Absolute requirement of spermidine for growth and cell cycle progression of fission yeast (Schizosaccharomyces pombe)
AUTOR(ES)
Chattopadhyay, Manas K.
FONTE
National Academy of Sciences
RESUMO
Schizosaccharomyces pombe cells that cannot synthesize spermidine or spermine because of a deletion–insertion in the gene coding for S-adenosylmethionine decarboxylase (Δspe2) have an absolute requirement for spermidine for growth. Flow cytometry studies show that in the absence of spermidine an overall delay of the cell cycle progression occurs with some accumulation of cells in the G1 phase; as little as 10−6 M spermidine is sufficient to maintain normal cell cycle distribution and normal growth. Morphologically some of the spermidine-deprived cells become spherical at an early stage with little evidence of cell division. On further incubation in the spermidine-deprived medium, growth occurs in most of the cells, not by cell division but rather by cell elongation, with an abnormal distribution of the actin cytoskeleton, DNA (4′, 6-diamidino-2-phenylindole staining), and calcofluor-staining moieties. More prolonged incubation in the spermidine-deficient medium leads to profound morphological changes including nuclear degeneration.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=124914Documentos Relacionados
- Relationship between extracellular enzymes and cell growth during the cell cycle of the fission yeast Schizosaccharomyces pombe: acid phosphatase.
- Adenylyl cyclase is dispensable for vegetative cell growth in the fission yeast Schizosaccharomyces pombe.
- Uncontrolled septation in a cell division cycle mutant of the fission yeast Schizosaccharomyces pombe.
- Site-specific mutagenesis of cdc2+, a cell cycle control gene of the fission yeast Schizosaccharomyces pombe.
- The role of proteolysis in cell cycle progression in Schizosaccharomyces pombe.