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[Yeast peroxisomes, their development and operation]
Abstract:
Yeast peroxisomes (microbodies) were studied, particularly with yeast methylotrophs, using light-optical microscopy, viz. intravitam phase- and anoptral-contrast microscopy, with cytochemical as well as fixed and stained objects. The data obtained were compared with cytochemical as well as fixed and stained objects. The data obtained were compared with other evidence that we had gained on methylotrophs studied by electron microscopy and with the results obtained by investigating the peroxisomes of yeast cultures grown on nutrient containing other carbon sources. The activity of exocatalase and endocatalase, the enzymes characteristic of peroxisomes, was assayed at different growth phases of yeast methylotrophs and was found to be correlated with the cycle of development of peroxisomes. The content of biotin and inositol and its dynamics were studied in the methylotroph cells. Possible origin of peroxisomes is discussed as well as their development and the mechanism of degradation. A close contact and functional relationship have been established between peroxisomes and mitochondria.
Insights
This study investigates yeast peroxisomes in methylotrophs, revealing their development and enzyme activity correlate with cell growth. A functional link between peroxisomes and mitochondria was also established.
Area of Science:
- * Cell Biology
- * Microbiology
- * Biochemistry
Background:
- * Yeast peroxisomes (microbodies) are crucial organelles in methylotrophic yeasts.
- * Previous studies utilized electron microscopy and varied nutrient conditions.
Purpose of the Study:
- * To investigate yeast peroxisomes in methylotrophs using advanced light microscopy.
- * To correlate peroxisomal enzyme activity with cell growth phases.
- * To explore the relationship between peroxisomes and mitochondria.
Main Methods:
- * Intravitam phase- and anoptral-contrast light microscopy.
- * Cytochemical staining and fixed cell analysis.
- * Enzyme assays for exocatalase and endocatalase.
- * Analysis of biotin and inositol content.
Main Results:
- * Peroxisome development and enzyme activity (exocatalase, endocatalase) are linked to yeast methylotroph growth cycles.
- * Biotin and inositol dynamics were observed in methylotroph cells.
- * A close functional relationship was identified between peroxisomes and mitochondria.
Conclusions:
- * Yeast peroxisomes exhibit dynamic development and enzyme activity patterns.
- * Peroxisomes and mitochondria maintain a close functional interaction.
- * The study provides insights into peroxisome origin, development, and degradation.