This is the conserved N-terminal domain of CReP, constitutive repressor of eIF2-alpha phosphorylation/protein phosphatase 1, catalytic subunit. It functions in the dephosphorylation of eIF2-alpha under basal conditions in the absence of stress. In response to translation inhibition, there is reduced synthesis of the labile CReP that contributes to elevated levels of eIF2-alpha phosphorylation [1]. The C-terminus, family PP1c, is shared with the apoptosis-associated protein Gadd34 and herpes simplex virus [2].

1: Inhibition of a constitutive translation initiation factor 2alpha phosphatase, CReP, promotes survival of stressed cells. Jousse C, Oyadomari S, Novoa I, Lu P, Zhang Y, Harding HP, Ron D; J Cell Biol. 2003;163:767-775. PMID:14638860

2: GCN2 phosphorylation of eIF2alpha activates NF-kappaB in response to UV irradiation. Jiang HY, Wek RC; Biochem J. 2005;385:371-380. PMID:15355306