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AP-2 complex. The AP2 adaptor complex is a multimeric protein that works on the cell membrane to internalize cargo in clathrin-mediated endocytosis. [1] It is a stable complex of four adaptins which give rise to a structure that has a core domain and two appendage domains attached to the core domain by polypeptide linkers.
The clathrin triskelion is composed of three clathrin heavy chains interacting at their C-termini, each ~190 kDa heavy chain has a ~25 kDa light chain tightly bound to it. The three heavy chains provide the structural backbone of the clathrin lattice, and the three light chains are thought to regulate the formation and disassembly of a clathrin ...
Mechanism of clathrin-dependent endocytosis. Receptor-mediated endocytosis (RME), also called clathrin-mediated endocytosis, is a process by which cells absorb metabolites, hormones, proteins – and in some cases viruses – by the inward budding of the plasma membrane (invagination).
Clathrin-associated protein complexes are believed to interact with the cytoplasmic tails of membrane proteins, leading to their selection and concentration. Therefore, adaptor proteins are responsible for the recruitment of cargo molecules into a growing clathrin-coated pits. [ 2 ]
AP180 is a protein that plays an important role in clathrin-mediated endocytosis of synaptic vesicles.It is capable of simultaneously binding both membrane lipids (via an ANTH domain) and clathrin and is therefore thought to recruit clathrin to the membrane of newly invaginating vesicles.
Dynamin-dependent clathrin-independent pathways include FEME, UFE, ADBE, EGFR-NCE and IL2Rβ uptake. [10] Dynamin-independent clathrin-independent pathways include the CLIC/GEEC pathway (regulated by Graf1), [11] as well as MEND and macropinocytosis. [10] Clathrin-mediated endocytosis is the only pathway dependent on both clathrin and dynamin.
Adaptor Protein, COPI and TSET complexes. More trafficking pathways. Note, the colors are not the same as in the lead figure A rendering of a COPII tube. The early evolution of adaptor protein complexes The evolution of TSET, COPI and APs from the Last Eukaryotic Common Ancestor Production of a clathrin coated vesicle Electron microscope image of a coated vesicle.
Clathrin-independent endocytosis refers to the cellular process by which cells internalize extracellular molecules and particles through mechanisms that do not rely on the protein clathrin, playing a crucial role in diverse physiological processes such as nutrient uptake, membrane turnover, and cellular signaling.