Main properties of Lys and Arg methylproteins and methylation sites from the AT_CHLORO_Me inventory.

Protein accession, symbol and description were from TAIR, Uniprot and PPDB databases. Functional annotation was done according to MapMan bins and sub-bins [67]. Subcellular and subplastidial location was curated using data from AT_CHLORO [36], PPDB [62] and dedicated studies. The trimethylated vs. acetylated status of Lys residues was confirmed (c) or remained ambiguous (a). Modeling of 3D-structures was done using the Phyre2 server [52]. NA, not available (the protein structure could not be modeled or the model does not cover the methylation site).