RSK (p90 Ribosomal S6 Kinase)
The p90 ribosomal S6 kinase (RSK) family comprises four mammalian Ser/Thr kinases (RSK1-4) (Anjum and Blenis 2008; Carriere et al. 2008). The first RSK family member was identified as a kinase activity in maturating Xenopus laevis oocytes that phosphorylated the 40S ribosomal subunit protein S6 (rpS6) (Erikson and Maller 1985, 1986). Although the p70 ribosomal S6 kinases 1 and 2 (S6K1 and S6K2) were later shown to be the predominant S6 kinases operating in somatic cells (Blenis et al. 1991; Chung et al. 1992), RSK1 and RSK2 were found to phosphorylate rpS6 in response to MAP kinase pathway activation (Cohen et al. 2007; Roux et al. 2007). Interestingly, whereas S6K1/2 were found to phosphorylate all sites on rpS6 (Ser235, Ser236, Ser240, and Ser244), RSK1 and RSK2 were shown to specifically phosphorylate Ser235 and Ser236 (Roux et al. 2007). The role of this specific regulation is unknown, but some evidence suggests...
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