Source: hRBCD ; ID: IPI00220991
Marked as 'Membrane associated protein'
Confidence: high (present in two of the MS resources) Search PubMed for
(RBC AND this entry)

Gene names: AP2B1 , ADTB2, CLAPB1
Protein names and data: AP2B1_HUMAN , AP-2 complex subunit beta , AP105B; Adapter-related protein complex 2 subunit beta; Adaptor protein complex AP-2 subunit beta; Beta-2-adaptin; Beta-adaptin; Clathrin assembly protein complex 2 beta large chain; Plasma membrane adaptor HA2/AP2 adaptin beta subunit Lenght: 937 a.a.
Mass: 104553 Da
fasta formatted sequence

Function: 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.
Cellular location: Cell membrane. Membrane, coated pit; Peripheral membrane protein; Cytoplasmic side. Note=AP-2 appears to be excluded from internalizing CCVs and to disengage from sites of endocytosis seconds before internalization of the nascent CCV.

Database cross-references

UniProt: P63010
Ensembl: ENST00000262325
Ensembl: ENST00000312678
Ensembl: ENST00000537622
Ensembl: ENST00000538556
Ensembl: ENST00000589344
Ensembl: ENST00000603960
Ensembl: ENST00000604032
Ensembl: ENST00000604035
Ensembl: ENST00000604623
Ensembl: ENST00000605645
MIM: 601025
neXtProt: NX_P63010
Antibodypedia: P63010 (may not find the protein thus also not any antibody)
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