TY - JOUR
T1 - Both DNA polymerases δ and ε contact active and stalled replication forks differently
AU - Yu, Chuanhe
AU - Gan, Haiyun
AU - Zhang, Zhiguo
N1 - Publisher Copyright:
© 2017 American Society for Microbiology.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - Three DNA polymerases, polymerases α, δ, and ε (Pol α, Pol δ, and Pol ε), are responsible for eukaryotic genome duplication. When DNA replication stress is encountered, DNA synthesis stalls until the stress is ameliorated. However, it is not known whether there is a difference in the association of each polymerase with active and stalled replication forks. Here, we show that each DNA polymerase has a distinct pattern of association with active and stalled replication forks. Pol α is enriched at extending Okazaki fragments of active and stalled forks. In contrast, although Pol δ contacts the nascent lagging strands of active and stalled forks, it binds to only the matured (and not elongating) Okazaki fragments of stalled forks. Pol ε has greater contact with the nascent single-stranded DNA (ssDNA) of the leading strand on active forks than on stalled forks. We propose that the configuration of DNA polymerases at stalled forks facilitates the resumption of DNA synthesis after stress removal.
AB - Three DNA polymerases, polymerases α, δ, and ε (Pol α, Pol δ, and Pol ε), are responsible for eukaryotic genome duplication. When DNA replication stress is encountered, DNA synthesis stalls until the stress is ameliorated. However, it is not known whether there is a difference in the association of each polymerase with active and stalled replication forks. Here, we show that each DNA polymerase has a distinct pattern of association with active and stalled replication forks. Pol α is enriched at extending Okazaki fragments of active and stalled forks. In contrast, although Pol δ contacts the nascent lagging strands of active and stalled forks, it binds to only the matured (and not elongating) Okazaki fragments of stalled forks. Pol ε has greater contact with the nascent single-stranded DNA (ssDNA) of the leading strand on active forks than on stalled forks. We propose that the configuration of DNA polymerases at stalled forks facilitates the resumption of DNA synthesis after stress removal.
KW - ChIP-ssSeq
KW - DNA polymerase
KW - DNA replication
KW - Replication stress
KW - Strand-specific sequencing
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U2 - 10.1128/MCB.00190-17
DO - 10.1128/MCB.00190-17
M3 - Article
C2 - 28784720
AN - SCOPUS:85031416401
SN - 0270-7306
VL - 37
JO - Molecular and cellular biology
JF - Molecular and cellular biology
IS - 21
M1 - e00190-17
ER -