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THE PLANT CELL, Vol 2, Issue 9 913-924, Copyright © 1990 by American Society of Plant Biologists

RESEARCH ARTICLES

Cytochrome c-553 Is not Required for Photosynthetic Activity in the Cyanobacterium Synechococcus

D. E. Laudenbach, S. K. Herbert, C. McDowell, D. C. Fork, A. R. Grossman and N. A. Straus
Carnegie Institution of Washington, Department of Plant Biology, Stanford, California 94305

In cyanobacteria, the water-soluble cytochrome c-553 functions as a mobile carrier of electrons between the membrane-bound cytochrome b6-f complex and P-700 reaction centers of Photosystem I. The structural gene for cytochrome c-553 (designated cytA) of the cyanobacterium Synechococcus sp. PCC 7942 was cloned, and the deduced amino acid sequence was shown to be similar to known cyanobacterial cytochrome c-553 proteins. A deletion mutant was constructed that had no detectable cytochrome c-553 based on spectral analyses and tetramethylbenzidine-hydrogen peroxide staining of proteins resolved by polyacrylamide gel electrophoresis. The mutant strain was not impaired in overall photosynthetic activity. However, this mutant exhibited a decreased efficiency of cytochrome f oxidation. These results indicate that cytochrome c-553 is not an absolute requirement for reducing Photosystem I reaction centers in Synechococcus sp. PCC 7942.


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D. Campbell, V. Hurry, A. K. Clarke, P. Gustafsson, and G. Oquist
Chlorophyll Fluorescence Analysis of Cyanobacterial Photosynthesis and Acclimation
Microbiol. Mol. Biol. Rev., September 1, 1998; 62(3): 667 - 683.
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