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首页> 外文期刊>Crystal growth & design >Two concomitant polymorphs of a supramolecular model of the Asp center dot center dot center dot His center dot center dot center dot Ser catalytic triad
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Two concomitant polymorphs of a supramolecular model of the Asp center dot center dot center dot His center dot center dot center dot Ser catalytic triad

机译:Asp中心点中心点中心点His的超分子模型的两个同时多晶型

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摘要

The supramolecular chemistry and crystal structures of two concomitant polymorphs (1 and 2) of a 1:2:2 complex between betaine, imidazole, and picric acid are reported. Cocrystallization of these complexes gives discrete aggregates composed of five different molecules joined by four N-H-... O and four C-H-... O hydrogen bonds. These interactions define a supramolecular unit with a unique composition, structure, and connectivity between the molecular components that is common to both polymorphs despite considerable differences in crystal packing. The network of hydrogen bonds between betaine, imidazole, and picric acid mimics the connectivity present in the Asp(...) His(...) Ser catalytic triad and serves as a structural model for hydrogen bonding in the active site of serine proteases.
机译:甜菜碱,咪唑和苦味酸之间的1:2:2配合物的两个伴随多晶型物(1和2)的超分子化学和晶体结构被报道。这些配合物的共结晶得到由五个不同分子组成的离散聚集体,这些分子由四个N-H -... O和四个C-H -... O氢键连接。这些相互作用定义了一个超分子单元,具有独特的组成,结构和分子成分之间的连通性,尽管晶体堆积存在很大差异,但两种多晶型物共有该分子。甜菜碱,咪唑和苦味酸之间的氢键网络模仿了Asp(...)His(...)Ser催化三联体中的连接性,并用作丝氨酸蛋白酶活性位点中氢键的结构模型。

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