PIGR

This gene is a member of the immunoglobulin superfamily. The encoded poly-Ig receptor binds polymeric immunoglobulin molecules at the basolateral surface of epithelial cells; the complex is then transported across the cell to be secreted at the apical surface. A significant association was found between immunoglobulin A nephropathy and several SNPs in this gene

polymeric immunoglobulin receptor

Polymeric immunoglobulin receptor
Mediates selective transcytosis of polymeric IgA and IgM across mucosal epithelial cells. Binds polymeric IgA and IgM at the basolateral surface of epithelial cells. The complex is then transported across the cell to be secreted at the apical surface. During this process, a cleavage occurs that separates the extracellular (known as the secretory component) from the transmembrane segment.
Secretory component
Through its N-linked glycans ensures anchoring of secretory IgA (sIgA) molecules to mucus lining the epithelial surface to neutralize extracellular pathogens (PubMed:12150896).
On its own (free form) may act as a non-specific microbial scavenger to prevent pathogen interaction with epithelial cells (PubMed:16543244).

Detection of chemical stimulus involved in sensory perception of bitter tasteManual Assertion Based On ExperimentIDA:UniProtKB
Epidermal growth factor receptor signaling pathwayManual Assertion Based On ExperimentIDA:UniProtKB
Fc receptor signaling pathwayManual Assertion Based On ExperimentIDA:UniProtKB
Immunoglobulin transcytosis in epithelial cells mediated by polymeric immunoglobulin receptorManual Assertion Based On ExperimentIDA:UniProtKB
Receptor clusteringManual Assertion Based On ExperimentIDA:UniProtKB
Retina homeostasisManual Assertion Based On ExperimentHEP:UniProtKB

Polymeric immunoglobulin receptor
Cell membrane
Secretory component
Secreted

Extracellular: 19-638
Helical: 639-661
Cytoplasmic: 662-764

N-glycosylated. N-glycosylation is required for anchoring IgA molecules to mucus, but is not necessary for Ig binding.