Volume 55, Issue 17 pp. 5175-5178
Communication

Characterization of the Intermediate in and Identification of the Repair Mechanism of (6-4) Photolesions by Photolyases

Dr. Shirin Faraji

Corresponding Author

Dr. Shirin Faraji

Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University Heidelberg, Im Neuenheimer Feld 205A, 69120 Heidelberg, Germany

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Prof. Dr. Dongping Zhong

Prof. Dr. Dongping Zhong

Department of Physics, Department of Chemistry and Biochemistry, and Programs of Biophysics, Chemical Physics and Biochemistry, The Ohio State University, Columbus, OH, 43210 USA

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Prof. Dr. Andreas Dreuw

Prof. Dr. Andreas Dreuw

Interdisciplinary Center for Scientific Computing, Ruprecht-Karls University Heidelberg, Im Neuenheimer Feld 205A, 69120 Heidelberg, Germany

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First published: 21 March 2016
Citations: 18

Graphical Abstract

QM/MM simulations were conducted to assign a specific molecular structure to the intermediate formed in the electron-induced repair of (6-4) photolesions (purple) detected previously in ultrafast transient absorption spectroscopy. The repair mechanism involves proton transfer from the protonated His365 to the N3′ nitrogen of the lesion along an oxetane-like transition state.

Abstract

Quantum mechanics/molecular mechanics calculations are employed to assign previously recorded experimental spectroscopic signatures of the intermediates occurring during the photo-induced repair of (6-4) photolesions by photolyases to specific molecular structures. Based on this close comparison of experiment and theory it is demonstrated that the acting repair mechanism involves proton transfer from the protonated His365 to the N3′ nitrogen of the lesion, which proceeds simultaneously with intramolecular OH transfer along an oxetane-like transition state.

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