Table 1. Posttranslational Modifications and Proteolytic Processing of Small Signaling Peptides
PeptidePrecursor Length (Amino Acids)Mature Length (Amino Acids)Posttranslational ModificationsProteolytic Processing Enzyme(s)Posttranslational Modification Enzyme(s)
CEP19115Pro hydroxylation (2 residues)?Prolyl-4-hydroxylase (P4H)*
CLV39613Pro hydroxylation (2 residues)?Prolyl-4-hydroxylase (P4H)*
Hyp arabinosylation (1 residue)
PSK∼805Tyr sulfation (2 residues)Subtilisin-like Ser protease SBT1.1Tyrosylprotein sulfotransferase
(77–87 for PSK1-5)
PSY17518Tyr sulfation (1 residue)?Tyrosylprotein sulfotransferase
Pro hydroxylation (two residues)Prolyl-4-hydroxylase (P4H)*
Hyp arabinosylation (one residue)
RGF111613Tyr sulfation (one residue)?Tyrosylprotein sulfotransferase
(79–141 for RGF2-9)Pro hydroxylation (one residue)Prolyl-4-hydroxylase (P4H)*
TDIF (CLE41, CLE42, CLE44)88–11212Pro hydroxylation (two residues)?Prolyl-4-hydroxylase (P4H)*
????SDD1?
  • ?, not yet identified; *, likely/predicted.