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. 1974 Jan;137(1):3–14. doi: 10.1042/bj1370003

The evolutionary stability of cytochrome c-551 in Pseudomonas aeruginosa and Pseudomonas fluorescens biotype C

R P Ambler 1
PMCID: PMC1166074  PMID: 4362497

Abstract

Cytochrome c-551 was prepared from nine different strains of Pseudomonas aeruginosa and six of Pseudomonas fluorescens biotype C, and their amino acid sequences were compared with the sequences previously determined for the cytochromes of type strains of each species. The standard of sequence examination was such that all single amino acid substitutions, delections or insertions ought to have been detected. Balanced double changes in sites in the same part of the sequence might have escaped detection. The standard of some of the quantitative amino acid analyses was not as high as would be required for the investigation of completely unknown sequences. Eight of the Ps. aeruginosa sequences could not be distinguished from the type sequence, whereas the ninth had a single amino acid substitution. The sequences from Ps. fluorescens biotype C were more varied, differing in from zero to four substitutions from the type sequence, with the most diverse sequences differing in seven positions. The results for Ps. aeruginosa are interpreted as evidence that neutral mutations are not responsible for much molecular evolution. The superficially paradoxical differences in the results for the two species are discussed.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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