Structures of the Catalytic Domain of Bacterial Primase DnaG in Complexes with DNA Provide Insight into Key Priming Events

Caixia Hou, Tapan Biswas, Oleg V. Tsodikov

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Bacterial primase DnaG is an essential nucleic acid polymerase that generates primers for replication of chromosomal DNA. The mechanism of DnaG remains unclear due to the paucity of structural information on DnaG in complexes with other replisome components. Here we report the first crystal structures of noncovalent DnaG-DNA complexes, obtained with the RNA polymerase domain of Mycobacterium tuberculosis DnaG and various DNA ligands. One structure, obtained with ds DNA, reveals interactions with DnaG as it slides on ds DNA and suggests how DnaG binds template for primer synthesis. In another structure, DNA in the active site of DnaG mimics the primer, providing insight into mechanisms for the nucleotide transfer and DNA translocation. In conjunction with the recent cryo-EM structure of the bacteriophage T7 replisome, this study yields a model for primer elongation and hand-off to DNA polymerase.

Original languageEnglish
Pages (from-to)2084-2093
Number of pages10
JournalBiochemistry
Volume57
Issue number14
DOIs
StatePublished - Apr 10 2018

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

ASJC Scopus subject areas

  • Biochemistry

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