A Fluorescence-Based Temperature-Jump Apparatus for Illustrating Protein Dynamics on the Millisecond Time Scale.

• Tác giả: Li-Kang Chu, Liang-Che Kung
• Ngôn ngữ: eng
• Ký hiệu phân loại: 171.8 Systems based on altruism
• Thông tin xuất bản: United States : Analytical chemistry , 2025
• Bộ sưu tập: NCBI
• ID: 679887

Tóm tắt

 A fluorescence-based temperature jump (T-jump) module was constructed to illustrate the large-domain motion of a given protein upon thermal stimulus on the millisecond time scale. The aqueous sample was readily heated by 5.0 °C in ca. 2 ms with a lasting high temperature plateau (>
 1 s) upon irradiation with the "optical Riemann sum" of the discrete infrared pulses of different energy sequences from a 1467 nm diode laser operated at 1k Hz. The temperature evolution was revealed by the time-evolved fluorescence intensity change of the dissolved tryptophan. Bovine serum albumin (BSA) and human serum albumin (HSA) were chosen as model proteins, and their fluorescence intensity evolutions were recorded at 36.6-39.9 °C upon T-jump from 35.0 °C, within the range of physiological temperatures. The observed protein dynamics of BSA was characterized with an apparent activation energy of 276 ± 23 kJ mol