Figure 4.

Comparison of the abundance of proteins involved in protein synthesis and homeostasis (bin 29) and of envelope-localized proteins in maize chloroplasts, proplastids, and nucleoids. A, Distribution of different functions within bin 29, namely ribosome biogenesis, 70S ribosomes, tRNA ligases, “synthesis” (translation, elongation, and termination factors), protein folding, posttranslational modifications, protein sorting and translocation, protein assembly, and proteases. B, Distribution of different functions of envelope proteins, namely metabolite transporters, protein translocon of the inner envelope membrane (TIC) and outer envelope membrane (TOC), proteases, metabolic enzymes (mostly fatty acid/lipid synthesis), plastid division and positioning, and other proteins. The inset in B shows the abundance distribution between detected inner and outer envelope membrane proteins.