Chemically Reactive Immunogens Lead to Functional Convergence of the Immune Response
作者:Hagit Shulman、Carina Makarov、Anthony K. Ogawa、Floyd Romesberg、Ehud Keinan
DOI:10.1021/ja000616o
日期:2000.11.1
An aldolase antibody, 24H6, which was obtained from immunization with the large hapten 2, is shown to possess an active-site lysine residue with a perturbed pKa of 7.0. This antibody catalyzes both the aldol addition and the retrograde aldol fragmentation with a broad range of substrates that are structurally different from the hapten. This observation suggests that in reactive immunization with 1
醛缩酶抗体 24H6 是用大半抗原 2 免疫获得的,显示具有活性位点赖氨酸残基,pKa 为 7.0。该抗体使用结构上与半抗原不同的广泛底物来催化醛醇添加和逆行醛醇断裂。这一观察结果表明,在使用 1,3-二酮的反应性免疫中,半抗原结构控制化学反应,而不是活性位点的整体组织。对 38C2 和 24H6 催化的羟醛和逆羟醛反应的 Hammett 相关性研究表明,虽然这两种抗体表现出广泛的底物特异性,但它们利用的机制略有不同。虽然抗体 38C2 采用了一种让人联想到酸催化羟醛反应的机制,