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Fig. 2 | Genome Biology

Fig. 2

From: The economics of organellar gene loss and endosymbiotic gene transfer

Fig. 2

The minimum cost location to the cell of genes encoding an organellar localized proteins. A The minimum cost location of an organellar gene for a range of per-protein import costs, organellar genome copy numbers, and encoded protein abundance. The modeled per-residue protein import cost is shown above each plot. The gray-shaded fractions of the plots indicate the regions of parameter space where it is more energetically favorable to the cell to encode an organellar gene in the nuclear genome and import the requisite amount of protein. The green-shaded fractions of the plots indicate the regions of parameter space where it is more energetically favorable to the cell to encode the gene in the organellar genome. B The number of genes in the alphaproteobacterial (mitochondrial) genome for which it is more energetically favorable to the cell for the gene to be retained in the organellar genome. Green lines assume a per-residue protein import cost of 2 ATP per amino acid. Gray dashed lines indicate lower and upper cost bounds of 0.05 ATP and 5 ATP per residue, respectively. C As in B but for the cyanobacterial (chloroplast) genome. Gray-shaded areas on the plots are provided to indicate the organellar genome copy numbers of yeast, metazoan, and plant cells. Cp, chloroplast; Mt, mitochondrion

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