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J. Biochem, 1987, Vol. 101, No. 4 967-976
© 1987 Japanese Biochemical Society

other

Structure and Expression of Pea Mitochondrial F1ATPase {alpha}-Subunit Gene and Its Pseudogene Involved in Homologous Recombination

Atsushi MORIKAMI and Kenzo NAKAMURA1

Laboratory of Biochemistry, Faculty of Agriculture, Nagoya University Chikusa-ku, Nagoya, Aichi 464

1To whom correspondence should be addressed.

We have characterized four pea mitochondrial DNA segments carrying the F1ATPase {alpha}-subunit coding sequences. These four types share a common 1.7-kb repeat sequence flanked by four combinations of two different left- and right-hand sequences. These results suggest that the {alpha}-subunit genes locate at the homologous recombination sites in the pea mitochondrial genome and that homologous recombination between two of these loci generates the other two types of structures. The uninterrupted {alpha}-subunit coding sequence of 1,521 bp is present in two of these loci. A rearrangement of 965 bp 3' to the ATG initiation codon generates two copies of pseudogenes where the C-terminal two-thirds of the {alpha}-subunit coding sequence is replaced with an unidentified coding frame. The other border of sequence divergence is located 733 bp upstream of the ATG initiation codon. Although multiple forms of {alpha}-subunit gene transcripts are present in mitochondria, the pseudogenes do not seem to express any {alpha}-subunit-related polypeptide.


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S. Binder, F. Hatzack, and A. Brennicke
A Novel Pea Mitochondrial in Vitro Transcription System Recognizes Homologous and Heterologous mRNA and tRNA Promoters
J. Biol. Chem., September 22, 1995; 270(38): 22182 - 22189.
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