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以腺苷5'-[γ(S)-16O,17O,18O]三磷酸为底物时酵母己糖激酶催化的磷酰基转移的立体化学过程。

The stereochemical course of yeast hexokinase-catalysed phosphoryl transfer by using adenosine 5'[gamma(S)-16O,17O,18O]triphosphate as substrate.

作者信息

Lowe G, Potter B V

出版信息

Biochem J. 1981 Oct 1;199(1):227-33. doi: 10.1042/bj1990227.

Abstract

Adenosine 5'[gamma(S)-16O, 17O, 18O]triphosphate has been synthesized and used to determine the stereochemical course of phosphoryl transfer catalysed by yeast hexokinase. The chirality at phosphorus of the D-glucose 6-[16O,17O,18O]phosphate formed was analysed, after cyclization and methylation, by 31P n.m.r. spectroscopy. The phosphoryl transfer was found to occur with inversion of configuration, with a stereoselectivity in excess of 94%. The simplest interpretation of this result is that the phosphoryl group is transferred between substrates in the enzyme-substrate ternary complex by an 'in line' mechanism.

摘要

5'-[γ(S)-16O, 17O, 18O]三磷酸腺苷已被合成,并用于确定酵母己糖激酶催化的磷酰基转移的立体化学过程。在环化和甲基化后,通过31P核磁共振光谱分析了形成的D-葡萄糖6-[16O,17O,18O]磷酸酯磷原子处的手性。发现磷酰基转移以构型翻转的方式发生,立体选择性超过94%。对该结果最简单的解释是,磷酰基通过“直线”机制在酶-底物三元复合物中的底物之间转移。

相似文献

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Stereochemistry of phosphoryl transfer.磷酰基转移的立体化学
Philos Trans R Soc Lond B Biol Sci. 1981 Jun 26;293(1063):75-92. doi: 10.1098/rstb.1981.0062.

本文引用的文献

6
Mechanism of phosphoryl transfer by hexokinase.
Biochem Biophys Res Commun. 1980 May 30;94(2):573-8. doi: 10.1016/0006-291x(80)91270-x.
7
Enzyme-catalyzed phosphoryl transfer reactions.酶催化的磷酰基转移反应。
Annu Rev Biochem. 1980;49:877-919. doi: 10.1146/annurev.bi.49.070180.004305.
9
The hexokinases: kinetic, physical, and regulatory properties.己糖激酶:动力学、物理及调节特性
Adv Enzymol Relat Areas Mol Biol. 1973;39:249-326. doi: 10.1002/9780470122846.ch4.
10
Thiophosphate-analogues and 1-N-oxides of ATP and ADP in mitochondrial translocation and phosphoryl-transfer reactions.
Eur J Biochem. 1973 Dec 17;40(2):485-91. doi: 10.1111/j.1432-1033.1973.tb03217.x.

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