FtsW is a dispensable cell division protein required for Z-ring stabilization during sporulation septation in Streptomyces coelicolor.
The conserved rodA and ftsW genes encode polytopic membrane proteins that are essential for bacterial cell elongation and division, respectively, and each gene is invariably linked with a cognate class B high-molecular-weight penicillin-binding protein (HMW PBP) gene. Filamentous differentiating Streptomyces coelicolor possesses four such gene pairs. Whereas rodA, although not its cognate HMW PBP gene, is essential in these bacteria, mutation of SCO5302 or SCO2607 (sfr) caused no gross changes to growth and septation. In contrast, disruption of either ftsW or the cognate ftsI gene blocked the formation of sporulation septa in aerial hyphae. The inability of spiral polymers of FtsZ to reorganize into rings in aerial hyphae of these mutants indicates an early pivotal role of an FtsW-FtsI complex in cell division. Concerted assembly of the complete divisome was unnecessary for Z-ring stabilization in aerial hyphae as ftsQ mutants were found to be blocked at a later stage in cell division, during septum closure. Complete cross wall formation occurred in vegetative hyphae in all three fts mutants, indicating that the typical bacterial divisome functions specifically during nonessential sporulation septation, providing a unique opportunity to interrogate the function and dependencies of individual components of the divisome in vivo.
Institute of Life Science, School of Medicine, Swansea University, Singleton Park, Swansea SA2 8PP, United Kingdom.
Bhavesh V
BV
Mistry
Ricardo
R
Del Sol
Chris
C
Wright
Kim
K
Findlay
Paul
P
Dyson
D019677:Artificial Gene Fusion; D001426:Bacterial Proteins / Q000378:metabolism*; D002453:Cell Cycle; D002473:Cell Wall / Q000378:metabolism / Q000648:ultrastructure; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D017353:Gene Deletion; D023061:Gene Order; D017930:Genes, Reporter; D005816:Genetic Complementation Test; D049452:Green Fluorescent Proteins / Q000235:genetics / Q000378:metabolism; D008565:Membrane Proteins / Q000378:metabolism*; D018625:Microscopy, Atomic Force; D046529:Microscopy, Electron, Transmission; D008856:Microscopy, Fluorescence; D016254:Mutagenesis, Insertional; D046915:Penicillin-Binding Proteins / Q000235:genetics; D013171:Spores, Bacterial; D048372:Streptomyces coelicolor / Q000737:chemistry / Q000502:physiology* / Q000648:ultrastructure
D001426:Bacterial Proteins; D003598:Cytoskeletal Proteins; C071525:FtsZ protein, Bacteria; D008565:Membrane Proteins; D046915:Penicillin-Binding Proteins; C485184:enhanced green fluorescent protein; C061684:FtsW protein, Bacteria; D049452:Green Fluorescent Proteins