RRC ID 67113
Author Jolly SM, Gainetdinov I, Jouravleva K, Zhang H, Strittmatter L, Bailey SM, Hendricks GM, Dhabaria A, Ueberheide B, Zamore PD.
Title Thermus thermophilus Argonaute Functions in the Completion of DNA Replication.
Journal Cell
Abstract In many eukaryotes, Argonaute proteins, guided by short RNA sequences, defend cells against transposons and viruses. In the eubacterium Thermus thermophilus, the DNA-guided Argonaute TtAgo defends against transformation by DNA plasmids. Here, we report that TtAgo also participates in DNA replication. In vivo, TtAgo binds 15- to 18-nt DNA guides derived from the chromosomal region where replication terminates and associates with proteins known to act in DNA replication. When gyrase, the sole T. thermophilus type II topoisomerase, is inhibited, TtAgo allows the bacterium to finish replicating its circular genome. In contrast, loss of gyrase and TtAgo activity slows growth and produces long sausage-like filaments in which the individual bacteria are linked by DNA. Finally, wild-type T. thermophilus outcompetes an otherwise isogenic strain lacking TtAgo. We propose that the primary role of TtAgo is to help T. thermophilus disentangle the catenated circular chromosomes generated by DNA replication.
Volume 182(6)
Pages 1545-1559.e18
Published 2020-9-17
DOI 10.1016/j.cell.2020.07.036
PII S0092-8674(20)30944-2
PMID 32846159
PMC PMC7502556
MeSH Argonaute Proteins / genetics Argonaute Proteins / metabolism* Bacterial Proteins / genetics Bacterial Proteins / metabolism* Cell Survival / drug effects Cell Survival / genetics Chromosomes / metabolism Ciprofloxacin / pharmacology DNA / genetics DNA / metabolism* DNA Gyrase / metabolism* DNA Replication / drug effects DNA Replication / genetics* Endonucleases / metabolism Microscopy, Electron, Scanning Microscopy, Electron, Transmission Models, Molecular Recombinant Proteins Recombination, Genetic / drug effects Recombination, Genetic / genetics Single Molecule Imaging Tandem Mass Spectrometry Thermus thermophilus / genetics Thermus thermophilus / growth & development Thermus thermophilus / metabolism* Thermus thermophilus / ultrastructure Topoisomerase II Inhibitors / pharmacology
IF 38.637
DNA material pUC18-HTK (with promoter) (RDB03436)