Abstract：
:Bacterial RarA is thought to play crucial roles in the cellular response to blocked replication forks. We show that lack of Bacillus subtilis RarA renders cells very sensitive to H2O2, but not to methyl methane sulfonate or 4-nitroquinoline-1-oxide. RarA is epistatic to RecA in response to DNA damage. Inactivation of rarA partially suppressed the DNA repair defect of mutants lacking translesion synthesis polymerases. RarA may contribute to error-prone DNA repair as judged by the reduced frequency of rifampicin-resistant mutants in ΔrarA and in ΔpolY1 ΔrarA cells. The absence of RarA strongly reduced the viability of dnaD23ts and dnaB37ts cells upon partial thermal inactivation, suggesting that ΔrarA cells are deficient in replication fork assembly. A ΔrarA mutation also partially reduced the viability of dnaC30ts and dnaX51ts cells and slightly improved the viability of dnaG40ts cells at semi-permissive temperature. These results suggest that RarA links re-initiation of DNA replication with repair-by-recombination by controlling the access of the replication machinery to a collapsed replication fork.
journal_name
DNA Repair (Amst)journal_title
DNA repairauthors
Romero H,Torres R,Hernández-Tamayo R,Carrasco B,Ayora S,Graumann PL,Alonso JCdoi
10.1016/j.dnarep.2019.03.010subject
Has Abstractpub_date
2019-06-01 00:00:00pages
27-36eissn
1568-7864issn
1568-7856pii
S1568-7864(18)30086-7journal_volume
78pub_type
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