Adapter protein implicated in the regulation of a large spectrum of both general and specialized signaling pathways. Binds to a large number of partners, usually by recognition of a phosphoserine or phosphothreonine motif. Binding generally results in the modulation of the activity of the binding partner (By similarity). Positively regulates phosphorylated protein HSF1 nuclear export to the cytoplasm (PubMed:12917326). Homodimer (PubMed:17085597). Heterodimerizes with YWHAZ (PubMed:16376338). Interacts with PKA-phosphorylated AANAT (PubMed:11427721). Interacts with ABL1 (phosphorylated form); the interaction retains it in the cytoplasm (PubMed:15696159). Interacts with ARHGEF28 (By similarity). Interacts with BEX3 (By similarity). Weakly interacts with CDKN1B (PubMed:12042314). Interacts with the 'Thr-369' phosphorylated form of DAPK2 (PubMed:26047703). Interacts with DENND1A (PubMed:26055712). Interacts with GAB2 (PubMed:19172738). Interacts with phosphorylated GRB10 (PubMed:15722337). Interacts with KSR1 (PubMed:10409742). Interacts with NDEL1 (By similarity). Interacts with PI4KB, TBC1D22A and TBC1D22B (PubMed:23572552). Interacts with the phosphorylated (by AKT1) form of SRPK2 (PubMed:19592491). Interacts with TIAM2. Interacts with the 'Ser-1134' and 'Ser-1161' phosphorylated form of SOS1 (By similarity). Interacts with ZFP36 (via phosphorylated form) (By similarity). Interacts with SLITRK1 (PubMed:19640509). Interacts with HSF1 (via phosphorylated form); this interaction promotes HSF1 sequestration in the cytoplasm in a ERK-dependent manner (PubMed:12917326). Interacts with RIPOR2 isoform 2 (PubMed:25588844). Interacts with KLHL22; required for the nuclear localization of KLHL22 upon amino acid starvation (PubMed:29769719). Interacts with CRTC1 (PubMed:30611118). Interacts with CRTC2 (probably when phosphorylated at 'Ser-171') (PubMed:30611118). Interacts with CRTC3 (probably when phosphorylated at 'Ser-162' and/or 'Ser-273') (PubMed:30611118). Interacts with ATP2B1 and ATP2B3; this interaction inhibits calcium-transporting ATPase activity (PubMed:18029012). Interacts with MEFV (PubMed:27030597). (Microbial infection) Interacts with HCV core protein. Identified by mass spectrometry in melanosome fractions from stage I to stage IV. Unable to dimerize with YWHAZ. Belongs to the 14-3-3 family.