抄録
DNA polymerase δ (Polδ) carries out DNA replication with extremely high accuracy. This great fidelity primarily depends on the efficient exclusion of incorrect base pairs from the active site of the polymerase domain. In addition, the 3'-5' exonuclease activity of Polδ further enhances its accuracy by eliminating misincorporated nucleotides. It is believed that these enzymatic properties also inhibit Polδ from inserting nucleotides opposite damaged templates. To test this widely accepted idea, we examined in vitro DNA synthesis by human Polδ enzymes proficient and deficient in the exonuclease activity. We chose the UV-induced lesions cyclobutyl pyrimidine dimer (CPD) and 6-4 pyrimidone photoproduct (6-4 PP) as damaged templates. 6-4 PP represents the most formidable challenge to DNA replication, and no single eukaryotic DNA polymerase has been shown to bypass 6-4 PP in vitro. Unexpectedly, we found that Polδ can perform DNA synthesis across both 6-4 PP and CPD even with a physiological concentration of deoxyribonucleotide triphosphates (dNTPs). DNA synthesis across 6-4 PP was often accompanied by a nucleotide deletion and was highly mutagenic. This unexpected enzymatic property of Polδ in the bypass of UV photoproducts challenges the received notion that the accuracy of Polδ prevents bypassing damaged templates.
| 元の言語 | 英語 |
|---|---|
| ページ（範囲） | 1228-1239 |
| ページ数 | 12 |
| ジャーナル | Genes to Cells |
| 巻 | 15 |
| 発行部数 | 12 |
| DOI | |
| 出版物ステータス | 出版済み - 12 1 2010 |
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All Science Journal Classification (ASJC) codes
- Genetics
- Cell Biology
これを引用
Human replicative DNA polymerase δ can bypass T-T (6-4) ultraviolet photoproducts on template strands. / Narita, Takeo; Tsurimoto, Toshiki; Yamamoto, Junpei; Nishihara, Kana; Ogawa, Kaori; Ohashi, Eiji; Evans, Terry; Iwai, Shigenori; Takeda, Shunichi; Hirota, Kouji.
：: Genes to Cells, 巻 15, 番号 12, 01.12.2010, p. 1228-1239.研究成果: ジャーナルへの寄稿 › 記事
}
TY - JOUR
T1 - Human replicative DNA polymerase δ can bypass T-T (6-4) ultraviolet photoproducts on template strands
AU - Narita, Takeo
AU - Tsurimoto, Toshiki
AU - Yamamoto, Junpei
AU - Nishihara, Kana
AU - Ogawa, Kaori
AU - Ohashi, Eiji
AU - Evans, Terry
AU - Iwai, Shigenori
AU - Takeda, Shunichi
AU - Hirota, Kouji
PY - 2010/12/1
Y1 - 2010/12/1
N2 - DNA polymerase δ (Polδ) carries out DNA replication with extremely high accuracy. This great fidelity primarily depends on the efficient exclusion of incorrect base pairs from the active site of the polymerase domain. In addition, the 3'-5' exonuclease activity of Polδ further enhances its accuracy by eliminating misincorporated nucleotides. It is believed that these enzymatic properties also inhibit Polδ from inserting nucleotides opposite damaged templates. To test this widely accepted idea, we examined in vitro DNA synthesis by human Polδ enzymes proficient and deficient in the exonuclease activity. We chose the UV-induced lesions cyclobutyl pyrimidine dimer (CPD) and 6-4 pyrimidone photoproduct (6-4 PP) as damaged templates. 6-4 PP represents the most formidable challenge to DNA replication, and no single eukaryotic DNA polymerase has been shown to bypass 6-4 PP in vitro. Unexpectedly, we found that Polδ can perform DNA synthesis across both 6-4 PP and CPD even with a physiological concentration of deoxyribonucleotide triphosphates (dNTPs). DNA synthesis across 6-4 PP was often accompanied by a nucleotide deletion and was highly mutagenic. This unexpected enzymatic property of Polδ in the bypass of UV photoproducts challenges the received notion that the accuracy of Polδ prevents bypassing damaged templates.
AB - DNA polymerase δ (Polδ) carries out DNA replication with extremely high accuracy. This great fidelity primarily depends on the efficient exclusion of incorrect base pairs from the active site of the polymerase domain. In addition, the 3'-5' exonuclease activity of Polδ further enhances its accuracy by eliminating misincorporated nucleotides. It is believed that these enzymatic properties also inhibit Polδ from inserting nucleotides opposite damaged templates. To test this widely accepted idea, we examined in vitro DNA synthesis by human Polδ enzymes proficient and deficient in the exonuclease activity. We chose the UV-induced lesions cyclobutyl pyrimidine dimer (CPD) and 6-4 pyrimidone photoproduct (6-4 PP) as damaged templates. 6-4 PP represents the most formidable challenge to DNA replication, and no single eukaryotic DNA polymerase has been shown to bypass 6-4 PP in vitro. Unexpectedly, we found that Polδ can perform DNA synthesis across both 6-4 PP and CPD even with a physiological concentration of deoxyribonucleotide triphosphates (dNTPs). DNA synthesis across 6-4 PP was often accompanied by a nucleotide deletion and was highly mutagenic. This unexpected enzymatic property of Polδ in the bypass of UV photoproducts challenges the received notion that the accuracy of Polδ prevents bypassing damaged templates.
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UR - http://www.scopus.com/inward/citedby.url?scp=78649714720&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2443.2010.01457.x
DO - 10.1111/j.1365-2443.2010.01457.x
M3 - Article
VL - 15
SP - 1228
EP - 1239
JO - Genes to Cells
JF - Genes to Cells
SN - 1356-9597
IS - 12
ER -