Fig. 1.

Biophysical characteristics of membrane proteins involved in aerobic respiration and photosynthesis. The figure shows the insertion-free energy (ΔG, dG) and the length of the TMD and the following C-terminal tail for proteins involved in (A) the OXPHOS system complexes, and (B) the photosynthetic apparatus. The insertion-free energy (kcal/mol) was estimated for either the first TMD with a calculated ΔG value below zero or if no such segment was found, the most hydropohobic segment in the protein. Red dots correspond to proteins encoded by the organelle genome, and blue dots to proteins encoded by the nuclear genome. Characteristic features of proteins that are putative targets for recognition by SRP are shown in the gray area.