DENN domain-containing protein 1B (DENND1B)

Guanine nucleotide exchange factor (GEF) for RAB35 that serves as a regulator of T-cell receptor (TCR) internalization in TH2 cells (PubMed:20154091, PubMed:20937701, PubMed:24520163, PubMed:26774822). Acts by encouraging the exchange of GDP to GTP, converting inactive GDP-bound RAB35 to its busy GTP-bound form (PubMed:20154091, PubMed:20937701).

Plays a role in clathrin- mediated endocytosis (PubMed:20154091). Controls cytokine production in TH2 lymphocytes by controlling the speed of TCR internalization and routing to endosomes: acts by mediating clathrin-mediated endocytosis of TCR through its interaction with the adapter protein complex 2 (AP-2) and GEF activity (PubMed:26774822).