HOST GUEST METALLOPROTEIN MIMICS

该研究项目的最终目标是开发 可通过抑制锌而治疗的疾病的治疗剂 水解酶，包括类风湿和骨关节炎， 牙周炎青光眼和癌症这些代理的设计需要 了解（1）酶的机制和（2）酶的能量 酶和抑制剂之间的结合相互作用。催化 机制和抑制剂结合能是许多不同的 力.很难衡量单个类型的贡献 酶的大小和复杂性决定了它的相互作用。这项建议 集中在两个最高度研究的锌水解酶， 碳酸酐酶和羧肽酶A。据信，许多其他 锌酶在结构上相似并且利用相似的机制。 我们选择了具体的方法来解决酶激活 在活性部位与锌配位的水。碳的研究 脱水酶表明，疏水相互作用，氢键，和 锌离子或水附近羧酸盐的存在影响酶 活性和抑制剂结合，但幅度和详细的 这些影响的物理基础尚不清楚。这项建议旨在 量化影响，并确定如何以及为什么所述的相互作用 手术。在羧肽酶A中，总的机制路径仍然是一个 这是一个有争议的问题，更不用说路径的细节了。 目前还没有与锌形成络合物的配体， 几何形状与CPA中发现的几何形状非常相似。该提案包括 开发这种配体的计划。结合研究将用于确定 在不存在次级抑制剂的情况下， 酶活性位点的相互作用。一旦这一目标实现， 配体将被制备，其量化了一些分子的贡献。 已知的活性位点次级相互作用。拟议的作用机制 羧肽酶A将在精心设计的模型复合物中进行测试。 用于实现本研究目标的工具包括分子设计 以及模型配合物的合成。这些复合体将 通过X射线晶体学、电位测定法、量热法 动力学研究和其他技术。

The ultimate goal of this research project is the development of therapeutic agents for diseases that can be treated by inhibiting zinc hydrolytic enzymes, including rheumatoid and osteoarthritis, periodontitis, glaucoma, and cancer. The design of these agents requires a knowledge of (1) the mechanism of the enzyme and (2) the energies of binding interactions between the enzyme and an inhibitor. The catalytic mechanisms and inhibitor binding energies are the sum of many varied forces. It is difficult to measure the contribution of an individual type of interaction in an enzyme due to its size and complexity. This proposal focuses on two of the most highly studied zinc hydrolytic enzymes, carbonic anhydrase and carboxypeptidase A. It is believed that many other zinc enzymes are similar in structure and utilize similar mechanisms. We have chosen to address specifically the means by which enzymes activate water that is coordinated to zinc in the active site. Studies of carbonic anhydrase suggest that hydrophobic interactions, hydrogen bonds, and the presence of carboxylates near the zinc ion or the water affect enzyme activity and inhibitor binding, but the magnitude and the detailed physical basis for the effects are unknown. This proposal seeks to quantify the effects and establish how and why the stated interactions operate. In carboxypeptidase A, the overall mechanistic path is still a matter of controversy, to say nothing of the details of the path. There is presently no ligand that forms a complex with zinc and has ligands and geometry which closely resemble those found in CPA. This proposal contains a plan to develop such a ligand. Binding studies will be used to determine the energy of inhibitor coordination to zinc in the absence of secondary interactions in the enzyme active site. Once this goal has been achieved, ligands will be prepared which quantify the contribution of some of the known active site secondary interactions. Proposed mechanisms of action of carboxypeptidase A will be tested in carefully designed model complexes. The tools used to achieve the goals of this study include molecular design and synthesis of model coordination complexes. The complexes will be characterized by x-ray crystallography, potentiometry, calorimetry, kinetic studies, and other techniques.