| Tissue Specificity | Ubiquitously expressed in all tissue examined. |
| Post Translational Modifications | Phosphorylation at Thr-185 by WNK kinases (WNK1, WNK2, WNK3 or WNK4) is required for activation. Autophosphorylated.promoting its activity. |
| Function | Effector serine/threonine-protein kinase component of the WNK-SPAK/OSR1 kinase cascade, which is involved in various processes, such as ion transport, response to hypertonic stress and blood pressure. Specifically recognizes and binds proteins with a RFXV motif. Acts downstream of WNK kinases (WNK1, WNK2, WNK3 or WNK4): following activation by WNK kinases, catalyzes phosphorylation of ion cotransporters, such as SLC12A1/NKCC2, SLC12A2/NKCC1, SLC12A3/NCC, SLC12A5/KCC2 or SLC12A6/KCC3, regulating their activity. Mediates regulatory volume increase in response to hyperosmotic stress by catalyzing phosphorylation of ion cotransporters SLC12A1/NKCC2, SLC12A2/NKCC1 and SLC12A6/KCC3 downstream of WNK1 and WNK3 kinases. Phosphorylation of Na-K-Cl cotransporters SLC12A2/NKCC1 and SLC12A2/NKCC1 promote their activation and ion influx.simultaneously, phosphorylation of K-Cl cotransporters SLC12A5/KCC2 and SLC12A6/KCC3 inhibit their activity, blocking ion efflux. Acts as a regulator of NaCl reabsorption in the distal nephron by mediating phosphorylation and activation of the thiazide-sensitive Na-Cl cotransporter SLC12A3/NCC in distal convoluted tubule cells of kidney downstream of WNK4. Also acts as a regulator of angiogenesis in endothelial cells downstream of WNK1. Acts as an activator of inward rectifier potassium channels KCNJ2/Kir2.1 and KCNJ4/Kir2.3 downstream of WNK1: recognizes and binds the RXFXV/I variant motif on KCNJ2/Kir2.1 and KCNJ4/Kir2.3 and regulates their localization to the cell membrane without mediating their phosphorylation. Phosphorylates RELL1, RELL2 and RELT. Phosphorylates PAK1. Phosphorylates PLSCR1 in the presence of RELT. |
| Protein Name | Serine/Threonine-Protein Kinase Osr1Oxidative Stress-Responsive 1 Protein |
| Cellular Localisation | Cytoplasm |
| Alternative Antibody Names | Anti-Serine/Threonine-Protein Kinase Osr1 antibodyAnti-Oxidative Stress-Responsive 1 Protein antibodyAnti-OXSR1 antibodyAnti-KIAA1101 antibodyAnti-OSR1 antibody |
Information sourced from Uniprot.org
