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Nucleic Acids Research, 1984, Vol. 12, No. 19 7305-7315
© 1984

MOLECULAR BIOLOGY

Cytoctirome oxidase subunit II gene of rice has an Insertion sequence within the intron

Teh-hui Kao, Eunpyo Moon and Ray Wu

Section of Biochemistry, Molecular and Cell Biology, Cornell University Ithaca, NY 14853, USA

Received August 1, 1984. Accepted September 12, 1984.

We have isolated and sequenced the cytochrome oxidase subunit II gene from rice (Oryza sativa L. var Labelle) . The overall structural organization of this gene is very similar to that of the maize gene. This gene contains an intron in a position identical to the intron in the maize gene. However, the intron in the rice gene is longer than that of the maize gene largely due to a 461 bp insertion sequence, which has inverted repeats at its termini and is flanked by direct repeats, characteristic of transposable elements. Apart from this insertion sequence, the remainder of the intron sequence is strikingly homologous to that of maize (98.6X homology), suggesting a possible functional or structural role. The coding regions of the two genes exhibit 99.5% nucleotide sequence homology and their deduced amino acid sequences are identical. Similarly, the 3'-noncoding regions, except for several small insertions and deletions, show complete sequence homology. On the contrary, no sequence homology is detected in the 5'-noncoding regions.


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