Structure and mechanism of the primosome protein DnaT-functional structures for homotrimerization, dissociation of ssDNA from the PriB·ssDNA complex, and formation of the DnaT·ssDNA complex

Saki Fujiyama, Yoshito Abe, Junya Tani, Masashi Urabe, Kenji Sato, Takahiko Aramaki, Tsutomu Katayama, Tadashi Ueda

研究成果: Contribution to journalArticle査読

9 被引用数 (Scopus)

抄録

In Escherichia coli, the primosome plays an essential role in replication restart after dissociation of replisomes at the damaged replication fork. As well as PriA and PriB, DnaT, an ssDNA-binding protein, is a key member of the primosome. In this study, limited proteolysis indicated that E. coli DnaT was composed of two domains, consistent with the results of recent studies using Klebsiella pneumonia DnaT. We also found that a specific 24-residue region (Phe42-Asp66) in the N-terminal domain (1-88) was crucial for DnaT trimerization. Moreover, we determined the structure of the DnaT C-terminal domain (89-179) by NMR spectroscopy. This domain included three α-helices and a long flexible C-terminal tail, similar to the C-terminal subdomain of the AAA+ ATPase family. The neighboring histidines, His136 and His137, at a position corresponding to the AAA+ sensor II motif, were suggested to form an ssDNA-binding site. Furthermore, we found that the acidic linker between the two domains had an activity for dissociating ssDNA from the PriB·ssDNA complexes in a manner supported by the conserved acidic residues Asp70 and Glu76. Thus, these findings provide a novel structural basis for understanding the mechanism of DnaT in exposure of ssDNA and reloading of the replicative helicase at the stalled replication fork.

本文言語英語
ページ(範囲)5356-5370
ページ数15
ジャーナルFEBS Journal
281
23
DOI
出版ステータス出版済み - 12 2014

All Science Journal Classification (ASJC) codes

  • 生化学
  • 分子生物学
  • 細胞生物学

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