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AP2B1
adaptor-related protein complex 2, beta 1 subunit
Component of the adaptor protein complex 2 (AP-2). Adaptor protein complexes function in protein transport via transport vesicles in different membrane traffic pathways. Adaptor protein complexes are vesicle coat components and appear to be involved in cargo selection and vesicle formation. AP-2 is involved in clathrin-dependent endocytosis in which cargo proteins are incorporated into vesicles surrounded by clathrin (clathrin-coated vesicles, CCVs) which are destined for fusion with the early endosome. The clathrin lattice serves as a mechanical scaffold but is itself unable to bind directly to membrane components. Clathrin-associated adaptor protein (AP) complexes which can bind directly to both the clathrin lattice and to the lipid and protein components of membranes are considered to be the major clathrin adaptors contributing the CCV formation. AP-2 also serves as a cargo receptor to selectively sort the membrane proteins involved in receptor-mediated endocytosis. AP-2 seems to play a role in the recycling of synaptic vesicle membranes from the presynaptic surface. AP-2 recognizes Y-X-X-[FILMV] (Y-X-X-Phi) and [ED]-X-X-X-L-[LI] endocytosis signal motifs within the cytosolic tails of transmembrane cargo molecules. AP-2 may also play a role in maintaining normal post-endocytic trafficking through the ARF6-regulated, non-clathrin pathway. The AP-2 beta subunit acts via its C-terminal appendage domain as a scaffolding platform for endocytic accessory proteins; at least some clathrin-associated sorting proteins (CLASPs) are recognized by their [DE]-X(1,2)-F-X-X-[FL]-X-X-X-R motif. The AP-2 beta subunit binds to clathrin heavy chain, promoting clathrin lattice assembly; clathrin displaces at least some CLASPs from AP2B1 which probably then can be positioned for further coat assembly.
| Gene Name: | adaptor-related protein complex 2, beta 1 subunit |
| Synonyms: | AP2B1, Adaptin, beta 2 (beta), ADTB2, AP-2 complex subunit beta, AP2-BETA, Beta-adaptin, CLAPB1, AP105B, Beta-2-adaptin |
| Target Sequences: | NM_001282 NP_001273.1 P63010 |
![AP2B1 Antibody - Immunoperoxidase of monoclonal antibody to AP2B1 on formalin-fixed paraffin-embedded human placenta. [antibody concentration 3 ug/ml]](https://lsbio-7d62.kxcdn.com/image2/ap2b1-antibody-clone-2d5-ls-c133857/53177_5189194.jpg)
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