Abstract
Ribonuclease mitochondrial RNA processing cleaves RNAs from the mammalian mitochondrial main non-coding regulatory region, called the displacement loop. Our data demonstrate that rat cells contain a site-specific ribonuclease mitochondrial RNA processing activity. We found that this enzyme processes the rat mitochondrial displacement-loop RNA substrate at the level of the conserved sequence block 1, a result which is different from that for mouse. This finding correlates with the in-vivo transcriptional analysis of the rat displacement-loop region. Processing by homologous and heterologous ribonuclease mitochondrial RNA enzymes occurs in the same manner, suggesting a conserved mode of substrate recognition.
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