Acts as a negative regulator of the GCN2 kinase activity by disrupting the GCN1-GCN2 interaction in amino acid-starved cells (PubMed:19448108). Interacts with GCN1; this interaction prevents the interaction of GCN1 with GCN2 protein kinase and GCN2 activation in amino acid-starved cells (PubMed:19448108). Interacts with RBG1 (PubMed:19448108). Associates with ribosomes; the association occurs in a GCN1-dependent manner (PubMed:19448108). Present with 10300 molecules/cell in log phase SD medium. Belongs to the RWDD1/GIR2 family.