SepIVA has a function in activating the mycobacterial divisome, which is inhibited during DNA damage.

SepIVA activates mycobacterial divisome and is inhibited during DNA damage, with its interaction with FtsQ blocked to prevent cell division under stress.

• Why it matters: Understanding how mycobacteria regulate cell division during DNA damage is crucial for insights into bacterial survival and pathogenicity, especially in Mycobacterium tuberculosis.
• What they did: Using Mycobacterium smegmatis as a model, the study examined SepIVA's role in septum initiation, its recruitment by FtsQ, and how DNA damage disrupts its interaction with FtsQ, supported by genetic and localization analyses.
• The result: Findings reveal that SepIVA promotes activation of peptidoglycan synthesis during normal growth, and its inhibition during DNA damage halts division, offering potential targets for antimicrobial strategies.