Domain organization of S. alba PEP subunits determined from the structural model. Positions of chloroplast target peptide cleavage sites are indicated with black circle and line. Alternative protein name of PAP13 is FLN2; alternative of PAP14 is pTAC18; alternative of PAP15 is PRIN2. Additional sequence annotations: PAP3: a, beta''-SI3 fin binding region; b, S1 case; c, arch bridge; d, beta binding region; e, beta''-SI3 body binding region; PAP5: a, PIR1; b, PAP8 binding motif; c, rim helix binding motif; d, beta binding region; PAP7: a, alpha-CTD binding motif; beta'': a, rim helices; b, bridge helix; c, S1 case; PAP4 and PAP9: FeSOD, iron superoxide dismutase; PAP6 and PAP13: pfkB, pfkB family carbohydrate kinase domain; PAP10: TRX, thioredoxin. See also Figures S1–S3 and Tables S1–S5.
