中国物理B ›› 2024, Vol. 33 ›› Issue (7): 78201-078201.doi: 10.1088/1674-1056/ad3dcd
Huanjie Jiang(蒋环杰)1,2, Yanwei Wang(王艳伟)1, Jiayuan Chen(陈家媛)1,2, Dan Hu(胡丹)1,2, Hai Pan(潘海)2, Zilong Guo(郭子龙)2, and Hu Chen(陈虎)2,3,†
Huanjie Jiang(蒋环杰)1,2, Yanwei Wang(王艳伟)1, Jiayuan Chen(陈家媛)1,2, Dan Hu(胡丹)1,2, Hai Pan(潘海)2, Zilong Guo(郭子龙)2, and Hu Chen(陈虎)2,3,†
摘要: Single-molecule magnetic tweezers (MTs) have revealed multiple transition barriers along the unfolding pathway of several two-state proteins, such as GB1 and Csp. In this study, we utilized MTs to measure the force-dependent folding and unfolding rates of both protein L (PLWT) and its Y47W mutant (PLY47W) where the mutation point is not at the force-bearing $\beta$-strands. The measurements were conducted within a force range of 3-120 pN. Notably, the unfolding rates of both PLWT and PWY47W exhibit distinct force sensitivities below 50 pN and above 60 pN, implying a two-barrier free energy landscape. Both PLWT and PLY47W share the same force-dependent folding rate and the same transition barriers, but the unfolding rate of PLY47W is faster than that of PLWT. Our finding demonstrates that the residue outside of the force-bearing region will also affect the force-induced unfolding dynamics.
中图分类号: (Single molecule manipulation of proteins and other biological molecules)