Enhancer of mRNA-decapping protein 4 (EDC4, also known as Ge-1), is a regulator of mRNA decapping to function in the mRNA P-bodies within the cytoplasm. It has been shown to interact with mTORC1 [2], coenzyme A synthase [3] and MARF1 [4]. It is also involved in the regulation of immune system [5]. This is the C-terminal domain which is necessary and sufficient for P-body targeting and in plants, it also mediates DCP1 and DCP2 interaction, as well as self-association [5,6]. It adopts an helical-repeat fold similar to that of ARM/HEAT repeat proteins.

1: The C-terminal region of Ge-1 presents conserved structural features required for P-body localization. Jinek M, Eulalio A, Lingel A, Helms S, Conti E, Izaurralde E; RNA. 2008;14:1991-1998. PMID:18755833

2: Crosstalk between Edc4 and mammalian target of rapamycin complex 1 (mTORC1) signaling in mRNA decapping. Rahman H, Qasim M, Oellerich M, Asif AR; Int J Mol Sci. 2014;15:23179-23195. PMID:25514416

3: EDC4 interacts with and regulates the dephospho-CoA kinase activity of CoA synthase. Gudkova D, Panasyuk G, Nemazanyy I, Zhyvoloup A, Monteil P, Filonenko V, Gout I; FEBS Lett. 2012;586:3590-3595. PMID:22982864

4: A non-canonical role for the EDC4 decapping factor in regulating MARF1-mediated mRNA decay. Brothers WR, Hebert S, Kleinman CL, Fabian MR; Elife. 2020; [Epub ahead of print] PMID:32510323

5: Components of the Arabidopsis mRNA decapping complex are required for early seedling development. Goeres DC, Van Norman JM, Zhang W, Fauver NA, Spencer ML, Sieburth LE; Plant Cell. 2007;19:1549-1564. PMID:17513503

6: Arabidopsis DCP2, DCP1, and VARICOSE form a decapping complex required for postembryonic development. Xu J, Yang JY, Niu QW, Chua NH; Plant Cell. 2006;18:3386-3398. PMID:17158604