Inhibition of respiration in yeast by light

Helga Ninnemann*, W. L. Butler, B. L. Epel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Irradiation of starved cultures of Saccharomyces cerevisiae with blue light under aerobic conditions inhibited the capacity of the yeast cells to respire added substrates (e.g., ethanol) and stimulated endogenous respiration. Spectroscopic examination of the cells showed that the irradiation destroyed both cytochrome a and a3 components of cytochrome oxidase and a part of the cytochrome b. Irradiation under anaerobic conditions had no effect on the respiratory capacity or the cytochrome content of the cells. Under aerobic conditions cytochrome a3 was protected against photodestruction when complexed with cyanide and cytochrome a was protected when complexed with azide.

Original languageEnglish
Pages (from-to)499-506
Number of pages8
JournalBiochimica et Biophysica Acta - Bioenergetics
Issue number3
StatePublished - 30 Jun 1970
Externally publishedYes


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