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Suzuki T, Sassa A, Grúz P, Gupta RC, Johnson F, Adachi N, Nohmi T. Error-prone bypass patch by a low-fidelity variant of DNA polymerase zeta in human cells. DNA Repair (Amst) 2021; 100:103052. [PMID: 33607474 DOI: 10.1016/j.dnarep.2021.103052] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/16/2021] [Accepted: 01/20/2021] [Indexed: 11/15/2022]
Abstract
DNA polymerase ζ (Pol ζ) is a specialized Pol that is involved in translesion DNA synthesis (TLS), in particular, in the extension of primer DNA after bypassing DNA lesions. Previously, we established human cells that express a variant form of Pol ζ with an amino acid change of leucine 2618 to methionine (L2618M) in the catalytic subunit REV3L (DNA Repair, 45, 34-43, 2016). This amino acid change made the cells more sensitive to the mutagenicity of benzo[a]pyrene diol epoxide (BPDE). In this study, we embedded BPDE-N2-guanine at a defined position in the supF gene on the shuttle plasmid and introduced it to REV3 L2618M cells or the wild-type (WT) cells to examine how far Pol ζ L2618M extends the primer DNA after bypassing the lesion. The adduct induced primarily G to T and G to C at the adducted site in both cell lines, but generated additional sequence changes such as base substitutions, deletions and additions in the extension patch much more often in REV3 L2618M cells than in the WT cells. Mutations in the extension patch in REV3 L2618M cells occurred most often within 10 bps from the adducted site. Then, the number of mutations gradually decreased and no mutations were observed between 30 and 40 bps from the lesion. We concluded that human Pol ζ L2618M and perhaps WT Pol ζ extend the primer DNA up to approximately 30 bps from the lesion in vivo. The possibility of involvement of Pol ζ L2618M in the insertion step of TLS is discussed.
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Affiliation(s)
- Tetsuya Suzuki
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa, 210-9501, Japan.
| | - Akira Sassa
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa, 210-9501, Japan
| | - Petr Grúz
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa, 210-9501, Japan
| | - Ramesh C Gupta
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York, 11794-3400, NY, United States
| | - Francis Johnson
- Department of Pharmacological Sciences, Stony Brook University, Stony Brook, New York, 11794-3400, NY, United States
| | - Noritaka Adachi
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama, Kanagawa, 236-0027, Japan
| | - Takehiko Nohmi
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki-shi, Kanagawa, 210-9501, Japan
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Sassa A, Suzuki T, Kanemaru Y, Niimi N, Fujimoto H, Katafuchi A, Grúz P, Yasui M, Gupta RC, Johnson F, Ohta T, Honma M, Adachi N, Nohmi T. In vivo evidence that phenylalanine 171 acts as a molecular brake for translesion DNA synthesis across benzo[a]pyrene DNA adducts by human DNA polymerase κ. DNA Repair (Amst) 2014; 15:21-8. [PMID: 24461735 DOI: 10.1016/j.dnarep.2013.12.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Revised: 12/10/2013] [Accepted: 12/29/2013] [Indexed: 10/25/2022]
Abstract
Humans possess multiple specialized DNA polymerases that continue DNA replication beyond a variety of DNA lesions. DNA polymerase kappa (Pol κ) bypasses benzo[a]pyrene diolepoxide-N(2)-deoxyguanine (BPDE-N(2)-dG) DNA adducts in an almost error-free manner. In the previous work, we changed the amino acids close to the adducts in the active site and examined the bypass efficiency. The substitution of alanine for phenylalanine 171 (F171A) enhanced by 18-fold in vitro, the efficiencies of dCMP incorporation opposite (-)- and (+)-trans-anti-BPDE-N(2)-dG. In the present study, we established human cell lines that express wild-type Pol κ (POLK+/-), F171A (POLK F171A/-) or lack expression of Pol κ (POLK-/-) to examine the in vivo significance. These cell lines were generated with Nalm-6, a human pre-B acute lymphoblastic leukemia cell line, which has high efficiency for gene targeting. Mutations were analyzed with shuttle vectors having (-)- or (+)-trans-anti-BPDE-N(2)-dG in the supF gene. The frequencies of mutations were in the order of POLK-/->POLK+/->POLK F171A/- both in (-)- and (+)-trans-anti-BPDE-N(2)-dG. These results suggest that F171 may function as a molecular brake for bypass across BPDE-N(2)-dG by Pol κ and raise the possibility that the cognate substrates for Pol κ are not BP adducts in DNA but may be lesions in DNA induced by endogenous mutagens.
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Affiliation(s)
- Akira Sassa
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan; School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji-shi, Tokyo 192-0392, Japan
| | - Tetsuya Suzuki
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Yuki Kanemaru
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Naoko Niimi
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Hirofumi Fujimoto
- Division of Radiological Protection and Biology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
| | - Atsushi Katafuchi
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Petr Grúz
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Manabu Yasui
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Ramesh C Gupta
- Department of Pharmacological Sciences and Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Francis Johnson
- Department of Pharmacological Sciences and Department of Chemistry, Stony Brook University, Stony Brook, NY 11794-3400, USA
| | - Toshihiro Ohta
- School of Life Sciences, Tokyo University of Pharmacy and Life Sciences, Hachioji-shi, Tokyo 192-0392, Japan
| | - Masamitsu Honma
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan
| | - Noritaka Adachi
- Graduate School of Nanobioscience, Yokohama City University, 22-2 Seto, Kanazawa-ku, Yokohama 236-0027, Japan
| | - Takehiko Nohmi
- Division of Genetics and Mutagenesis, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158-8501, Japan.
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