Maintenance of the peroxisomal compartment in glucose-repressed and anaerobically grown Saccharomyces cerevisiae cells.
According to the current model of peroxisome biogenesis, the inheritance of this compartment requires the growth and division of pre-existing organelles followed by their distribution between mother and daughter cells. However, no known peroxisomal functions are present nor required for Saccharomyces cerevisiae cells grown under glucose repression and in anaerobiosis and the peroxisomal compartment becomes virtually indistinguishable under such conditions. This raised the question of the fate of this compartment in such cells. Is it maintained throughout prolonged growth under glucose repression or does it disappear from the cell and then reassemble on demand? To study the maintenance of putatively functional peroxisomes in S cerevisiae cells grown under conditions of glucose repression and anaerobiosis, we applied the vector-mediated overexpression of peroxisome matrix enzyme's catalase A and acyl-CoA oxidase. Evidence is presented that in S cerevisiae the peroxisomal import machinery responsible for targeting of matrix enzymes into this compartment is preserved under glucose repression and in the absence of oxygen.
Skoneczny
M
M
Polish Academy of Sciences, Institute of Biochemistry and Biophysics, Warsaw, Poland.
Rytka
J
J
D042962:Acyl-CoA Oxidase; D000693:Anaerobiosis; D002374:Catalase / Q000235:genetics / Q000378:metabolism; D015971:Gene Expression Regulation, Enzymologic; D005947:Glucose; D008830:Microbodies / Q000737:chemistry*; D010088:Oxidoreductases / Q000235:genetics / Q000378:metabolism; D012441:Saccharomyces cerevisiae / Q000648:ultrastructure*; D029701:Saccharomyces cerevisiae Proteins
D029701:Saccharomyces cerevisiae Proteins; D010088:Oxidoreductases; D002374:Catalase; D042962:Acyl-CoA Oxidase; C467991:POX1 protein, S cerevisiae; D005947:Glucose