Adapter or scaffold protein which participates in the assembly of numerous protein complexes and is involved in several cellular processes such as cell fate determination, cytoskeletal organization, repression of gene transcription, cell-cell adhesion, cell differentiation, proliferation and migration. Positively regulates microRNA (miRNA)-mediated gene silencing and is essential for P-body formation and integrity. Acts as a hypoxic regulator by bridging an association between the prolyl hydroxylases and VHL enabling efficient degradation of HIF1A. Acts as a transcriptional corepressor for SNAI1- and SNAI2/SLUG-dependent repression of E-cadherin transcription. Negatively regulates the Hippo signaling pathway and antagonizes phosphorylation of YAP1. Inhibits E2F-mediated transcription, and suppresses the expression of the majority of genes with E2F1-responsive elements. Regulates osteoblast development, function, differentiation and stress osteoclastogenesis. Enhances the ability of TRAF6 to activate adapter protein complex 1 (AP-1) and negatively regulates the canonical Wnt receptor signaling pathway in osteoblasts. May act as a tumor suppressor by inhibiting cell proliferation (By similarity). Interacts with SQSTM1 and RB1. Interacts with EIF4E, AGO1, AGO2, DCP2, DDX6, LATS1, LATS2, EGLN1/PHD2, EGLN2/PHD1 and EGLN3/PHD3. Interacts (via LIM zinc-binding 2) with VHL. Found in a complex composed of LIMD1, VHL, EGLN1/PHD2, ELOB and CUL2. Found in a complex with TRAF6, PRKCZ and SQSTM1. Interacts (via LIM domains) with TRAF6. Interacts (via LIM domains) with SNAI1 (via SNAG domain), SNAI2/SLUG (via SNAG domain) and SCRT1 (via SNAG domain) (By similarity). Shuttles between cytoplasm and nucleus but is localized predominantly to the cytoplasm. Found in the nucleus but not nucleoli. Colocalizes with VCL in the focal adhesions (By similarity). Phosphorylated during mitosis. Belongs to the zyxin/ajuba family.