Bare Histidine-Serine Models: Implication and Impact of Hydrogen Bonding on Nucleophilicity
作者:Julien Leclaire、Messaoud Mazari、Yuan Zhang、Colin Bonduelle、Olivier Thillaye du Boullay、Blanca Martin-Vaca、Didier Bourissou、Innocenzo De Riggi、Rémy Fortrie、Frédéric Fotiadu、Gérard Buono
DOI:10.1002/chem.201301275
日期:2013.8.19
A new family of 2‐hydroxyalk(en/yn)ylimidazoles has been evaluated as serine–histidine bare dyad models for the ring‐opening reaction of L‐lacOCA, a cyclic O‐carboxyanhydride. These models were selected to unravel the implication of intramolecular hydrogen bonding and to substantiate its influence on the nucleophilicity of the alcohol moiety, as it is suspected to occur in enzyme active sites. Although
一个新的2-羟基烷(en / yn)咪唑家族被评估为L -lacOCA(一种环状O环)的开环反应的丝氨酸-组氨酸裸二联体模型。-羧酸酐。选择这些模型是为了阐明分子内氢键的含义并证实其对醇部分亲核性的影响,因为怀疑它发生在酶活性位点。尽管设计这些专用于在研究的开环反应过程中专门促进质子转移的初步步骤,但这些极简模型描述了相对于分离的片段而言可测量的反应性增加。已经开发了两种可靠的实验和理论方法来容易地监测稀溶液中分子内氢键的强度。结果显示,由于分子内氢键,折叠的构象异构体是最亲核的物种。