A Versatile Polypeptide Platform for Integrated Recognition and Reporting: Affinity Arrays for Protein–Ligand Interaction Analysis
作者:Karin Enander、Gunnar T. Dolphin、Bo Liedberg、Ingemar Lundström、Lars Baltzer
DOI:10.1002/chem.200305391
日期:2004.5.17
A molecular platform for protein detection and quantification is reported in which recognition has been integrated with direct monitoring of target-protein binding. The platform is based on a versatile 42-residue helix-loop-helix polypeptide that dimerizes to form four-helix bundles and allows site-selective modification with recognition and reporter elements on the side chains of individually addressable
报道了用于蛋白质检测和定量的分子平台,其中识别已与直接监测靶标蛋白质结合整合在一起。该平台基于多功能的42个残基的螺旋-环-螺旋多肽,该多肽二聚形成四个螺旋束,并允许在可单独寻址的赖氨酸残基的侧链上进行识别和报道分子的位点选择性修饰。模型目标蛋白碳酸酐酶与其抑制剂苯磺酰胺之间的良好相互作用被用于概念验证。设计了亲和力阵列,其中将具有脂族或寡甘氨酸间隔基的苯磺酰胺衍生物和荧光丹磺酰基报告基团引入支架中。阵列成员对人碳酸酐酶II(HCAII)的亲和力是通过用目标蛋白滴定来确定的,并且发现其高度受间隔子的特性影响(解离常数Kd = 0.02-3 microM)。在与苯磺酰胺阵列成员之一的竞争实验中确定了HCAII对乙酰唑酰胺(Kd = 4 nM)的亲和力,以解决为新的靶蛋白结合剂筛选物质库的可能性。同样,成功地区分不同的碳酸酐酶同工酶之间的亲和力突出了执行将来的亚型表达谱分析的可能性。预计我们的