Table 1. Posttranslational Modifications and Proteolytic Processing of Small Signaling Peptides.
| Peptide | Precursor Length (Amino Acids) | Mature Length (Amino Acids) | Posttranslational Modifications | Proteolytic Processing Enzyme(s) | Posttranslational Modification Enzyme(s) |
|---|---|---|---|---|---|
| CEP1 | 91 | 15 | Pro hydroxylation (2 residues) | ? | Prolyl-4-hydroxylase (P4H)* |
| CLV3 | 96 | 13 | Pro hydroxylation (2 residues) | ? | Prolyl-4-hydroxylase (P4H)* |
| Hyp arabinosylation (1 residue) | |||||
| PSK | ∼80 | 5 | Tyr sulfation (2 residues) | Subtilisin-like Ser protease SBT1.1 | Tyrosylprotein sulfotransferase |
| (77–87 for PSK1-5) | |||||
| PSY1 | 75 | 18 | Tyr sulfation (1 residue) | ? | Tyrosylprotein sulfotransferase |
| Pro hydroxylation (two residues) | Prolyl-4-hydroxylase (P4H)* | ||||
| Hyp arabinosylation (one residue) | |||||
| RGF1 | 116 | 13 | Tyr sulfation (one residue) | ? | Tyrosylprotein sulfotransferase |
| (79–141 for RGF2-9) | Pro hydroxylation (one residue) | Prolyl-4-hydroxylase (P4H)* | |||
| TDIF (CLE41, CLE42, CLE44) | 88–112 | 12 | Pro hydroxylation (two residues) | ? | Prolyl-4-hydroxylase (P4H)* |
| ? | ? | ? | ? | SDD1 | ? |
?, not yet identified; *, likely/predicted.