Synthesis and inhibitory properties of (1R,2R,4R,6 R)-6-O -(2-hydroxyethyl)cyclohexane-1,2,4,6-tetraol derivatives: mechanistic probes for the inositol monophosphatase reaction 1
作者:Jürgen Schulz、David Gani
DOI:10.1039/a605998h
日期:——
The phosphate derivatives 2, 3 and 4 of
6-O-(2-hydroxyethyl)cyclohexane-1,2,4,6-tetraol have been
designed to inhibit inositol monophosphatase, the putative target for
lithium therapy, by interacting simultaneously with both cofactor metal
ions at the active site of the enzyme. The compounds have been
synthesised, via the known key common intermediate cyclohexene
oxide, from cyclohexane-1,4-diol in moderate yield, and have been tested
for activity in standard enzyme assays. Each compound serves as a
competitive inhibitor and displays the expected inhibitory properties.
Indeed, compound 4 and the cyclic phosphate 3 of
6-O-(2-hydroxyethyl)cyclohexane-1,2,4,6-tetraol are,
respectively, the most potent examples of a primary alkyl phosphate
inhibitor and a phosphate monoanion inhibitor yet reported for the
enzyme. The stereochemistry of the most potent inhibitor,
(1R,2R,4R,6R)-2 as deduced from the
X-ray crystal structure of a synthetic precursor, provides useful
mechanistic insight into the action of the enzyme and the mode of
inhibitor binding.
6-O-(2-羟乙基)环己烷-1,2,4,6-四醇的磷酸衍生物2、3和4,被设计用于通过同时与酶活性位点的辅因子金属离子相互作用来抑制肌醇单磷酸酶,这是锂疗法的假定靶点。这些化合物通过已知的共同关键中间体环己烯氧化物,从中等产率的环己烷-1,4-二醇合成,并在标准酶活性测试中进行了活性测试。每个化合物作为竞争性抑制剂,并显示出预期的抑制特性。事实上,6-O-(2-羟乙基)环己烷-1,2,4,6-四醇的化合物4和环状磷酸3分别是迄今为止报告的最强效的初级烷基磷酸抑制剂和磷酸单阴离子抑制剂。从合成前体的X射线晶体结构推断的最强效抑制剂的立体化学(1R,2R,4R,6R)-2为酶的作用机制和抑制剂结合方式提供了有用的机理洞察。