Molecular Biology and Evolution, Vol 4, 381-394, Copyright © 1987 by Society for Molecular Biology and Evolution
WM Fitch and M Bruschi
Thirty-one bacterial type ferredoxins were examined by means of the
parsimony method for their phylogenetic implications. The results show
reasonable relationships in that photosynthetic, thermophilic, and
desulfovibrio groups are identifiable; but a number of interesting
anomalies occur. These include a methanogen sequence that clusters among
the desulfovibrios. There are several differences from the phylogeny of
Woese. At least two duplications producing paralogous genes are
demonstrated, plus the probable existence of two more. The partial internal
gene duplication that doubled the length of ferredoxin is confirmed by
showing that the probability of the two ancestrally reconstructed halves
possessing that much similarity by chance is 10(- 7). Howard and co-workers
proposed that the two halves of the Azotobacter vinelandii are reversed
relative to most other sequences. A phylogeny, drawn with the halves of the
azotobacter sequence (and its relatives) reversed produced a tree that had
only three less nucleotide substitutions than did the tree without their
halves reversed. This plus other evidence suggests that the significantly
greater similarity observed across rather than within the halves is more
likely the result of convergence.
ORIGINAL ARTICLE
The evolution of prokaryotic ferredoxins--with a general method correcting for unobserved substitutions in less branched lineages
Department of Biological Sciences, University of Southern California, Los Angeles 90089-1481.
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