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Comparative Study
. 1978 Jun;75(6):2674-8.
doi: 10.1073/pnas.75.6.2674.

Pseudomonas cytochrome c551 at 2.0 A resolution: enlargement of the cytochrome c family

R J Almassy, R E Dickerson
Comparative Study

Pseudomonas cytochrome c551 at 2.0 A resolution: enlargement of the cytochrome c family

R J Almassy et al. Proc Natl Acad Sci U S A. 1978 Jun.

Abstract

The structure of respiratory cytochrome c551 of Pseudomonas aeruginosa, with 82 amino acids, has been solved by x-ray analysis and refined to a crystallographic R factor of 16.2%. It has the same basic folding pattern and hydrophobic heme environment as cytochromes c, c2, and c550, except for a large deletion at the bottom of the heme crevice. This same "cytochrome fold" appears to be present in photosynthetic cytochromes c of green and purple sulfur bacteria, and algal cytochromes f, suggesting a common evolutionary origin for electron transport chains in photosynthesis and respiration.

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