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| Motif | Protein | Start | End | Switch Type | Switch Subtype | Switch description | Information | Evidence |
Endocytosis (KEGG - hsa04144) | ||||||||
| TRG_AP2beta_CARGO_1 | ARRB1_HUMAN | 385 | 395 | Binary | Allostery | Binding of Beta-arrestin-1 (ARRB1) to ligand-induced, phosphorylated GPCRs results in a conformational change that makes the AP2-beta interaction motif in Beta-arrestin-1 (ARRB1) accessible for binding to AP-2 complex subunit beta (AP2B1), which mediates internalization of the GPCR. | Inferred | |
Endocytosis (KEGG - mmu04144) | ||||||||
| TRG_AP2beta_CARGO_2 | PI51C_MOUSE | 633 | 644 | Binary | Pre‑translational | Alternative splicing removes the AP-2 beta-appendage-binding motif of Phosphatidylinositol 4-phosphate 5-kinase type-1 gamma (Pip5k1c), abrogating binding to AP-2 complex subunit beta (Ap2b1). With other enzymes (members of the eukaryotic diacylglycerol kinase family, and Synaptojanin-1 (Synj1)), Isoform PIPKIgamma661 of Phosphatidylinositol 4-phosphate 5-kinase type-1 gamma (Pip5k1c) (PIPKIgamma661) optimises the regional lipid environment necessary for clathrin coat formation. There are three different C-terminal splice variants of Pip5k1c: one (PIPKIgamma687) can bind selectively to Talin-1 (Tln1) via the C-terminal extension (switch details), one (PIPKIgamma661) can bind to both Talin-1 (Tln1) and AP-2 complex subunit beta (Ap2b1), and one (PIPKIgamma635) can bind to neither protein. This flexibility could impart importantly different biological functions to each isoform. For example, in humans PIP5K1C (PIPKIgamma661 in mouse) is proposed to act upstream of Rac/Rho and the differential regulation of PIP5K-gamma and -alpha might allow them to work in tandem to modulate the actin cytoskeleton during the attachment and ingestion phases of phagocytosis (See (here)). | Inferred | |
| TRG_AP2beta_CARGO_2 | PI51C_MOUSE | 633 | 644 | Binary | Physicochemical compatibility | Phosphorylation of S645 in Phosphatidylinositol 4-phosphate 5-kinase type-1 gamma (Pip5k1c) impedes binding to AP-2 complex subunit beta (Ap2b1), while dephosphorylation by calcineurin promotes binding. These phosphorylation and dephosphorylation events are important for the regulation of clathrin coat formation associated with synaptic vesicles. | Inferred | |