Document Detail

A new morphogenesis pathway in bacteria: unbalanced activity of cell wall synthesis machineries leads to coccus-to-rod transition and filamentation in ovococci.
MedLine Citation:
PMID:  21255117     Owner:  NLM     Status:  In-Data-Review    
Bacteria display a variety of shapes, which have biological relevance. In most eubacteria, cell shape is maintained by the tough peptidoglycan (PG) layer of the cell wall, the sacculus. The organization of PG synthesis machineries, orchestrated by different cytoskeletal elements, determines the specific shapes of sacculi. In rod-shaped bacteria, the actin-like (MreB) and the tubuline-like (FtsZ) cytoskeletons control synthesis of the sidewall (elongation) and the crosswall (septation) respectively. Much less is known concerning cell morphogenesis in cocci, which lack MreB proteins. While spherical cocci exclusively display septal growth, ovococci additionally display peripheral growth, which is responsible of the slight longitudinal expansion that generates their ovoid shape. Here, we report that the ovococcus Lactococcus lactis has the ability to become rod-shaped. L. lactis IL1403 wild-type cells form long aseptate filaments during both biofilm and planktonic growth in a synthetic medium. Nascent PG insertion and the division protein FtsK localize in multiple peripheral rings regularly spaced along the filaments. We show that filamentation results from septation inhibition, and that penicillin-binding proteins PBP2x and PBP2b play a direct role in this process. We propose a model for filament formation in L. lactis, and discuss the possible biological role of such morphological differentiation.
Daniel Pérez-Núñez; Romain Briandet; Blandine David; Céline Gautier; Pierre Renault; Bernard Hallet; Pascal Hols; Rut Carballido-López; Eric Guédon
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Publication Detail:
Type:  Journal Article     Date:  2010-12-13
Journal Detail:
Title:  Molecular microbiology     Volume:  79     ISSN:  1365-2958     ISO Abbreviation:  Mol. Microbiol.     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-01-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8712028     Medline TA:  Mol Microbiol     Country:  England    
Other Details:
Languages:  eng     Pagination:  759-71     Citation Subset:  IM    
Copyright Information:
© 2010 Blackwell Publishing Ltd.
INRA, UMR1319 Micalis, Domaine de Vilvert, F-78352 Jouy-en-Josas, France. Biochimie et génétique moléculaire bactérienne, Institut des Sciences de la Vie (ISV), Université catholique de Louvain, Louvain-la-Neuve, Belgium.
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