Roles of the Four DNA Polymerases of the Crenarchaeon Sulfolobus solfataricus and Accessory Proteins in DNA Replication

被引:50
|
作者
Choi, Jeong-Yun [1 ,2 ,3 ,4 ]
Eoff, Robert L. [1 ,2 ]
Pence, Matthew G. [1 ,2 ]
Wang, Jian [1 ,2 ]
Martin, Martha V. [1 ,2 ]
Kim, Eun-Jin [3 ,4 ]
Folkmann, Lindsay M. [1 ,2 ]
Guengerich, F. Peter [1 ,2 ]
机构
[1] Vanderbilt Univ, Dept Biochem, Sch Med, Nashville, TN 37232 USA
[2] Vanderbilt Univ, Sch Med, Ctr Mol Toxicol, Nashville, TN 37232 USA
[3] Sungkyunkwan Univ, Dept Mol Cell Biol, Div Pharmacol, Sch Med, Suwon 440746, Gyeonggi Do, South Korea
[4] Samsung Biomed Res Inst, Suwon 440746, Gyeonggi Do, South Korea
基金
美国国家卫生研究院;
关键词
MICROSOMAL CYTOCHROME-P-450; SLIDING-CLAMP; UV DAMAGE; FIDELITY; GENOME; BYPASS; GENE; PCNA; DPO4; P2;
D O I
10.1074/jbc.M111.258038
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
The hyperthermophilic crenarchaeon Sulfolobus solfataricus P2 encodes three B-family DNA polymerase genes, B1 (Dpo1), B2 (Dpo2), and B3 (Dpo3), and one Y-family DNA polymerase gene, Dpo4, which are related to eukaryotic counterparts. Both mRNAs and proteins of all four DNA polymerases were constitutively expressed in all growth phases. Dpo2 and Dpo3 possessed very low DNA polymerase and 3' to 5' exonuclease activities in vitro. Steady-state kinetic efficiencies (k(cat)/K-m) for correct nucleotide insertion by Dpo2 and Dpo3 were several orders of magnitude less than Dpo1 and Dpo4. Both the accessory proteins proliferating cell nuclear antigen and the clamp loader replication factor C facilitated DNA synthesis with Dpo3, as with Dpo1 and Dpo4, but very weakly with Dpo2. DNA synthesis by Dpo2 and Dpo3 was remarkably decreased by single-stranded binding protein, in contrast to Dpo1 and Dpo4. DNA synthesis in the presence of proliferating cell nuclear antigen, replication factor C, and single-stranded binding protein was most processive with Dpo1, whereas DNA lesion bypass was most effective with Dpo4. Both Dpo2 and Dpo3, but not Dpo1, bypassed hypoxanthine and 8-oxoguanine. Dpo2 and Dpo3 bypassed uracil and cis-syn cyclobutane thymine dimer, respectively. High concentrations of Dpo2 or Dpo3 did not attenuate DNA synthesis by Dpo1 or Dpo4. We conclude that Dpo2 and Dpo3 are much less functional and more thermolabile than Dpo1 and Dpo4 in vitro but have bypass activities across hypoxanthine, 8-oxoguanine, and either uracil or cis-syn cyclobutane thymine dimer, suggesting their catalytically limited roles in translesion DNA synthesis past deaminated, oxidized base lesions and/or UV-induced damage.
引用
收藏
页码:31180 / 31193
页数:14
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