Identification of recG genetic interactions in Escherichia coli by transposon sequencing

Bonde, Nina J.; Wood, Elizabeth A.; Myers, Kevin S.; Place, Michael; Keck, James L.; Cox, Michael M.

doi:10.1128/jb.00184-23

Title: Identification of recG genetic interactions in Escherichia coli by transposon sequencing

Journal Article · 19 December 2023 · Journal of Bacteriology

DOI: https://doi.org/10.1128/jb.00184-23 · OSTI ID:2223001

^[1]; Wood, Elizabeth A. ^[1];

^[2]; Place, Michael ^[2];

^[1];

^[1]

Univ. of Wisconsin, Madison, WI (United States)
Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States); Univ. of Wisconsin, Madison, WI (United States). Wisconsin Energy Institute

Maintaining the integrity of the genome is of utmost importance for cell division and propagation. In Escherichia coli, the RecG protein has been implicated in processing branched recombination intermediates during DNA repair processes, but the primary cellular role(s) of RecG and the repair pathways in which it acts have been difficult to define. To gain additional insight into RecG function, we employed transposon sequencing to identify recG genetic interactions and reveal complementary or redundant functions. The strongest hits from the screen were the dam, uvrD, rnhA, radA, and rep genes. The conditional importance of these five genes in cells lacking recG was confirmed using a plasmid-based assay, revealing synthetic lethal interactions for most double deletion strains. Several of the synthetic lethal gene combinations (with uvrD, rep, and radA, but not rnhA or dam) were suppressed by deletion of recF or recO, indicating that their genetic relationships involved roles in post-replication gap repair. Additionally, loss of the RecG/SSB interaction phenocopied a recG deletion when combined with dam, uvrD, radA, or rnhA deletions but not with rep. The results reinforce the idea of RecG as a general genome guardian. RecG has at least two functions. It plays an important role in the resolution of joint molecules behind the fork, formed during post-replication gap repair. RecG is also required to suppress genome over-replication caused by unscheduled replication initiation at R-loops, at double-strand breaks caused by dam inactivation, and during replication termination.

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Research Organization:: Great Lakes Bioenergy Research Center (GLBRC), Madison, WI (United States); Univ. of Wisconsin, Madison, WI (United States). Wisconsin Energy Institute

Sponsoring Organization:: USDOE Office of Science (SC); National Institutes of Health (NIH); National Science Foundation (NSF); USDOE

Grant/Contract Number:: SC0018409; DGE-1747503

OSTI ID:: 2223001

Alternate ID(s):: OSTI ID: 2472378

Journal Information:: Journal of Bacteriology, Vol. 205, Issue 12; ISSN 0021-9193

Publisher:: American Society for MicrobiologyCopyright Statement

Country of Publication:: United States

Language:: English

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