Anti-Rsk1 Antibody, clone 3G5.1 clone 3G5.1, from mouse

Ribosomal protein S6 kinase alpha-1 (EC 2.7.11.1; UniProt Q15418; also known as 90 kDa ribosomal protein S6 kinase 1, MAP kinase-activated protein kinase 1a, MAPK-activated protein kinase 1a, MAPKAP kinase 1a, MAPKAPK-1a, p90-RSK 1, p90RSK1, p90S6K, Ribosomal S6 kinase 1, RSK-1, S6K-alpha-1) is encoded by the RPS6KA1 (also known as MAPKAPK1A, RSK1) gene (Gene ID 6195) in human. Ribosomal s6 kinases (RSKs) are serine/threonine kinases that play a role in mediating Mek1/2-Erk1/2 mitogen-activated protein (MAP) kinase pathway signaling events. There exist two types of RSKs, p70rsk (a.k.a. S6 Kinase or S6-H1 kinase) and p90rsk (a.k.a. MAPK-activated protein kinase). Six p90rsk-coding genes have been identified in human, RPS6KA1 (MAPKAPK1A, RSK1), RPS6KA2 (MAPKAPK1C, RSK3), RPS6KA3 (MAPKAPK1B, RSK2), RPS6KA4 (MSK2), RPS6KA5 (MSK1), and RPS6KA6 (RSK4). p90RSK1 is activated by sequential phosphorylation events, where it is first phosphorylated by Erk1/2 on the C-terminal kinase domain (CTKD) Thr573, leading to subsequent Ser380 phosphorylation in the N-terminal AGC kinase-type domain. Alternatively, Ser380 can be phosphorylated directly by MK2/3 independent of CTKD Thr573 phosphorylation.