Cited by 115Photochemistry and Electron Transfer StudiesDNA Repair MechanismsProtein Structure and Dynamics

Photolyase: Dynamics and electron-transfer mechanisms of DNA repair

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Zhang, Meng, Wang, Lijuan, Zhong, Dongping·2017·Archives of Biochemistry and Biophysics

Abstract

Photolyase, a flavoenzyme containing flavin adenine dinucleotide (FAD) molecule as a catalytic cofactor, repairs UV-induced DNA damage of cyclobutane pyrimidine dimer (CPD) and pyrimidine-pyrimidone (6-4) photoproduct using blue light. The FAD cofactor, conserved in the whole protein superfamily of photolyase/cryptochromes, adopts a unique folded configuration at the active site that plays a critical functional role in DNA repair. Here, we review our comprehensive characterization of the dynamics of flavin cofactor and its repair photocycles by different classes of photolyases on the most fundamental level. Using femtosecond spectroscopy and molecular biology, significant advances have recently been made to map out the entire dynamical evolution and determine actual timescales of all the catalytic processes in photolyases. The repair of CPD reveals seven electron-transfer (ET) reactions among ten elementary steps by a cyclic ET radical mechanism through bifurcating ET pathways, a direct tunneling route mediated by the intervening adenine and a two-step hopping path bridged by the intermediate adenine from the cofactor to damaged DNA, through the conserved folded flavin at the active site. The unified, bifurcated ET mechanism elucidates the molecular origin of various repair quantum yields of different photolyases from three life kingdoms. For 6-4 photoproduct repair, a similar cyclic ET mechanism operates and a new cyclic proton transfer with a conserved histidine residue at the active site of (6-4) photolyases is revealed.

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Authors
Zhang, M., Wang, L., & Zhong, D.
Affiliations
The Ohio State University (US)
Corresponding author
Zhong, Dongping
Venue
Archives of Biochemistry and Biophysics
Publisher
Elsevier BV
Published
2017-10
Volume
632
Pages
158-174
ISSN
0003-9861 (ISSN-L)
OpenAlex
W2742166934
Cited by
115
References
116
Citations by year
2026: 11 · 2025: 11 · 2024: 19 · 2023: 16 · 2022: 21 · 2021: 13 · 2020: 11 · 2019: 8 · 2018: 4 · 2017: 1
FWCI
0.54
Type
journal article
Language
en
Open access
Locations
  • Archives of Biochemistry and Biophysics (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (GM118332)
Topics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Photochemistry and Electron Transfer Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
Keywords
photolyase, DNA repair, UV-induced DNA damage, cyclobutane pyrimidine dimers, 6-4 photoproducts, flavin adenine dinucleotide, electron transfer mechanism, photocycle, cryptochrome, proton transfer, femtosecond spectroscopy
MeSH terms
DNA Damage, Deoxyribodipyrimidine Photo-Lyase, DNA Repair, Electron Transport, Flavin-Adenine Dinucleotide, Flavoproteins, Pyrimidine Dimers, Ultraviolet Rays, Protein Folding, Catalytic Domain

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