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Oxygen as a factor in eukaryote evolution - Some effects of low levels of oxygen on Saccharomyces cerevisiaeA comparative study of the effects of varying levels of oxygen on some of the metabolic functions of the primitive eukaryote, Saccharomyces cerevisiae, has shown that these cells are responsive to very low levels of oxygen: the level of palmitoyl-Co A desaturase was greatly enhanced by only 0.03 vol % oxygen. Similarly, an acetyl-CoA synthetase associated predominantly with anaerobic growth was stimulated by as little as 0.1% oxygen, while an isoenzyme correlated with aerobic growth was maximally active at much higher oxygen levels (greater than 1%). Closely following this latter pattern were three mitochondrial enzymes that attained maximal activity only under atmospheric levels of oxygen.
Document ID
19800028059
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Jahnke, L. (NASA Ames Research Center Moffett Field, CA, United States)
Klein, H. P. (NASA Ames Research Center Exobiology Research Div., Moffett Field, Calif., United States)
Date Acquired
August 10, 2013
Publication Date
September 1, 1979
Publication Information
Publication: Origins of Life
Volume: 9
Subject Category
LIFE SCIENCES (GENERAL)
Distribution Limits
Public
Copyright
Other