Cell Cycle Regulation and Morphogenesis in Bacteria

Bacteria coordinate DNA replication, cell growth and morphological changes via a tightly regulated cell cycle. Central to this process is a network of signalling pathways, transcription factors and proteolytic systems that ensure replication initiates once per division and that the division machinery assembles at the correct time and place. In many species, cell cycle progression is coupled to polarity and morphological differentiation, enabling asymmetric division and the formation of specialised cell types. For example, in model organisms such as Caulobacter crescentus a cascade of histidine kinases and response regulators modulates localisation of polarity factors, recruits protease complexes to defined microdomains and controls the timing of key transcriptional regulators. Nutrient availability, environmental stress and signalling molecules further integrate with core cell cycle circuits, adjusting cycle length and morphology to optimise survival. The resulting interplay between global regulatory architecture and localised assembly of divisome components underpins bacterial morphogenesis, influences population heterogeneity and informs antibiotic target discovery.

Research from Nature Portfolio

Recent studies have elucidated how phosphorylation events link polar assembly and proteolytic activity to cell cycle progression. In Caulobacter crescentus, phosphorylation of a response regulator by a histidine kinase governs its interaction with a polar scaffold protein, enabling co-recruitment of protease components and substrates to distinct cell poles. This mechanism promotes coordinated proteolysis that triggers differentiation and ensures orderly cell division. Another foundational work revealed that a nitrogen-related phosphotransferase system senses glutamine deprivation, leading to accumulation of the alarmone (p)ppGpp and extension of the G1 phase. This control of replication timing by metabolic cues underscores the integration of nutrient status with cell cycle checkpoints. In addition, ancestral zinc-finger transcriptional regulators were shown to mediate the transition from S-phase to G1 by binding conserved promoter motifs, suggesting that virulence-associated factors originally evolved to coordinate cell cycle transcription in alphaproteobacteria.

Cell Cycle Regulation and Morphogenesis in Bacteria publication trend

The graph below shows the total number of articles in cell cycle regulation and morphogenesis in bacteria across all publications each year (not limited to Nature Index journals).

Technical terms

Asymmetric division: A division event producing daughter cells with distinct sizes or fates.

Morphogenesis: The process by which cells acquire specific shapes and structures.

Phospho-signaling: Regulation of protein interactions and activity through reversible phosphorylation.

Polar microdomain: A localized region at one pole of a bacterial cell enriched in specific scaffold and regulatory proteins.

Alarmone (p)ppGpp: Signalling nucleotides that accumulate under stress or nutrient limitation to alter transcription and replication.

Cell cycle checkpoint: Control points that ensure completion of one phase before progression to the next.

References

1. Phospho-signaling couples polar asymmetry and proteolysis within a membraneless microdomain in Caulobacter crescentus. Nature Communications (2024).
2. Phosphotransferase-dependent accumulation of (p)ppGpp in response to glutamine deprivation in Caulobacter crescentus. Nature Communications (2016).
3. Cell cycle transition from S-phase to G1 in Caulobacter is mediated by ancestral virulence regulators. Nature Communications (2014).
4. Coupling of cell growth modulation to asymmetric division and cell cycle regulation in Caulobacter crescentus. Proceedings of the National Academy of Sciences of the United States of America (2024).
5. Nutritional control of bacterial DNA replication. Current Opinion in Microbiology (2023).
6. Bacterial cell differentiation enables population level survival strategies. mBio (2024).