After binding uncharged tRNA, the EIF2AK4 (GCN2) dimer trans-autophosphorylates on threonine-899, resulting in activation of the kinase domain of EIF2AK4 (Harding et al. 2000, Deng et al. 2002, Cambiaghi et al. 2014, and inferred from mouse homologs and yeast homologs).
protein serine/threonine kinase activity of tRNA:EIF2AK4:GCN1:80S Ribosome:mRNA [cytosol]
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