Study of Binding Epitopes by STD-NMR Spectroscopy and Molecular Docking of Urease Inhibitors from Lichens
作者:Vinitha Moolchand Thadhani、Ajmal Khan、. Atia-tul-Wahab、Sumaira Javaid、Amsal Shafqat、. Zaheer-ul-Haq、M. Iqbal Choudhary
DOI:10.2174/1570180812666150907204007
日期:2016.3.3
responsible for the inhibition of urease enzyme at the atomic levels. STD-NMR technique revealed that aromatic moiety and methyl protons of the compound 5 are involved in interactions with the receptor protein. Since C-8 and C-10 methyl protons received the maximum saturation from the receptor protein, this indicated their close proximity to the protein. Weak STDNMR signals for lecanoric acid (8) could
评估了从罗氏菌(Roccella montagnei)和金盏花(Parmotrema cooperi)分离的地衣聚酮化合物(1-14)的脲酶抑制潜力。与标准硫脲(IC 50)相比,发现化合物5(甲基-β-蓖麻酚羧酸甲酯)是该系列中最有效的抑制剂,IC 50 = 17.4±3.0μM= 21.0±0.1μM)。SAR研究表明,与核苷,二苯醚和二苯并呋喃相比,单核聚酮化合物是更有效的抑制剂。使用饱和转移差异(STD)NMR实验来鉴定负责在原子水平上抑制脲酶的结构特征。STD-NMR技术表明,化合物5的芳族部分和甲基质子参与与受体蛋白的相互作用。由于C-8和C-10甲基质子从受体蛋白质获得最大饱和度,因此表明它们与蛋白质非常接近。Lecanoric acid(8)的STDNMR信号弱可能归因于其较大的尺寸。分子对接研究预测,这些聚酮的羧基部分充当与尿素酶双金属活性位点结合的锚。