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- Title
YfiF, an unknown protein, affects initiation timing of chromosome replication in Escherichia coli.
- Authors
GeZi, GeZi; Liu, Rui; Du, Dongdong; Wu, Nier; Bao, Narisu; Fan, Lifei; Morigen, Morigen
- Abstract
The Escherichia coli YfiF protein is functionally unknown, being predicted as a transfer RNA/ribosomal RNA (tRNA/rRNA) methyltransferase. We find that absence of the yfiF gene delays initiation of chromosome replication and the delay is reversed by ectopic expression of YfiF, whereas excess YfiF causes an early initiation. A slight decrease in both cell size and number of origin per mass is observed in ΔyfiF cells. YfiF does not genetically interact with replication proteins such as DnaA, DnaB, and DnaC. Interestingly, YfiF is associated with ribosome modulation factor (RMF), hibernation promotion factor (HPF), and the tRNA methyltransferase TrmL. Defects in replication initiation of Δrmf, Δhpf, and ΔtrmL can be rescued by overexpression of YfiF, indicating that YfiF is functionally identical to RMF, HPF, and TrmL in terms of replication initiation. Also, YfiF interacts with the rRNA methyltransferase RsmC. Moreover, the total amount of proteins and DnaA content per cell decreases or increases in the absence of YfiF or the presence of excess YfiF. These facts suggest that YfiF is a ribosomal dormancy‐like factor, affecting ribosome function. Thus, we propose that YfiF is involved in the correct timing of chromosome replication by changing the DnaA content per cell as a result of affecting ribosome function.
- Subjects
CHROMOSOME replication; ESCHERICHIA coli; RIBOSOMAL RNA; RIBOSOMAL proteins; PROTEINS; CELL size; TRANSFER RNA; HIBERNATION
- Publication
Journal of Basic Microbiology, 2021, Vol 61, Issue 10, p883
- ISSN
0233-111X
- Publication type
Article
- DOI
10.1002/jobm.202100265