ArticleNucleic acids research2022
The Caulobacter crescentus DciA promotes chromosome replication through topological loading of the DnaB replicative helicase at replication forks.
Article in Nucleic acids research, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 8 papers.
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8 citing papers in PubMed, 13 citations in OpenAlex.
- Robust helicase loading mechanism underlies diverse architectures of bacterial replication origins.Nucleic acids research · 2026Article
- Dynamic DnaA-DnaB interactions at oriC coordinate the loading and coupled translocation of two DnaB helicases for bidirectional replication.Nucleic acids research · 2026Article
- Distinct quaternary states, intermediates, and autoinhibition during loading of the DnaB-replicative helicase by the phage λP helicase loader.Nucleic acids research · 2025Article
- DnaB and DciA: mechanisms of helicase loading and translocation on ssDNA.Nucleic acids research · 2025Article
- DciA secures bidirectional replication initiation in Vibrio cholerae.Nucleic acids research · 2024Article
- Frequent nonhomologous replacement of replicative helicase loaders by viruses inProceedings of the National Academy of Sciences of the United States of America · 2024Article
- Inhibition of Replication Fork Formation and Progression: Targeting the Replication Initiation and Primosomal Proteins.International journal of molecular sciences · 2023Review
- Diverse Mechanisms of Helicase Loading during DNA Replication Initiation in Bacteria.Journal of bacteriology · 2023Review
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Authors and funding
5 authors at 1 institution in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The replicative DNA helicase translocates on single-stranded DNA to drive replication forks during chromosome replication. In most bacteria the ubiquitous replicative helicase, DnaB, co-evolved with the accessory subunit DciA, but how they function remains incompletely understood. Here, using the model bacterium Caulobacter crescentus, we demonstrate that DciA plays a prominent role in DNA replication fork maintenance. Cell cycle analyses using a synchronized Caulobacter cell population showed that cells devoid of DciA exhibit a severe delay in fork progression. Biochemical characterization revealed that the DnaB helicase in its default state forms a hexamer that inhibits self-loading onto single-stranded DNA. We found that upon binding to DciA, the DnaB hexamer undergoes conformational changes required for encircling single-stranded DNA, thereby establishing the replication fork. Further investigation of the functional structure of DciA revealed that the C-terminus of DciA includes conserved leucine residues responsible for DnaB binding and is essential for DciA in vivo functions. We propose that DciA stimulates loading of DnaB onto single strands through topological isomerization of the DnaB structure, thereby ensuring fork progression. Given that the DnaB-DciA modules are widespread among eubacterial species, our findings suggest that a common mechanism underlies chromosome replication.
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