Cell wall growth during elongation and division: one ring to bind them?

Area of Science:

• Microbiology
• Cell Biology
• Biochemistry

Background:

• The cell division protein FtsZ is traditionally known for its role in bacterial cytokinesis, specifically in forming the division septum.
• Its function in cell wall synthesis was thought to be limited to localizing proteins at the site of septation.

Discussion:

• This study reveals an expanded role for FtsZ in bacterial cell wall (CW) synthesis beyond cell division.
• Evidence in Caulobacter crescentus demonstrates FtsZ's involvement in CW synthesis even in non-dividing cells.
• FtsZ actively recruits MurG, a crucial enzyme in peptidoglycan (PG) precursor synthesis, during cell elongation.

Key Insights:

• FtsZ mediates the incorporation of CW material at the midcell during bacterial growth (elongation).
• This FtsZ-dependent peptidoglycan synthesis activity during elongation challenges existing models of CW biogenesis in rod-shaped bacteria.
• The findings suggest a conserved mechanism of FtsZ involvement in CW synthesis across different bacterial species, as seen in E. coli.

Outlook:

• Further investigation into the precise mechanisms of FtsZ recruitment and its interaction with other CW synthesis machinery is warranted.
• Understanding this dual role of FtsZ could lead to novel strategies for developing new antibacterial therapies targeting CW synthesis.
• This research necessitates a re-evaluation of current models of bacterial CW synthesis, particularly in rod-shaped bacteria.