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    • 86. 发明申请
    • Enzymatic Conversion of Blood Group A, B, and AB Red Blood Cells Using alpha-N-Acetylgalactosaminidases and alpha-Galactosidases with Unique Substrate Specificities and Kinetic Properties
    • 使用具有独特底物特异性和动力学性质的α-N-乙酰半乳糖胺酶和α-半乳糖苷酶对A组,B组和AB组血液细胞进行酶转化
    • US20140220553A1
    • 2014-08-07
    • US14201407
    • 2014-03-07
    • Velico Medical, Inc.
    • Henrik ClausenHumberto de la VegaCheryl HillQiyong Peter Liu
    • C12N5/078C12N9/40C12Q1/34
    • C12N5/0641C12N9/2402C12N9/2465C12Q1/34C12R1/465C12Y302/01022C12Y302/01049
    • This invention relates to enzymatic removal of type A and B antigens from blood group A, B, and AB reactive cells in blood products, and thereby converting these to non-A and non-B reactive cells. The invention further relates to using unique α-N-acetylgalactosaminidases and α-galactosidases with superior kinetic properties for removing the immunodominant monosaccharides of the blood group A and B antigens and improved performance in enzymatic conversion of red blood cells. The preferred unique α-N-acetylgalactosaminidases and α-galactosidases exhibit the following characteristics: (i) exclusive, preferred or no less than 10% substrate specificity for the type A and B branched polysaccharide structures relative to measurable activity with simple mono- and disaccharide structures and aglycon derivatives hereof: (ii) optimal performance at neutral pH with blood group oligosaccharides and in enzymatic conversion of cells: and (iii) a favorable kinetic constant Km with mono- and oligosaccharide substrates. The conversion methods of the invention use significantly lower amounts of recombinant glycosidase enzymes than previous and result in complete sera-conversion of all blood group A and B red cells.
    • 本发明涉及从血型A,B,AB型反应性细胞中分离A型和B型抗原,从而将其转化为非A型和非B型细胞。 本发明还涉及使用独特的α-N-乙酰半乳糖胺酶和具有优异动力学性质的α-半乳糖苷酶,用于去除血型A和B抗原的免疫优势单糖,并提高了红细胞酶促转化的表现。 优选的独特的α-N-乙酰半乳糖胺酶和α-半乳糖苷酶具有以下特征:(i)相对于简单的单糖和二糖的可测量的活性,对于A型和B型支链多糖结构,独特的,优选的或不低于10%的底物特异性 结构和糖苷配基衍生物:(ii)在中性pH下用血液寡糖和细胞的酶转化中的最佳性能:和(iii)具有单糖和寡糖底物的有利的动力学常数Km。 本发明的转化方法比以前使用显着更低量的重组糖苷酶,并导致所有血型A和B红细胞的完全血清转化。