Cytochrome a3: Destruction by Light

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Science  31 Oct 1969:
Vol. 166, Issue 3905, pp. 621-622
DOI: 10.1126/science.166.3905.621


Spectroscopic measurements on cultures of Prototheca zopfii irradiated with blue light revealed that inhibition of respiration was accompanied by destruction of cytochrome a3. One of the three b-type cytochromes and one of the two c-type cytochromes of this organism were also affected. Cytochrome oxidase of yeast (not resolved into the a and a3 components) and cytochrome a3 of beef-heart mitochondria were also destroyed by blue light.

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