P70 S6 Kinase Beta (Phospho-Ser423) (RPS6KB2) Antibody – Rabbit

This gene encodes a member of the RSK (ribosomal S6 kinase) family of serine/threonine kinases. This kinase contains 2 nonidentical kinase catalytic domains and phosphorylates the S6 ribosomal protein and eucaryotic translation initiation factor 4B (eIF4B). Phosphorylation of S6 leads to an increase in protein synthesis and cell proliferation. [provided by RefSeq, Jul 2008]

P70S6KB: an AGC kinase of the RSK family that is required for cell growth and G1 cell cycle progression. Is phosphorylated and activated by mTOR in mitogenic pathways downstream of phosphoinositide 3 kinase (PI3K). Phosphorylates the S6 protein of the 40S ribosomal subunit and is involved in translational control of 5' oligopyrimidine tract mRNAs. Activity is controlled by multiple phosphorylation events located within the catalytic, linker and pseudosubstrate domains. Mouse knockout shows symptoms of insulin resistance, and increased insulin senstivity, resulting in protection against diet-induced obesity. Protein expression and activation upregulated in colon adenocarcinoma cell lines. Increased expression in breast cancer correlated with poor survival. Selectively amplified and overexpressed within the 17q23 breast cancer amplicon. Two isoforms produced by alternative initiation have been reported.

Protein type: Protein kinase, AGC; EC 2.7.11.1; Translation; Protein kinase, Ser/Thr (non-receptor); Kinase, protein; AGC group; RSK family; p70 subfamily

Chromosomal Location of Human Ortholog: 11q13.2

Cellular Component: nucleoplasm; cytoplasm

Molecular Function: protein serine/threonine kinase activity; ribosomal protein S6 kinase activity; peptide binding; ATP binding; protein kinase activity

Biological Process: epidermal growth factor receptor signaling pathway; positive regulation of translational initiation; fibroblast growth factor receptor signaling pathway; phosphoinositide-mediated signaling; translation; nerve growth factor receptor signaling pathway; protein kinase B signaling cascade; innate immune response; signal transduction; protein amino acid phosphorylation