Proximity-Triggered Covalent Stabilization of Low-Affinity Protein Complexes In Vitro and In Vivo
作者:Marko Cigler、Thorsten G. Müller、Daniel Horn-Ghetko、Marie-Kristin von Wrisberg、Maximilian Fottner、Roger S. Goody、Aymelt Itzen、Matthias P. Müller、Kathrin Lang
DOI:10.1002/anie.201706927
日期:2017.12.4
low‐affinity protein complexes is challenging due to their dynamic nature. Here, we present a method to stabilize transient protein complexes in vivo by generating a covalent and conformationally flexible bridge between the interaction partners. A highly active pyrrolysyl tRNA synthetase mutant directs the incorporation of unnatural amino acids bearing bromoalkyl moieties (BrCnK) into proteins. We demonstrate
低亲和力蛋白质复合物的表征由于其动态性质而具有挑战性。在这里,我们提出了一种通过在相互作用伙伴之间产生共价和构象灵活的桥来稳定体内瞬时蛋白复合物的方法。高活性的吡咯烷基tRNA合成酶突变体指导将带有溴烷基部分(BrCnK)的非天然氨基酸掺入蛋白质中。我们首次证明了含有BrCnK的蛋白质与其结合伴侣之间的低亲和力蛋白质复合物可以在体内细菌和哺乳动物细胞中稳定化。使用这种方法,我们确定了小G蛋白与其核苷酸交换因子之间短暂的GDP结合复合物的晶体结构。