Biopolym. Cell. 2019; 35(2):107-117.
Structure and Function of Biopolymers
Unrepairable substrates of nucleotide excision repair and their application to suppress the activity of this repair system
1Popov A. A., 1Evdokimov A. N., 1Lukyanchikova N. V., 1Petruseva I. O., 1, 2Lavrik O. I.
  1. Novosibirsk Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences
    8, Akademika Lavrentieva Ave., Novosibirsk, Russian Federation, 630090
  2. Novosibirsk State University
    2, Pirogova Str., Novosibirsk, Russian Federation, 630090


In the previous studies, the DNA with the bulky Fap-dC derivative was demonstrated to be a difficult substrate for the nucleotide excision repair (NER), a system which is involved in the removal of bulky lesions from DNA. This type of compounds could be of particular interest as possible selective NER, considerably reducing the potency of DNA repair due to competitive immobilization of protein factors involved in this process. This approach can be potentially useful to increase the efficiency of chemotherapy. Aim. To identify DNA structures containing multiple bulky adducts that can efficiently inhibit the nucleotide excision repair. Methods. Enzymatic DNA synthesis, PCR, NER-competent cell extract preparation, in vitro NER assay, HPLC. Results. The conditions for the synthesis of extended DNA containing multiple unrepairable lesions were established. A wide range of DNA structures containing modified nucleotides was obtained. All modified DNAs were shown to inhibit the in vitro activity of the NER system. The DNA structure that inhibits the NER activity with the highest efficiency was selected. Conclusions. The model DNA structures effectively inhibiting the activity of NER were found. The new data obtained here can potentially be used for both basic and applied research.
Keywords: DNA repair, nucleotide excision repair, unrepairable DNA lesions, model DNA substrates


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