摘要:
This invention provides an amadoriase having high reactivity with ±-fructosyl hexapeptide (±F6P) derived from the ²-chain amino terminus of glycated hemoglobin (HbAlc), which enables satisfactory quantification of ±F6P cleaved from HbAlc. A novel amadoriase is derived from the amadoriase of the genus Coniochaeta by substitution of one or more amino acids at positions selected from the group consisting of positions 62, 63, 102, 106, 110, 113, 355, and 419. Such amadoriase enables rapid, simple, accurate, and satisfactory quantification of ±F6P cleaved from HbAlc. With the use of such amadoriase, a method for measurement of HbAlc by an enzymatic method and a kit for measurement of HbAlc that are based on the same principle as used in the conventional standard method and excellent in terms of the relevance with the standard method.
摘要:
Provided is a composition by which glycated hemoglobin can be measured even in the presence of a stronger surfactant than a conventional case. Also provided is a buffer and/or stabilizer which maintains the residual activity of an amadoriase or lowers a reduction of residual activity. The present invention provides a composition for use in measuring glycated hemoglobin containing an amadoriase having substitution of one or more amino acid residues at a position(s) corresponding to an amino acid(s) selected from the group consisting of position 262, position 257, position 249, position 253, position 337, position 340, position 232, position 129, position 132, position 133, position 44, position 256, position 231 and position 81 of an amadoriase derived from the genus Coniochaeta and represented by SEQ ID No: 1 or 3, and having residual activity even in the presence of a surfactant. The present invention also provides a composition and kit for use in measuring glycated hemoglobin, comprising a specific stabilizer and/or a buffer. The present invention can provide an enzyme and a composition for use in measuring glycated hemoglobin, excellent in storage stability even if they are exposed to a surfactant.
摘要翻译:提供了通过该糖化血红蛋白甚至可以在表面活性剂比常规情况下更强的存在下测得的组合物。 如此提供的是其保持阿马道里的残余活性或降低的降低残留活性的缓冲液和/或稳定剂。 本发明提供了在测量糖化血红蛋白在阿马含有具有一个或多个氨基酸残基取代在在选自262位选择的氨基酸(S)对应于位置(S),位置257中使用的组合物, 位置249,位置253,位置337,位置340,位置232,位置129,位置132,位置133,位置44,位置256,位置231和从该属锥毛壳衍生和由SEQ ID NO的阿马道里酶的位置81: 1或3,并且具有即使在表面活性剂存在的残余活性。 本发明因此提供了在测量糖化血红蛋白中使用的组合物和试剂盒,包括一个特定的稳定剂和/或缓冲剂。 本发明可以提供酶和测量糖化血红蛋白,具有优异的储存稳定性,即使它们被暴露到表面活性剂中使用的组合物。
摘要:
This invention provides an amadoriase that acts on the ²-chain of hemoglobin A1c (HbA1c) and generates hydrogen peroxide, a method for measurement of HbA1c using such amadoriase, and a reagent kit for measurement of HbAlc using such amadoriase. The method for measurement of HbAlc involves the use of an amadoriase that has specific activity of 0.1 U/mg or greater to ±F6P and oxidizes the HbA1c ²-chain amino terminus so as to generate hydrogen peroxide, and the reagent kit for measurement of HbA1c comprises such amadoriase. The method and the kit for measurement of HbAlc enable quantification of HbAlc to be performed rapidly, simply, and accurately.
摘要:
This invention provides an amadoriase that can react with a wide variety of glycated peptides generated upon hydrolysis of the ² chain of hemoglobin A1c (HbA1c) to generate hydrogen peroxide, a method for measurement of HbAlc using such amadoriase, and a reagent kit for measurement of HbAlc using such amadoriase. Provided is an amadoriase obtained by substitution of one or more amino acids at positions corresponding to amino acids selected from the group consisting of amino acids 62, 63, 102, 106, 110, 113, and 355 in the amino acid sequence of the amadoriase derived from the genus Coniochaeta or the like which amadoriase is capable of oxidizing a wide variety of glycated peptides to generate hydrogen peroxide. Further provided is a method for measurement of HbAlc comprising using such amadorise as well as a reagent kit for measurement of HbAlc comprising such amadoriase. This invention can provide a method for measurement of HbAlc that enables quantification of HbAlc to be performed rapidly, simply, and accurately with the use of a small amount of a protease and a kit used for such measurement. This invention can also provide a method for measurement of HbAlc that enables quantification of HbAlc to be performed rapidly, simply, and accurately, with high sensitivity with the use of a small amount of a protease and a kit used for such measurement.
摘要:
Provided is an amadoriase having heat resistance superior to that of conventionally known amadoriase. Provided is an amadoriase having substitution or deletion of one or more amino acid residues at positions corresponding to amino acids selected from the group consisting of three amino acid residues from the carboxyl terminal and amino acids at positions 151, 43, 53, 267, 350, 185, 196, 299 and 323 in the amino acid sequence of Amadoriase derived from Coniochaeta species indicated in SEQ ID NO: 1. Enzyme and glycated hemoglobin assay kits can also be provided that have superior storage stability even in the case of being subjected to increasingly severe temperature conditions such as during distribution at ambient temperatures, long-distance transport or in the production of oxygen sensors.
摘要:
Provided are an amadoriase that is less likely to be influenced by oxygen concentration and a method and a reagent kit for measurement of HbAlc using such amadoriase. Provided are an amadoriase that is obtained via substitution of one or more amino acid residues at a position or positions corresponding to the position(s) selected from the group consisting of positions 280, 267, 269, 54, and 241 of the amadoriase derived from the genus Coniochaeta, a method for measurement of HbA1c, a reagent kit for measurement, and a sensor using such amadoriase. The modified amadoriase according to the invention has a lowered oxidase activity and an enhanced dehydrogenase activity, and this enables the use of an electron mediator, and this reduces the influence of oxygen concentration. Thus, HbAlc can be measured with high sensitivity.