DNA Replication Dynamics in Prokaryotic Systems

In prokaryotes, DNA replication initiates at a single defined origin and proceeds bidirectionally via a multiprotein replisome that unwinds the duplex and synthesises new strands. Elongation is coordinated by leading‐ and lagging‐strand polymerases, helicases and primases, and is subject to topological constraints relieved by topoisomerases. Encounters with transcription complexes or protein‐DNA barriers can stall forks, requiring accessory helicases and recombination factors to maintain progression and genome stability. Termination occurs when converging forks fuse, often within a specialised termination zone bounded by polar fork‐trap sites that prevent over‐replication. R‐loops and negative supercoiling can induce unscheduled initiation or fork collapse, linking replication dynamics to global chromosome architecture. Collectively, these processes underpin faithful chromosome duplication, influence gene dosage, and serve as targets for novel antimicrobials.

Research from Nature Portfolio

High-resolution structural studies have revealed the dynamic interface between the replicative helicase and polymerase core, showing how conformational shifts coordinate leading-strand synthesis with lagging-strand primer hand-off. Single-molecule live-cell imaging has tracked individual replication forks as they encounter transcriptional roadblocks, quantifying pause durations and identifying real-time recruitment of accessory helicases that clear stalled complexes. Comparative genomic approaches across diverse bacterial taxa have uncovered variations in origin copy number and ter-site architectures, demonstrating how different species balance fork‐trap efficiency against replication–transcription conflict.

DNA Replication Dynamics in Prokaryotic Systems publication trend

The graph below shows the total number of articles in dna replication dynamics in prokaryotic systems across all publications each year (not limited to Nature Index journals).

Technical terms

Replisome: multiprotein assembly that orchestrates DNA unwinding and synthesis at the replication fork.

Replication fork trap: chromosomal region containing polar ter sites that arrest forks in one direction to confine termination.

R-loop: RNA–DNA hybrid structure formed when nascent RNA anneals to the template DNA strand, displacing the non-template strand.

Accessory helicase: specialised motor protein that removes protein–DNA obstacles ahead of the replisome to facilitate fork progression.

Topoisomerase: enzyme that relieves DNA supercoiling and entanglements by transiently cleaving and rejoining DNA strands.

References

1. Interplay between chromosomal architecture and termination of DNA replication in bacteria. Frontiers in Microbiology (2023).
2. Replication Termination: Containing Fork Fusion-Mediated Pathologies in Escherichia coli. Genes (2016).
3. Direct removal of RNA polymerase barriers to replication by accessory replicative helicases. Nucleic Acids Research (2019).
4. Supercoiling, R-Loops, Replication and the Functions of Bacterial Type 1A Topoisomerases. Genes (2020).
5. Topoisomerases I and III inhibit R-loop formation to prevent unregulated replication in the chromosomal Ter region of Escherichia coli. PLOS Genetics (2018).
6. chi sequences switch the RecBCD helicase–nuclease complex from degradative to replicative modes during the completion of DNA replication. Journal of Biological Chemistry (2023).