Cost of Having the Largest Mitochondrial Genome: Evolutionary Mechanism of Plant Mitochondrial Genome
Figure 2
Organizational relationships between genuine mitochondrial genes and unique ORFs at the DNA (a) and polypeptide (b) levels. (a) Comparison of sugar beet atp8 and orf324. Open reading frames are boxed. Dashed lines indicate the boundaries of shared sequences. Two in-frame initiation codons (atg) are shown, of which the second is conserved among angiosperm atp8 genes. Sugar beet orf324 contains a duplicated segment of atp8 and a sequence of unknown origin. (b) Comparison of polypeptides deduced from the sugar beet atp6 and the sugar beet ccmC. The N-terminal extensions and the core regions are indicated. The putative cleavage motif is Ser-Pro-Leu. The N-terminal extension of sugar beet ccmC consists of a duplicated segment of atp9 and a sequence of unknown origin.
