the extracellular domain of prostate-specific membrane antigen (PSMA), hybridoma cell lines producing the antibodies, and methods of using such antibodies for diagnosis and treatment of cancer. In particular, thirty-five monoclonal antibodies reactive with PSMA expressed on the cell surface are exemplified. Additionally, the present invention relates to a novel protein variant (PSM′) of PSMA detected by a number of the antibodies of the invention. The hydrolase activity of PSMA and PSM′ allows the use of an immunoenzymatic assay for their detection.

Disclosed herein, the invention pertains to methods and compositions that find use in diagnostic, prognostic and characterization of neoplasia samples based on the ability of a neoplasia sample to cleave a MTS molecule of the present invention. In some embodiments, a MTS molecule disclosed herein has the formula (A-X-B-C), wherein A is a peptide with a sequence comprising 5 to 9 consecutive acidic amino acids, wherein the amino acids are selected from: aspartates and glutamates; B is a peptide with a sequence comprising 5 to 20 consecutive basic amino acids; X is a linker; and C is a detectable moiety.

An assay and kit for determining the activity of an enzyme such as kinase, ATPase and GTPase is disclosed. The assay and kit are useful in drug screening to select modulators of such an enzyme.

Systems and methods for enzyme assay using nanowire sensor are disclosed. In some embodiments, a substrate and a group suitable for assaying a target enzyme are identified. The selected substrate is immobilized to a nanowire. The target enzyme introduced to the immobilized substrate modifies the substrate to facilitate addition or removal of the selected group to or from the substrate by formation or breaking of a covalent bond between the group and the substrate. The activity of the target enzyme can be determined by measuring a change in an electrical property of the nanowire due to the addition or removal of the group to or from the immobilized substrate. Kinase and phosphatase are two example reactions that can be assayed by such a method.

Disclosed are fluorescent compositions and methods for detecting and / or characterizing enzymes and various uses thereof.

The invention relates to a method and reagent for immunological detection of a homogeneous enzyme determination technology, and is used for determination of the ADMA (N<G>,N<G>,dimethyl-L-arginine, asymmetric dimethylarginine, ADMA) content in a detected sample. According to the invention, anti-ADMA specific antibodies and enzyme-ADMA complexes are used, the immunological reaction of the enzyme-ADMA complexes and the anti-ADMA specific antibodies is utilized, after antigen antibody complexes are formed, the activity of the enzyme-ADMA complexes is inhibited, the changes of enzymatic activity in a reaction system is determined to obtain the number of combined enzyme markers, so as to obtain the content of ADMA in the detected sample. The method has the advantage of capability of realizing immunoassay as the common biochemical enzyme method, so as to simultaneously determine multiple samples on a full-automatic biochemical analyzer.

A method of biological assay comprises the steps of providing an enzyme substrate comprising two fluorescence dye groups bound to a flexible peptide, the dye groups being of proximity sufficiently close so as to allow free energy attractions to draw the dyes together to essentially self-quench fluorescence of the dye groups, wherein self quenching of fluorescence of the dye groups is effected by dye dimerization or stacking, and enzymatically cleaving the peptide to release the fluorescence dye groups from dye dimerization or stacking, thereby producing an increase in fluorescence intensity. A protease substrate for use in the method of the invention is also disclosed. This invention finds use in detection and identification of microorganisms, sterilization assurance, pharmaceutical discovery, enzyme assays, immunoassays, and other biological assays.

The invention relates to a new method for measuring phospholipase A1 or A2 activity in a sample, using a solid phase coated with a fluorochrome-labelled phospholipase A1 or A2 substrate, wherein the molecular coverage is in the range from 8 to 30 fluorochrome-labelled phospholipase A1 or A2 substrate molecules / nm2, and kit for carrying out said method.

A method and apparatus are provided for detecting contaminants, such as ethylene glycol and diethylene glycol, in various materials, including household products, and medicines. The contaminants can be detected using enzyme assays that produce measurable changes in light absorption and / or light fluorescence.

The present invention provides a method for determining the intracellular activity of ROCK kinase comprising, providing a sample of cells to be tested for ROCK kinase activity, determining the level of phosphorylation of MYPT1 in the sample, and determining the intracellular activity of ROCK kinase in the sample of cells, wherein the level of MYPT1 phosphorylation directly correlates with the level of intracellular ROCK kinase activity. The invention further provides a method for identifying an agent that inhibits the intracellular activity of ROCK kinase comprising, providing a sample of cells having ROCK kinase activity, determining the degree of reduction of phosphorylation of MYPT1 in the sample by contacting the sample of cells with a test agent and comparing the MYPT1 phosphorylation level with the phosphorylation level of MYPT1 in an identical control sample of cells that was not contacted with the test agent, determining the degree of inhibition of intracellular activity of ROCK kinase in the sample of cells contacted with the agent, wherein the level of MYPT1 phosphorylation directly correlates with the level of intracellular ROCK kinase activity, and thus determining whether the test agent is an agent that inhibits the intracellular activity of ROCK kinase. The test agent may for example be a compound not known to have ROCK kinase inhibitory activity, or a compound identified by an in vitro ROCK kinase assay as having inhibitory activity.

Disclosed is a compound of Formula (I), wherein: L is a linking agent; B is a binding agent; X is an atom or group suitable for attaching L to the glycerol chain; and R is a straight chain saturated or unsaturated alkyl group having from 8 to 30 carbon atoms, substituted with M' or M" wherein at least one of M' and / or M" is a detectable label. The compound can be used as a lipase substrate in a solid phase-based assay system, such as a scintillation proximity assay, to detect lipase enzyme activity.

The internally calibrated electrochemical continuous enzyme assay (ICECEA) was developed for the fast determination of enzyme activity unit. The assay uses integration of enzyme-free pre-assay calibration with the actual enzyme assay in one continuous experiment. Such integration results in a uniquely shaped amperometric trace that allows for the selective and sensitive determination of enzymes.