InterPro domain: IPR044981

This entry represents a subgroup of plant lysine-rich arabinogalactan proteins, including AGP9/17/18 from Arabidopsis. They are members of the lysine-rich arabinogalactan protein (AGP) subfamily within the hydroxyproline-rich glycoprotein (HRGP) superfamily. AGPs are hyperglycosylated proteins implicated in different aspects of plant growth and development. Protein backbones of AGPs are rich in Pro/Hyp (hydroxyproline), Ser, Ala and Thr and are modified by the addition of type II arabinogalactan polysaccharides and arabinose oligosaccharides to Hyp residues [ 1 ]. They are predicted to contain the glycosylphosphatidylinositol (GPI) anchor and are localized to the plasma membrane. AtAGP18 is involved in a signal transduction pathway regulating plant growth and development [ 2 ].

1. Expression analyses of AtAGP17 and AtAGP19, two lysine-rich arabinogalactan proteins, in Arabidopsis. Plant Biol (Stuttg) 13, 431-8
2. AtAGP18, a lysine-rich arabinogalactan protein in Arabidopsis thaliana, functions in plant growth and development as a putative co-receptor for signal transduction. Plant Signal Behav 6, 855-7