Carbonic Anhydrase-II Inhibition. What are the True Enzyme–Inhibitory Properties of the Sulfamide Cognate of Topiramate?
作者:Bruce E. Maryanoff、David F. McComsey、Jung Lee、Virginia L. Smith-Swintosky、Yuanping Wang、Lisa K. Minor、Matthew J. Todd
DOI:10.1021/jm7015649
日期:2008.4.1
The marketed drug topiramate ( 1) is a moderate inhibitor of carbonicanhydrase-II (CA-II) ( K i or K d = 0.3-0.6 microM), whereas sulfamidecognate 2 is a comparatively weak inhibitor ( K i or K d = 25-650 microM). From an X-ray cocrystal structure of 2.CA-II, Winum et al. ( J. Med. Chem. 2006, 49, 7024) proposed that an adverse steric interaction between the C8 methyl group in 2 and Ala-65 of CA-II
市售的药物托吡酯(1)是中等程度的碳酸酐酶II(CA-II)抑制剂(K i或K d = 0.3-0.6 microM),而磺酰胺co酸酯2是相对较弱的抑制剂(K i或K d = 25-650 microM)。Winum等人从2.CA-II的X射线共晶体结构中得出。(J. Med。Chem。2006,49,7024)提出2的C8甲基与CA-II的Ala-65之间不利的空间相互作用是造成CA-II抑制力2降低的原因。通过合成和检查配体3来直接测试Ala-65的这种作用,该配体3中缺少令人讨厌的(pro-S或C8)甲基取代基。我们还制备并评估了相关的磺酰胺5、7和9。在CA-II中抑制试验(4-硝基苯乙酸乙酸酯),对3的K i约为300 microM,表明抑制作用非常弱,接近对2的抑制作用(4NPA,K i = 340 microM)。在CA-II结合测定(ThermoFluor)中,3的K d>