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    • 5. 发明申请
    • NOVEL DETECTION METHOD FOR A FUNCTIONALLY ACTIVE FORM OF AN ENZYME IN BIOLOGICAL SAMPLES AND A KIT
    • 用于生物样品中酶的功能活性形式的新型检测方法和试剂盒
    • WO0138560A2
    • 2001-05-31
    • PCT/US0032315
    • 2000-11-22
    • AMERICAN NAT RED CROSSLAWRENCE DANIEL ADAY DUANE
    • LAWRENCE DANIEL ADAY DUANE
    • C12Q1/37C12Q1/56G01N33/573C12Q1/00
    • G01N33/573C12Q1/37C12Q1/56
    • The present method utilizes the capture of the functionally active form of an enzyme that covalently binds or binds with a dissociation constant of 1 x 10 M or less to an enzyme inhibitor or mutant thereof. The present invention is directed to a method for detecting a functionally active form of an enzyme in a biological sample, comprising contacting an enzyme inhibitor or mutant thereof immobilized on a solid substrate with the biological sample, and measuring the binding of the enzyme inhibitor or mutant thereof to the active form of the enzyme by a detectable label, wherein the enzyme inhibitor specifically forms a covalent bond or binds with a dissociation constant of 1 x 10 M or less with the active form of the enzyme. Further, the present invention is directed to an analytical element useful for carrying out the detection of a functionally active form of an enzyme in biological sample, that includes an enzyme inhibitor or mutant thereof immobilized on a solid substrate, wherein the enzyme inhibitor specifically binds or binds with a dissociation constant of 1 x 10 M or less to the active form the enzyme. This analytical element is included in a kit with an analytical reagent conjugated to a detectable label or conjugated to a reactive molecule that generates a detectable label, wherein the reagent specifically binds to the active form of the enzyme that binds to the enzyme inhibitor. Specific enzyme inhibitors or mutants thereof are designed to covalently bind to specific clinically important enzymes. These enzyme inhibitors contain modifications that facilitate binding to a solid support and optionally modifications that affect the binding to a target enzyme or affect the stability of the inhibitor. The method is particularly useful in measuring the presence of enzymes, such as tPA, elastase, cathepsin G and prostate specific antigen. Also disclosed is a method of immobilizing enzyme inhibitors or mutants thereof on a solid substrate yet retaining the property of covantly binding or binding with a dissociation constant of 1 x 10 M or less to a funcitonally active enzyme.
    • 本发明的方法利用对酶抑制剂或其突变体以1×10 -9 M以下的解离常数共价结合或结合的功能活性形式的捕获。 本发明涉及一种用于检测生物样品中酶的功能活性形式的方法,包括使固定在固体基质上的酶抑制剂或突变体与生物样品接触,并测量酶抑制剂或突变体 通过可检测的标记物到酶的活性形式,其中酶抑制剂特异性形成共价键或以1×10 -9 M或更小的解离常数与酶的活性形式结合。 此外,本发明涉及用于进行生物样品中功能活性形式的酶的检测的分析元件,其包括固定在固体底物上的酶抑制剂或突变体,其中所述酶抑制剂特异性结合或 以1×10 -9 M或更小的解离常数与酶的活性形式结合。 该分析元件包含在试剂盒中,其中分析试剂与可检测标记物缀合或与产生可检测标记物的反应性分子缀合,其中该试剂特异性结合与酶抑制剂结合的酶的活性形式。 特异性酶抑制剂或其突变体被设计为共价结合特定的临床上重要的酶。 这些酶抑制剂含有促进结合固体支持物和任选地影响靶酶结合或影响抑制剂稳定性的修饰。 该方法特别可用于测量酶的存在,例如tPA,弹性蛋白酶,组织蛋白酶G和前列腺特异性抗原。 还公开了一种将酶抑制剂或其突变体固定在固体底物上的方法,但仍保持与1×10 -9 M或更低的解离常数有机结合或结合的功能。