Abstract
Summary When carbohydrate-depleted, non-dividing cells of a chlorophyll-free mutant of Chlorella vulgaris are irradiated with blue light the activity of the mitochondrial enzyme α-ketoglutarate dehydrogenase assayed in crude cell extracts is decreased.Wavelengths around 460 nm and in the near ultraviolet are most effective.Exposures of 12-15 h at only 30 μ W cm −2 yield 20% inhibition which is half-saturation.The effect cannot be prevented by cycloheximide or by dinitrophenol; it is, however, dependent on oxygen.As time-, intensity-, and wavelength-dependencies match with those of an enhancing effect of light on the activity of pyruvate kinase of the same organism, we do not consider the inhibiting effect as artificial.We rather assume a blue light-dependent regulatory system leading to “positive” or “negative” effects on enzyme levels.
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