SGK3 Recombinant Protein

This gene is a member of the Ser/Thr protein kinase family and encodes a phosphoprotein with a PX (phox homology) domain. The protein phosphorylates several target proteins and has a role in neutral amino acid transport and activation of potassium and chloride channels. Alternate transcriptional splice variants, encoding different isoforms, have been characterized. [provided by RefSeq, Jul 2008]

SGK3: Serine/threonine-protein kinase which is involved in the regulation of a wide variety of ion channels, membrane transporters, cell growth, proliferation, survival and migration. Up-regulates Na(+) channels: SCNN1A/ENAC and SCN5A, K(+) channels: KCNA3/KV1.3, KCNE1, KCNQ1 and KCNH2/HERG, epithelial Ca(2+) channels: TRPV5 and TRPV6, chloride channel: BSND, creatine transporter: SLC6A8, Na(+)/dicarboxylate cotransporter: SLC13A2/NADC1, Na(+)-dependent phosphate cotransporter: SLC34A2/NAPI-2B, amino acid transporters: SLC1A5/ASCT2 and SLC6A19, glutamate transporters: SLC1A3/EAAT1, SLC1A6/EAAT4 and SLC1A7/EAAT5, glutamate receptors: GRIA1/GLUR1 and GRIK2/GLUR6, Na(+)/H(+) exchanger: SLC9A3/NHE3, and the Na(+)/K(+) ATPase. Plays a role in the regulation of renal tubular phosphate transport and bone density. Phosphorylates NEDD4L and GSK3B. Positively regulates ER transcription activity through phosphorylation of FLII. Negatively regulates the function of ITCH/AIP4 via its phosphorylation and thereby prevents CXCR4 from being efficiently sorted to lysosomes. Interacts with GSK3B and FLII. Interacts with PDPK1 in a phosphorylation-dependent manner. Induced by estrogen/ER in breast cancer cells. Expressed in most tissues with highest levels in pancreas, kidney liver, heart and brain and lower levels in lung, placenta and skeletal muscle. Expression is higher in ER- positive breast tumors than ER-negative breast tumors. Two specific sites, one in the kinase domain (Thr-320) and the other in the C-terminal regulatory region (Ser- 486), need to be phosphorylated for its full activation. Belongs to the protein kinase superfamily. AGC Ser/Thr protein kinase family. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: AGC group; EC 2.7.11.1; Kinase, protein; Protein kinase, AGC; Protein kinase, Ser/Thr (non-receptor); SGK family

Chromosomal Location of Human Ortholog: 8q13.1

Cellular Component: cytoplasmic vesicle; cytosol

Molecular Function: calcium channel regulator activity; chloride channel regulator activity; potassium channel regulator activity; protein binding; protein kinase activity; protein serine/threonine kinase activity; sodium channel regulator activity

Biological Process: peptidyl-serine phosphorylation; positive regulation of transporter activity; protein amino acid phosphorylation; regulation of apoptosis; regulation of cell growth; regulation of cell migration; regulation of cell proliferation; regulation of transcription factor activity; response to stress