Altered morphology produced by ftsZ expression in Corynebacterium glutamicum ATCC 13869.
Corynebacterium glutamicum is a Gram-positive bacterium that lacks the cell division FtsA protein and actin-like MreB proteins responsible for determining cylindrical cell shape. When the cell division ftsZ gene from C. glutamicum (ftsZ(Cg)) was cloned in different multicopy plasmids, the resulting constructions could not be introduced into C. glutamicum; it was assumed that elevated levels of FtsZ(Cg) result in lethality. The presence of a truncated ftsZ(Cg) and a complete ftsZ(Cg) under the control of Plac led to a fourfold reduction in the intracellular levels of FtsZ, generating aberrant cells displaying buds, branches and knots, but no filaments. A 20-fold reduction of the FtsZ level by transformation with a plasmid carrying the Escherichia coli lacI gene dramatically reduced the growth rate of C. glutamicum, and the cells were larger and club-shaped. Immunofluorescence microscopy of FtsZ(Cg) or visualization of FtsZ(Cg)-GFP in C. glutamicum revealed that most cells showed one fluorescent band, most likely a ring, at the mid-cell, and some cells showed two fluorescent bands (septa of future daughter cells). When FtsZ(Cg)-GFP was expressed from Plac, FtsZ rings at mid-cell, or spirals, were also clearly visible in the aberrant cells; however, this morphology was not entirely due to GFP but also to the reduced levels of FtsZ expressed from Plac. Localization of FtsZ at the septum is not negatively regulated by the nucleoid, and therefore the well-known occlusion mechanism seems not to operate in C. glutamicum.
Ramos
Angelina
A
Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain.
Letek
Michal
M
Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain.
Campelo
Ana Belén
AB
Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain.
Vaquera
José
J
Departamento de Biología Celular, Facultad de Biología, Universidad de León, 24071 León, Spain.
Mateos
Luis M
LM
Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain.
Gil
José A
JA
Departamento de Ecología, Genética y Microbiología, Área de Microbiología, Facultad de Biología, Universidad de León, 24071 León, Spain.
D001426:Bacterial Proteins / Q000502:physiology*; D002455:Cell Division; D048230:Corynebacterium glutamicum / Q000166:cytology* / Q000235:genetics; D003598:Cytoskeletal Proteins / Q000502:physiology*; D049452:Green Fluorescent Proteins
D001426:Bacterial Proteins; D003598:Cytoskeletal Proteins; C071525:FtsZ protein, Bacteria; D049452:Green Fluorescent Proteins