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Nucleic Acids Research, 1982, Vol. 10, No. 23 7531-7542
© 1982

MOLECULAR BIOLOGY

A new RNA polymerase and in vitro transcription of the origin of replication from rat mitochondrial DNA

Katsuyuki Yaginuma, Midori Kobayashi, Masanori Taira and Katsuro Koike*

Cancer Institute, Japanese Foundation for Cancer Research Kami-Ikebukuro, Toshima-ku, Tokyo 170, Japan

*To whom requests for reprints should be addressed

Received October 13, 1982. Accepted November 9, 1982.

A new RNA polymerase was found in a rat mitochondrial extract. This enzyme showed strong template preference in vitro for the supercoiled recombinant plasmid consisting of pBR322 and the D-loop region of rat mtDNA carrying the origin of heavy-strand replication. The main products synthesized by the D-loop region were two RNAs of different sizes. Both of these products were light-strand products transcribed from the region upstream from the origin of replication. This specific transcription is discussed in relation to initiation of primer RNA synthesis for heavy-strand replication of rat mtDNA.


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