Citation: Qi Qige, Yang Chunfan, Xia Ye, Liu Kunhui, Su Hongmei. Photo-induced Electron Transfer between 4-Thiouracil and Tryptophan[J]. Acta Chimica Sinica, ;2019, 77(6): 515-519. doi: 10.6023/A19040149 shu

Photo-induced Electron Transfer between 4-Thiouracil and Tryptophan

Qi Qige ^a,c ,
Yang Chunfan ^b,, ,
Xia Ye ^b ,
Liu Kunhui ^b ,
Su Hongmei ^b,,

a.
Beijing National Laboratory for Molecular Science(BNLMS), Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190
b.
College of Chemistry, Beijing Normal University, Beijing 100875
c.
University of Chinese Academy of Sciences, Beijing 100049

Corresponding author: Yang Chunfan, yangchunfan@bnu.edu.cn Su Hongmei, hongmei@bnu.edu.cn
Received Date: 29 April 2019
Available Online: 22 June 2019
Fund Project: the National Natural Science Foundation of China 21727803the National Natural Science Foundation of China 21425313Project supported by the National Natural Science Foundation of China (Nos. 21425313, 21727803, 21703011)the National Natural Science Foundation of China 21703011

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RNA-protein interactions are inevitably existing in many fundamental biological processes of organisms and it is an effective method to investigate the nature of RNA-protein interactions through crosslinking induced by photoactivation. Therefore, it is of great importance to detect the crucial transient intermediates to elucidate the mechanism of photo crosslinking between RNA and proteins, which will shed light on regulating the crosslinking sites as well as the favorable cross-linked amino acids. In this research, we choose the photoactivatable ribonucleotide analog, 4-thiouracil, and the aromatic amino acid, tryptophan, as a model system to study, from which the photo crosslinking is found to be initiated by the electron transfer as the first step. By means of the nanosecond time-resolved laser flash photolysis, the key intermediates of photo-induced electron transfer from tryptophan to the triplet of 4-thiouracil, 4-thiouracil anion radical (4-TU^·-)and tryptophan cation radical (TrpH^·+) are observed, as well as the deprotonated species of tryptophan neutral radical (Trp^·). By monitoring the 4-TU triplet decay kinetics, the pseudo-first order rate constant of photo-induced electron transfer is determined to be 2.88×10⁹ L·mol^-1·s^-1 and found to be diffusion-controlled. The pH-effect on the electron transfer and proton transfer have been further examined. In addition, the driving force for electron transfer from tryptophan to 4-TU triplet is estimated using the classic Rehm-Weller empirical equation to be -0.15 eV, which means the photo-induced electron transfer process is favorable thermodynamically. These results demonstrate that photo-induced electron transfer between 4-thiouracil triplet and tryptophan is the key step, which can trigger the following proton transfer and radical coupling processes and lead to the covalent photoadducts. These studies provide a basis for mechanistic understandings of photo crosslinking between RNA and proteins in more complex system.
- photoactivatable ribonucleotide,
- photo crosslinking,
- electron transfer,
- radical intermediate,
- triplet decay kinetics
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