38 results about "S-Adenosylhomocysteine" patented technology

This invention pertains to a method for detecting a compound in the presence of other compounds that are substantially similar in structure and metabolically related to the analyte. The invention is particularly suited for the detection of S-adenosylmethionine in the presence of S-adenosylhomocysteine, other nucleosides and derivatives in a biological sample. The methods of this invention involve an antibody produced specifically against S-adenosylmethionine; particularly, analogs modified strategically at the sulfonium position. An assay protocol comprises chemically modified analyte analog linked to an enzymatic reporter and the aforementioned antibody was used to demonstrate the assay specificity and sensitivity. Additional assay method with immobilized immunogen, the specific antibody, and an enzyme labeled secondary antibody was also described for illustration. The invention also features hapten design and novel compounds used as haptens to prepare immunogen and for the specific antibody production.

The invention provides a method of detecting the presence or absence of a disease in a patient wherein said disease is accompanied by deficient levels of S-adenosylmethionine comprising: identifying a patient that is suspected of having said disease or is at risk of having said disease; obtaining a biological sample from said patient; determining the level of S-adenosylmethionine in said biological sample using an antibody derived from a hapten analog of S-adenosylmethionine; and correlating the level of S-adenosylmethionine in said biological sample with the presence, absence, or severity of said disease. The invention also provides methods for measuring SAH which is used to determine the methylation index (ratio of SAM / SAH) in biological fluids which is indicative of the health status of an individual. Additionally, the invention includes test strips which are useful for determining S-adenosylmethionine and S-adenosylhomocysteine.

Provided are methods of designing a putative inhibitor of a 5′-methylthioadenosine / S-adenosylhomocysteine nucleosidase. The methods comprise designing a chemically stable compound that resembles the charge and geometry of the 5′-methylthioadenosine / S-adenosylhomocysteine nucleosidase transition state. Also provided are methods of inhibiting 5′-methylthioadenosine / S-adenosylhomocysteine nucleosidases using the inhibitors found by the above methods.

The present invention relates to compositions and methods for assaying homocysteine (Hcy) and thus related moieties, e.g., S-adenosylhomocysteine (SAH) or adenosine. More particularly, assay methods that employ, mutant SAH hydrolase having binding affinity for Hcy, SAH or adenosine but has attenuated catalytic activity, are provided. The modified enzymes and fusion proteins containing the modified enzymes are also provided.

This invention relates to the production of new & stable salts of S-adenosyl-L-methionine SAMe). The source of SAMe used in the salt formation is from chemical process wherein stereoselective methylation of S-adenosyl-L-homocysteine is achieved. The process for the salt preparation is simple, efficient & reproducible on large scale. The new salts were found to be stable at accelerated temperature for minimum 3 months.

A medical application of S-adenosine homocysteine in preparing immunodepressant with high effect and low poison is disclosed.

The invention discloses a diabetic nephropathy diagnostic kit and the application thereof, and particularly discloses the application of inosine serving as a biomarker in preparation of a diagnostic kit for diabetes and the diabetic nephropathy, and the application of the combination of the inosine, adenosine and S-adenosyl homocysteine and the combination of the adenosine, the S-adenosyl homocysteine and linoleic acid serving as markers in preparation of the diabetic nephropathy diagnostic kit. The invention also discloses the diagnostic kit prepared by the biomarkers, which can be used for distinguishing the diabetic nephropathy and staging different development stages of the diabetic nephropathy, performing screening and assessment analysis on the treatment medicaments for different development stages of the diseases, and provides accurate basis for the treatment and the diagnosis of the diabetes and the diabetic nephropathy.

The invention provides a method of detecting the presence or absence of a disease in a patient wherein said disease is accompanied by deficient levels of S-adenosylmethionine comprising: identifying a patient that is suspected of having said disease or is at risk of having said disease; obtaining a biological sample from said patient; determining the level of S-adenosylmethionine in said biological sample using an antibody derived from a hapten analog of S-adenosylmethionine; and correlating the level of S-adenosylmethionine in said biological sample with the presence, absence, or severity of said disease. The invention also provides methods for measuring SAH which is used to determine the methylation index (ratio of SAM / SAH) in biological fluids which is indicative of the health status of an individual. Additionally, the invention includes test strips which are useful for determining S-adenosylmethionine and S-adenosylhomocysteine.

The invention discloses a method for measuring the activity of transmethylase in real time and a kit. The method comprises two reactions carried out at the same time in a reaction system; according to the first reaction, in a buffer system where it is guaranteed that S-ademetionine is adopted as a methyl donor and the transmethylase has the biological activity, a sample containing the transmethylase (MT), the methyl donor and a corresponding substrate are added, or the S-ademetionine methyl donor and the corresponding substrate are directly added into the liquid sample containing the transmethylase, and a reaction is carried out so that an S-adellosyl homocysteine (SAH) product can be generated, wherein the substrate is receptor matter of methyl; according to the second reaction, an immunological method is adopted for detecting the content of SAH to determine the activity of the transmethylase in the reaction system. The biochemical reaction of MT catalysis and the immunoreactions for measuring the product SAH are carried out at the same time, the two processes are organically combined, and great significance is especially achieved on accurate measurement of SAH with extremely unstable molecularity.

The invention provides a preparation method of S-adenosyl homocysteine ​​artificial complete antigen, comprising the following steps: mixing S-adenosyl homocysteine ​​and di-tert-butyl dicarbonate to obtain a first The intermediate, the di-tert-butyl dicarbonate is used to protect the antigenic epitope in S-adenosyl homocysteine; the carrier protein is added to the first intermediate, and a second intermediate is obtained after the reaction and removing the di-tert-butyl dicarbonate in the second intermediate to obtain the S-adenosyl homocysteine ​​artificial complete antigen. The S-adenosyl homocysteine ​​artificial complete antigen prepared by the method has high specificity, selectivity and immunogenicity. The present invention also provides an S-adenosyl homocysteine ​​artificial complete antigen prepared by the method and an application of the S-adenosyl homocysteine ​​artificial complete antigen in antibody preparation.

This invention relates to an improved process for the industrial manufacture of S-adenosyl-L-methionine (SAMe) of formula (I), which consists of stereo-selective methylation of S-adenosyl-L-homocysteine (SAH) with the enrichment of active (S,S)-isomer.