4.2 Article

Elucidating functions of DP1 and DP2 subunits from the Thermococcus kodakarensis family D DNA polymerase

期刊

EXTREMOPHILES
卷 23, 期 1, 页码 161-172

出版社

SPRINGER JAPAN KK
DOI: 10.1007/s00792-018-1070-3

关键词

Thermococcus kodakarensis; DNA polymerase; DNA replication; Archaea; Euryarchaeota

资金

  1. Ministry of Education, Culture, Sports, Science and Technology of Japan [JP21113005, JP23310152, JP26242075, JP16H01410, JP18K05442]
  2. JST PRESTO [JPMJPR12L9]

向作者/读者索取更多资源

DNA polymerase D (PolD), originally discovered in Pyrococcus furiosus, has no sequence homology with any other DNA polymerase family. Genes encoding PolD are found in most of archaea, except for those archaea in the Crenarchaeota phylum. PolD is composed of two proteins: DP1 and DP2. To date, the 3D structure of the PolD heteromeric complex is yet to be determined. In this study, we established a method that prepared highly purified PolD from Thermococcus kodakarensis, and purified DP1 and DP2 proteins formed a stable complex in solution. An intrinsically disordered region was identified in the N-terminal region of DP1, but the static light scattering analysis provided a reasonable molecular weight of DP1. In addition, PolD forms as a complex of DP1 and DP2 in a 1:1 ratio. Electron microscope single particle analysis supported this composition of PolD. Both proteins play an important role in DNA synthesis activity and in 3-5 degradation activity. DP1 has extremely low affinity for DNA, while DP2 is mainly responsible for DNA binding. Our work will provide insight and the means to further understand PolD structure and the molecular mechanism of this archaea-specific DNA polymerase.

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