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    • 7. 发明授权
    • Use of trans-sialidase and sialyltransferase for synthesis of
sialyl.alpha.2.fwdarw.3.beta.galactosides
    • 使用唾液酸酶和唾液酸转移酶合成唾液酸α2->3β半乳糖苷
    • US5409817A
    • 1995-04-25
    • US57528
    • 1993-05-04
    • Yukishige ItoJames C. Paulson
    • Yukishige ItoJames C. Paulson
    • C12N9/10C12N9/12C12N9/24C12P19/26C12P19/44C12N11/00C12P19/00C12P19/18
    • C12N9/1241C12N9/1081C12N9/2402C12P19/26C12Y302/01018
    • A single vessel cyclic synthesis process for preparation of a sialyl.alpha.2.fwdarw.3.beta.galactoside is disclosed. In accordance with this process, a sialyltransferase acceptor is sialylated in an aqueous reaction medium by an .alpha.(2,3)sialyl transferase and CMP-sialic acid to form a sialyl donor substrate and CMP. In the presence of the trans-sialidase of Trypanosoma crusi, that sialyl donor substrate provides a sialyl group for a trans-sialidase acceptor, thereby preparing the sialyl.alpha.2.fwdarw.3.beta.galactoside. The .alpha.(2,3)sialyltransferase acceptor is reformed upon trans-sialidation of the latter acceptor, and the sialyl donor substrate is reformed using the .alpha.(2,3)sialyltransferase and a CMP-sialic acid recycling system that combines CMP with sialic acid that is also present in the vessel. The K.sub.m /V.sub.max value for the .alpha.(2,3)sialyltransferase acceptor is less than one-tenth the value of K.sub.m /V.sub.max of the trans-sialidase acceptor for the .alpha.(2,3)sialyltransferase.
    • 公开了用于制备唾液酸α2->3β半乳糖苷的单容器循环合成方法。 根据该方法,唾液酸转移酶受体通过α(2,3)唾液酸转移酶和CMP-唾液酸在水性反应介质中唾液酸化以形成唾液酸供体底物和CMP。 在克氏锥虫的唾液酸酶的存在下,唾液酸供体底物为唾液酸酶受体提供唾液酸基,从而制备唾液酸α2->3β半乳糖苷。 将α(2,3)唾液酸转移酶受体通过后一个受体的反式唾液酸化进行重组,并且使用α(2,3)唾液酸转移酶和将CMP与唾液酸组合的CMP-唾液酸回收系统重组唾液酸供体底物 这也存在于船上。 α(2,3)唾液酸转移酶受体的Km / Vmax值小于α(2,3)唾液酸转移酶的唾液酸酶受体的Km / Vmax值的十分之一。