Dextransucrase: studies on donor substrate specificity.

Dextransucrase: studies on donor substrate specificity.
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葡聚糖蔗糖酶:供体底物特异性的研究。

DOI:
10.1016/0003-9861(81)90409-4
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发表时间:
1981
影响因子:
3.9
通讯作者:
Mayer,RM
Mayer,RM
中科院分区:
生物学3区
文献类型:
--
作者:
Grier,TJ;Mayer,RM

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以前的研究(D. S. Genghoff和E. J. Hehre,Proc. Soc. Exp.生物医学,1972,140,1298-1301)已经表明,在葡萄糖的C-1上的α-连接的氟原子提供了足够的活化作用,使该类似物成为葡聚糖蔗糖酶的供体底物。为了研究供体底物结合位点的特异性,合成了一系列α-1-氟糖。在动力学实验中,已确定它们作为蔗糖(天然底物)的竞争性抑制剂。Ki的比较提供了关于葡萄糖部分中关于与酶结合的特定变化的重要性的信息。用几种β-1-氟糖和相应的游离单糖进行了类似的动力学研究。这些被发现是非竞争性抑制剂,并结合不良。α-1-氟代糖也被用作与已知受体反应的供体底物。除α-1-氟葡萄糖外,这些类似物均无此活性。
Previous studies (D. S. Genghoff and E. J. Hehre,Proc. Soc. Exp. Biol. Med., 1972,140, 1298–1301) have shown that an α-linked fluorine atom at C-1 of glucose provided sufficient activation to permit this analog to be a donor substrate for dextransucrase. In order to study the specificity at the donor substrate binding site, a series of α-1-fluorosugars have been synthesized. In kinetic experiments, it has been determined that they served as competitive inhibitors of sucrose, the natural substrate. A comparison of theKi's provided information about the importance of specific changes in the glucose moiety with regard to binding to the enzyme. Similar kinetic studies were carried out with several β-1-fluorosugars, and the corresponding free monosaccharides. These were found to be noncompetitive inhibitors, and to bind poorly. The α-1-fluorosugars were also examined as donor substrates in reactions with known acceptors. With the exception of α-1-fluoroglucose, none of these analogs were active in this capacity.
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DOI: 10.1152/ajpregu.1985.248.5.r627
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