The POLD3 subunit of DNA polymerase delta can promote translesion synthesis independently of DNA polymerase zeta
書誌事項
- タイトル別名
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- The POLD3 subunit of DNA polymerase δ can promote translesion synthesis independently of DNA polymerase ζ
- The POLD3 subunit of DNA polymerase can promote translesion synthesis independently of DNA polymerase
抄録
The replicative DNA polymerase Polδ consists of a catalytic subunit POLD1/p125 and three regulatory subunits POLD2/p50, POLD3/p66 and POLD4/p12. The ortholog of POLD3 in Saccharomyces cerevisiae, Pol32, is required for a significant proportion of spontaneous and UV-induced mutagenesis through its additional role in translesion synthesis (TLS) as a subunit of DNA polymerase ζ. Remarkably, chicken DT40 B lymphocytes deficient in POLD3 are viable and able to replicate undamaged genomic DNA with normal kinetics. Like its counterpart in yeast, POLD3 is required for fully effective TLS, its loss resulting in hypersensitivity to a variety of DNA damaging agents, a diminished ability to maintain replication fork progression after UV irradiation and a significant decrease in abasic site-induced mutagenesis in the immunoglobulin loci. However, these defects appear to be largely independent of Polζ, suggesting that POLD3 makes a significant contribution to TLS independently of Polζ in DT40 cells. Indeed, combining polη, polζ and pold3 mutations results in synthetic lethality. Additionally, we show in vitro that POLD3 promotes extension beyond an abasic by the Polδ holoenzyme suggesting that while POLD3 is not required for normal replication, it may help Polδ to complete abasic site bypass independently of canonical TLS polymerases.
収録刊行物
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- Nucleic Acids Research
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Nucleic Acids Research 43 (3), 1671-1683, 2015-01-27
Oxford University Press
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詳細情報 詳細情報について
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- CRID
- 1050282810812452224
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- NII論文ID
- 120005825923
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- ISSN
- 13624962
- 03051048
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- HANDLE
- 2433/216285
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- 本文言語コード
- en
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- 資料種別
- journal article
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- データソース種別
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