Plays a role in endosomal protein trafficking and in targeting proteins for lysosomal degradation (PubMed:23166352). Plays a role in targeting endocytosed EGFR and ERGG3 for lysosomal degradation, and thereby helps down-regulate downstream signaling cascades (PubMed:23166352). Helps recruit the ESCRT complex components TSG101, HGS and STAM to cytoplasmic membranes (PubMed:23166352). Probably plays a role in regulating protein degradation via its interaction with NEDD4 (PubMed:15776429). May also contribute to the regulation of gene expression in the nucleus (PubMed:10200294, PubMed:15793005). Binds DNA (in vitro) and may play a synergistic role with STAT6 in the nucleus in regulating the expression of various cytokines (PubMed:15793005). May regulate the expression of numerous cytokines, such as TNF, CCL2, CCL5, CXCL1, IL1A and IL10 (PubMed:10200294, PubMed:15793005). Monomer (PubMed:27927196). Interacts with NEDD4 (PubMed:16118794, PubMed:27927196). Interacts (via PSAP motif) with TSG101, a component of the ESCRT-I complex (endosomal sorting complex required for transport I) (PubMed:16118794). Interacts with WWOX (PubMed:15064722). Interacts with STAM, a component of the ESCRT-0 complex; the interaction is direct (PubMed:23166352). Identified in a complex with STAM and HGS; within this complex, interacts directly with STAM, but not with HGS (PubMed:23166352). Interacts with STAT6 (PubMed:15793005). Associated with membranes of lysosomes, early and late endosomes (PubMed:11274176, PubMed:27927196, PubMed:27582497). Can translocate from the cytoplasm into the nucleus (PubMed:15793005). Detected at Schmidt-Lanterman incisures and in nodal regions of myelinating Schwann cells (By similarity). Ubiquitously and abundantly expressed. Expressed predominantly in the placenta, peripheral blood leukocytes, lymph nodes and spleen. Up-regulated by bacterial lipopolysaccharide (LPS) (at protein level) (PubMed:15793005). By bacterial lipopolysaccharide (LPS) and by p53/TP53 (PubMed:9305847, PubMed:10200294). In monocytes by the Bacillus Calmette-Guerin (BCG) (PubMed:11274176). The PPxY motif mediates interaction with WWOX and NEDD4. The LITAF domain is stabilized by a bound zinc ion (PubMed:27927196, PubMed:27582497). The LITAF domain contains an amphipathic helix that mediates interaction with lipid membranes (PubMed:23166352, PubMed:27927196, PubMed:27582497). It interacts specifically with phosphatidylethanolamine lipid headgroups, but not with phosphoglycerol, phosphocholine, phosphoserine or inositolhexakisphosphate (PubMed:27927196). Phosphorylated on tyrosine residues in response to EGF. The disease is caused by variants affecting the gene represented in this entry. Defects in LITAF may be involved in extramammary Paget disease (EMPD) carcinogenesis. EMPD is a cancerous disease representing about 8% of all malignant skin cancers; it usually appears in the anogenital area and can be fatal by metastasizing to internal organs when left untreated for a long time. The clinical features are usually those of eczematous eruptions with weeping and crust formation. May be due to a frameshift that creates an unconventional splicing site. Data inferred from this isoform must be interpreted with caution. Belongs to the CDIP1/LITAF family.