摘要:
The present invention provides an arginase activity measurement method that easily and conveniently measures arginase activity with high sensitivity. The arginase activity measurement method includes a step of adding a sample including arginase and a solution including a divalent cation to a reaction vessel, and thereby activating arginase; a step of adding an arginine solution to the sample including the activated arginase, and performing an enzyme-substrate reaction; and a step of adding an acidic solution including a urea detection reagent and having a pH of from 1.0 to 4.0 to the sample subjected to the enzyme-substrate reaction, and simultaneously performing deactivation of enzyme and a urea detection reaction.
摘要:
The invention is concerned with methods of assaying the activity of enzymes based on measurement of fluorescence lifetime (FLT). In particular, the invention relates to assays for enzymes which are capable of modifying the structure of peptide substrates, including for example enzymes catalysing methylation, demethylation, acetylation, deacetylation or deimination of peptide substrates.
摘要:
The present invention relates to a method for determining the modification conditions of a therapeutic agent comprising (1) assaying the biological activity of a first modified therapeutic agent after the first modified therapeutic agent has been administered to a subject; (2) assaying the biological activity of the first modified therapeutic agent after at least one booster dose of the first modified therapeutic agent has been administered to said subject (3) carrying out (1) and (2) with an additional modified therapeutic agent that has been modified differently than the first modified therapeutic agent, and (4) comparing the biological activity of the first modified therapeutic agent with the biological activity of the additional modified therapeutic agent. The present invention also relates to modified therapeutic agents.
摘要:
The present invention refers to a method for inducing tumor apoptosis by influencing the ROS (reactive oxygen species) signaling pathway in tumor cells. Increasing the level of ROS leads to the selective inactivation of a tumor cell catalase and subsequently to an apoptosis of these cells. The level of ROS can be increased by increasing the level of nitric oxide through inhibition of the enzymes nitric oxide dioxygenase or arginase. According to the present invention inhibitors of the nitric oxide dioxygenase or arginase can be used for the manufacture of a medicament for the treatment of cancer. The present invention further provides a method for identifying compounds which can be used for the treatment of cancer, wherein the method allows to specifically identify compounds which induce apoptosis through the ROS signaling pathway. The present invention also provides a kit for identifying compounds which induce tumor apoptosis by inactivating a catalase on the tumor cell surface.
摘要:
The invention provides methods for determining the activity of an ammoniagenerating enzyme and methods for identifying a compound capable of modulating the activity of such an enzyme.
摘要:
Provided herein are methods and compositions for modulating apoptosis of cells and the lifespan of cells. These may be used for treating or preventing aging-related disorders and cancer.
摘要:
A creatine amidinohydrolase having the following physicochemical properties:
Action: catalyzing the following reaction; creatine + H 2 O → sarcosine + urea Optimum temperature: about 40 - 50°C Optimum pH: pH about 8.0 - 9.0 Heat stability: not more than about 50°C (pH 7.5, 30 min) Km value for creatine in a coupling assay using a sarcosine oxidase and a peroxidase: about 3.5 - 10.0 mM Molecular weight: about 43,000 (SDS-PAGE) Isoelectric point: about 3.5, a method for producing said enzyme, comprising culture of microorganism producing said enzyme, a method for the determination of creatine or creatinine in a sample using said enzyme, and a reagent therefor. According to the present invention, a creatine amidinohydrolase having a smaller Km value than that of the conventionally known creatine amidinohydrolase can be produced in an industrially large amount, and can be used as a routine reagent for clinical tests for determining creatine and creatinine in biological samples.
摘要翻译:具有以下物理化学性质的肌酸脒基水解酶:作用:催化下列反应; 肌酸+ H 2 O→肌氨酸+尿素最适温度:约40-50℃最适pH:pH约8.0-9.0热稳定性:不超过约50℃(pH7.5,30分钟)偶联测定中使用的Km值 肌氨酸氧化酶和过氧化物酶:约3.5-10.0mM分子量:约43,000(SDS-PAGE)等电点:约3.5,生产所述酶的方法,包括培养产生所述酶的微生物,测定肌酸 或使用所述酶的样品中的肌酸酐,及其试剂。 根据本发明,可以以工业上大量生产具有比常规已知的肌酸脒基水解酶更小的Km值的肌酸脒基水解酶,并且可以用作用于确定生物样品中的肌酸和肌酸酐的临床测试的常规试剂 。
摘要:
Zur enzymatischen Bestimmung von Creatinin in wäßrigen Lösungen setzt man das in der Probe enthaltene Creatinin mittels der Creatinin-Iminohydrolase zu 1-Methylhydantoin und einem ersten Molekül NH₃ um, überführt das gebildete 1-Methylhydantoin mittels der ATP-abhängigen 1-Methylhydantoinase und der N-Carbamoylsarcosin-Amidohydrolase in Sarcosin, CO₂ und ein zweites Molekül NH₃ und bestimmt beide gebildeten Moleküle NH₃ gemeinsam.
摘要:
Zur enzymatischen Bestimmung von Creatinin in wäßrigen Lösungen setzt man das in der Probe enthaltene Creatinin mittels der Creatinin-Iminohydrolase zu 1-Methylhydantoin und einem ersten Molekül NH₃ um, überführt das gebildete 1-Methylhydantoin mittels der ATP-abhängigen 1-Methylhydantoinase und der N-Carbamoylsarcosin-Amidohydrolase in Sarcosin, CO₂ und ein zweites Molekül NH₃ und bestimmt beide gebildeten Moleküle NH₃ gemeinsam.