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Nucleic Acids Research, 1994, Vol. 22, No. 8 1400-1403
© 1994

MOLECULAR BIOLOGY

Nucleotide sequence of the cox3 gene from Chondrus crispus: evidence that UGA encodes tryptophan and evolutionary implications

Catherine Boyen*, Catherine Leblanc, Geraldine Bonnard1, Jean-Michel Grienenberger1 and Bernard Kloareg

Centre d'Etudes d'Océanologie et de Biologie Marine, CNRS-UPR 4601, Université P. & M. Curie BP 74, 29682 Roscoff Cedex 1Institut de Biologie Moléculaire des Plantes, Université Louis Pasteur 12 rue du Général Zimmer, 67084 Strasbourg Cedex, France

* To whom correspondence should be addressed

Received January 24, 1994. Revised March 15, 1994. Accepted March 15, 1994.

We present the nucleotide sequence of the gene encoding subunit 3 of cytochrome c oxidase in Chondrus crispus, the first report on a mitochondrial gene from a red alga. Amino acid alignment with homologous proteins shows that tryptophan is specified by UGA, as in the mitochondrial code of most organisms other than green plants. However, phylogenetic analyses of cox3 amino acid and nucleotide sequences indicate that C.crispus COX3 is related to the green-plant mitochondrial lineage. No RNA editing was detected on the corresponding transcript. As the only known photosynthetic eukaryotes that both share an immediate mitochondrial ancestor with green plants and exhibit features characteristic of non-plant mitochondria, ie, a small-sized mitochondrial genome and a modified genetic code, rhodophytes may be thought of as an intermediate evolutionary link at the root of the green-plant mitochondrial lineage.


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