Proteomic searches comparing two (R)-lacosamide affinity baits: An electrophilic arylisothiocyanate and a photoactivated arylazide group
作者:Ki Duk Park、James P. Stables、Rihe Liu、Harold Kohn
DOI:10.1039/c000987c
日期:——
We have advanced a novel strategy to search for lacosamide ((R)-1) targets in the brain proteome where protein binding is expected to be modest. Our approach used lacosamide agents containing “affinity bait” (AB) and “chemical reporter” (CR) units. The affinity bait moiety is designed to irreversibly react with the target, and the CR group permits protein detection and capture. In this study, we report the preparation and evaluation of (R)-N-(4-azido)benzyl 2-acetamido-3-(prop-2-ynyloxy)propionamide ((R)-3) and show that this compound exhibits potent anticonvulsant activities in the MES seizure model in rodents. We compared the utility of (R)-3 with its isostere, (R)-N-(4-isothiocyanato)benzyl 2-acetamido-3-(prop-2-ynyloxy)propionamide ((R)-2), in proteomic studies designed to identify potential (R)-1 targets. We showed that despite the two-fold improved anticonvulsant activity of (R)-3 compared with (R)-2, (R)-2 was superior in revealing potential binding targets in the mouse brain soluble proteome. The difference in these agents’ utility has been attributed to the reactivity of the affinity baits (i.e., (R)-2: aryl isothiocyanate moiety; (R)-3: photoactivated aryl azide intermediates) in the irreversible protein modification step, and we conclude that this factor is a critical determinant of successful target detection where ligand (drug) binding is modest. The utility of (R)-2 and (R)-3 in in situ proteome studies is explored.
我们提出了一种新颖的策略,在蛋白质结合度较低的大脑蛋白质组中寻找拉科酰胺((R)-1)靶标。我们的方法使用了含有 "亲和诱饵"(AB)和 "化学报告"(CR)单元的拉科酰胺制剂。亲和诱饵分子被设计成与靶标发生不可逆反应,而 CR 基团则允许蛋白质检测和捕获。在这项研究中,我们报告了 (R)-N-(4-azido)benzyl 2-acetamido-3-(prop-2-ynyloxy)propionamide ((R)-3)的制备和评估,结果表明这种化合物在啮齿动物的 MES 癫痫模型中表现出强效抗惊厥活性。我们比较了(R)-3 和它的同系物(R)-N-(4-异硫氰基)苄基 2-乙酰氨基-3-(丙-2-炔氧基)丙酰胺((R)-2)在蛋白质组学研究中的作用,这些研究旨在确定潜在的(R)-1 靶点。我们发现,尽管(R)-3 的抗惊厥活性比(R)-2 提高了两倍,但(R)-2 在揭示小鼠大脑可溶性蛋白质组中的潜在结合靶点方面更胜一筹。这些药剂的效用差异归因于亲和饵料(即 (R)-2:芳基异硫氰酸酯分子;(R)-3:光活化芳基叠氮中间体)在不可逆蛋白质修饰步骤中的反应性。我们探讨了 (R)-2 和 (R)-3 在原位蛋白质组研究中的用途。