PH Domain Leucine-Rich Repeat Protein Phosphatase (PHLPP)
In 1999, Shimuzu et al. identified a novel transcript that oscillated in a circadian-dependent manner in the rat suprachiasmatic nucleus (SCN), a bundle of neurons in the brain responsible for controlling the mammalian circadian clock (Shimizu et al. 1999). Thus, they named this gene product SCN circadian oscillatory protein (SCOP), but the function of the protein encoded by this gene was shrouded in mystery. Six years later, Newton and colleagues identified this same gene in a rational search for a serine/threonine phosphatase responsible for dephosphorylating and inactivating the pro-survival kinase, Akt (Gao et al. 2005). Upon agonist stimulation, Akt is recruited to the plasma membrane by its phosphoinositide-sensing pleckstrin homology (PH) domain, where it becomes phosphorylated by another PH domain-containing kinase, the phosphoinositide-dependent kinase-1 (PDK-1). Hypothesizing that a phosphatase that...
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