Summary
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1.
The presence of microbodies in the yellow mutant Chlorella vulgaris 211-2-11 h/20 has been demonstrated by means of electron microscopy.
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2.
A microbody preparation, obtained from the algae by cell disruption and subsequent sucrose density gradient centrifugation, contained an enzyme pattern which suggests that the microbodies from glucose-grown cells are of the peroxisomal rather than of the glyoxysomal type. No malate synthetase and no isocitrate lyase were found.
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3.
Microbodies of acetate-grown cells also did not contain isocitrate lyase or malate synthetase activities. In contrast to glucose-grown cells a supernatant fraction of acetate-grown cells exhibited low isocitrate lyase activity, but just as in the case of glucose-grown cells activity of malate synthetase was not detectable even if assayed for with a variety of methods, including the use of 14C-1-acetate.
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4.
In acetate-grown cells malate was the major product of acetate assimilation as evidenced by the characterization of short-term products of 14C-acetate assimilation. Malate was not a primary product of 14C-acetate assimilation in glucose-grown cells.
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5.
Since on the one hand the presence of malate synthetase could not be demonstrated in acetate-grown cells as well as in glucose-grown cells, on the other hand malate was the primary product of 14C-acetate assimilation in acetate-grown cells it must be concluded, either that the enzyme is so sensitive that it does not survive isolation, or that the mutant utilizes a pathway other than the glyoxylate by-pass for acetate assimilation when dependent upon acetate for growth.
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6.
As previously demonstrated (Codd et. al., 1972) the isolated microbodies from glucose-grown cells contain high amounts of catalase. An attempt to localize catalase cytochemically by the diaminobenzidine technique failed: diaminobenzidine plus H2O2 stained the microbodies, the mitochondria, Golgi apparatus, and even the lamellar system of the chlorophyll-free plastid. Staining of both the microbodies and mitochondria was relieved by aminotriazole.
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Abbreviations
- Aminotriazole:
-
3-amino-1 H-1,2,4-triazole
- DAB:
-
3,3-diaminobenzidine
- DTNB:
-
5,5′-dithiobis-(2-nitrobenzoic acid)
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Codd, G.A., Schmid, G.H. & Kowallik, W. Further enzymic studies and electron microscopy of the microbodies of a mutant of Chlorella vulgaris . Archiv. Mikrobiol. 92, 21–38 (1973). https://doi.org/10.1007/BF00409508
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DOI: https://doi.org/10.1007/BF00409508