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Nucleic Acids Research, 1985, Vol. 13, No. 12 4411-4416
© 1985

Articles

Sequence and codon recognition of bean mitochondria and chloroplast tRNAsTrP: evidence for a high degree of bomology

Laurence Maréchal, Pierre Guillemaut, Jean-Michel Grienenberger, Geneviéve Jeannin and Jacques-Henry Weil

Institut de Biologie Moléculaire et Cellulaire, Université Louis Pasteur 15 Rue Descartes, 67084 Strasbourg Cedex, France

Received May 21, 1985. Revised May 3, 1985. Accepted June 3, 1985.

Bean mitochondria and chloroplast tRNAsTrp, purified by RPC-5 chromatography and two-dimensional gel electrophoresis, have been sequenced using post-labeling techniques. The high degree of sequence homology between bean mitochondria and chloroplast tRNAsTrp shows that these two tRNAs are coded for by closely related genes which have probably evolved from a common ancestor gene. The anticodon of bean mitochondria tRNATrP is CmCA, which can recognize UGG (the codon for tryptophan in the universal code) and is complementary neither to UGA (which codes for tryptophan in mammalian and yeast mitochondria) nor to CGG (which could be a tryptophan codeword in plant mitochondria)


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