Component of the nascent polypeptide-associated complex (NAC), a dynamic component of the ribosomal exit tunnel, protecting the emerging polypeptides from interaction with other cytoplasmic proteins to ensure appropriate nascent protein targeting. The NAC complex also promotes mitochondrial protein import by enhancing productive ribosome interactions with the outer mitochondrial membrane and blocks the inappropriate interaction of ribosomes translating non-secretory nascent polypeptides with translocation sites in the membrane of the endoplasmic reticulum EGD1 may act as a transcription factor that exert a negative effect on the expression of several genes that are transcribed by RNA polymerase II. Can enhance DNA binding of the GAL4 protein activator. Part of the nascent polypeptide-associated complex (NAC), consisting of EGD2 and either EGD1 or BTT1. NAC associates with ribosomes via EGD1 or BTT1, and with the CCR4-NOT complex. Predominantly cytoplasmic, may also transiently localize to the nucleus. Ubiquitinated by the NOT4 E3 ligase and the UBC4 E2 ubiquitin conjugation enzyme. Present with 18000 molecules/cell in log phase SD medium. Belongs to the NAC-beta family.