An oxyanion-Hole selective serine protease inhibitor in complex with trypsin
摘要:
p-amidinophenylmethylphosphinic acid (AMPA) was designed, synthesized and crystallized in complex with trypsin to study interactions with the oxyanion hole at the S1 site. In comparison to benzamidine, AMPA shows improved activity, which the crystal structure demonstrates to result from hydrogen bonds between the negatively charged phosphinic acid group and the catalytic residues at the oxyanion hole. (C) 2001 Elsevier Science Ltd. All rights reserved.
An oxyanion-Hole selective serine protease inhibitor in complex with trypsin
摘要:
p-amidinophenylmethylphosphinic acid (AMPA) was designed, synthesized and crystallized in complex with trypsin to study interactions with the oxyanion hole at the S1 site. In comparison to benzamidine, AMPA shows improved activity, which the crystal structure demonstrates to result from hydrogen bonds between the negatively charged phosphinic acid group and the catalytic residues at the oxyanion hole. (C) 2001 Elsevier Science Ltd. All rights reserved.
method and could easily be purified after isolation. The intermediate formation of the organozinc species is essential, as it prevents the formation of multiple substitution products. Important are also the reaction conditions: the usage of the proper solvent for the respective aromatic precursors and removal of the remaining salts by addition of a dioxane/pentane mixture. Depending on the solvent and
The relationship between surface derivatization and the physical properties of bisarylphosphinidenetriironnonacarbonyl clusters
作者:Joanna L. Perkinson、Mu-Hyun Baik、Geoffrey E. Trullinger、Cynthia K. Schauer、Peter S. White
DOI:10.1016/s0020-1693(99)00246-7
日期:1999.11
Abstract A series of clusters, Fe3(CO)9(μ3-P–p-C6H4X)(μ3-P–p-C6H4X′) (X=X′=NMe2, OCH3, CH3, Cl, CF3, CN; X=CN, X′=NMe2) has been prepared using functionalized p-XC6H4PCl2 starting materials. The influence of changes in the X groups on the physical properties of the Fe3(CO)9cluster core are examined. This cluster series displays two one-electron reductions to produce stable radical monoanions and diamagnetic
摘要一系列簇Fe3(CO)9(μ3-P-p-C6H4X)(μ3-P-p-C6H4X')(X = X'= NMe2,OCH3,CH3,Cl,CF3,CN; X = CN,X'= NMe2)已经使用官能化的p-XC6H4PCl2起始材料制备。考察了X基团的变化对Fe3(CO)9团簇核的物理性质的影响。该簇系列显示出两个单电子还原,以生成稳定的自由基单阴离子和反磁性双阴离子,从而可以检查所有三种物质的行为。红外光谱,31P和1H NMR光谱和电子顺磁共振(自由基单阴离子)光谱,以及该系列的两个成员Fe3(CO)9(μ3-P–p-C6H4X)(μ3-P–通过单晶X射线衍射法得到的p-C6H4X′)(X = X′= NMe2; X = CN,X′= NMe2)均表明簇结构对于X的性质是不变的。哈米特线性自由能关系用于量化所观察到的团簇性质变化。通过Hammett方程分析红外,电子顺磁共振和循环伏安数