De- and repolarization mechanism of flagellar morphogenesis during a bacterial cell cycle.

Abstract:

:Eukaryotic morphogenesis is seeded with the establishment and subsequent amplification of polarity cues at key times during the cell cycle, often using (cyclic) nucleotide signals. We discovered that flagellum de- and repolarization in the model prokaryote Caulobacter crescentus is precisely orchestrated through at least three spatiotemporal mechanisms integrated at TipF. We show that TipF is a cell cycle-regulated receptor for the second messenger--bis-(3'-5')-cyclic dimeric guanosine monophosphate (c-di-GMP)--that perceives and transduces this signal through the degenerate c-di-GMP phosphodiesterase (EAL) domain to nucleate polar flagellum biogenesis. Once c-di-GMP levels rise at the G1 → S transition, TipF is activated, stabilized, and polarized, enabling the recruitment of downstream effectors, including flagellar switch proteins and the PflI positioning factor, at a preselected pole harboring the TipN landmark. These c-di-GMP-dependent events are coordinated with the onset of tipF transcription in early S phase and together enable the correct establishment and robust amplification of TipF-dependent polarization early in the cell cycle. Importantly, these mechanisms also govern the timely removal of TipF at cell division coincident with the drop in c-di-GMP levels, thereby resetting the flagellar polarization state in the next cell cycle after a preprogrammed period during which motility must be suspended.

journal_name

Genes Dev

journal_title

Genes & development

authors

Davis NJ,Cohen Y,Sanselicio S,Fumeaux C,Ozaki S,Luciano J,Guerrero-Ferreira RC,Wright ER,Jenal U,Viollier PH

doi

10.1101/gad.222679.113

subject

Has Abstract

pub_date

2013-09-15 00:00:00

pages

2049-62

issue

18

eissn

0890-9369

issn

1549-5477

pii

27/18/2049

journal_volume

27

pub_type

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