Receptor-type tyrosine-protein phosphatase-like N - Q16849 (PTPRN_HUMAN)


Protein Feature View of PDB entries mapped to a UniProtKB sequence  

Plays a role in vesicle-mediated secretory processes (PubMed:24843546). Required for normal accumulation of secretory vesicles in hippocampus, pituitary and pancreatic islets (By similarity). Required for the accumulation of normal levels of insulin-containing vesicles and preventing their degradation (PubMed:24843546). Plays a role in insulin secretion in response to glucose stimuli (PubMed:24843546). Required for normal accumulation of the neurotransmitters norepinephrine, dopamine and serotonin in the brain (By similarity). In females, but not in males, required for normal accumulation and secretion of pituitary hormones, such as luteinizing hormone (LH) and follicle-stimulating hormone (FSH) (By similarity). Required to maintain normal levels of renin expression and renin release (By similarity). Seems to lack intrinsic enzyme activity (By similarity). May regulate catalytic active protein-tyrosine phosphatases such as PTPRA through dimerization (By similarity). UniProt
Pathway Maps
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Subunit Structure
Homodimer; shown for the unprocessed protein (proICA512) in the endoplasmic reticulum and resolved during protein maturation as ICA512-TMF seems to be predominantly monomeric in secretory granules; however, ICA512-CCF interacts with ICA512-TMF disrupting the ICA512-TMF:SNTB2 complex. The isolated lumenal RESP18 homology domain has been shown to form disulfide-linked homooligomers (PubMed:25561468, PubMed:18824546, PubMed:26836020). Interacts (via cytoplasmic domain) with phosphorylated SNTB2; this protects PTPRN against cleavage by CAPN1 to produce ICA512-CCF. Dephosphorylation of SNTB2 upon insulin stimulation disrupts the interaction and results in PTPRN cleavage (PubMed:11483505). Interacts with SNX19 (PubMed:16273344). ICA512-CCF interacts with PIAS4; in the nucleus (PubMed:15596545). Interacts with STAT5B (phosphorylated); down-regulated by ICA512-CCF sumoylation; ICA512-CCF prevents STAT5B dephosphorylation; ICA512-CCF mediates interaction of STAT5B with PIAS4 (PubMed:15596545, PubMed:16622421). Interacts (via RESP18 homology domain) with insulin and proinsulin (PubMed:26836020). Interacts with PTPRN2, PTPRA and PTPRE (By similarity). UniProt
The RESP18 homology domain is sufficient for targeting proICA512 to secretory granules. UniProt
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The PDB to UniProt mapping is based on the data provided by the EBI SIFTS project. See also Velankar et al., Nucleic Acids Research 33, D262-265 (2005).
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