AP2A1_HUMAN
Source: hRBCD ; ID: IPI00256684PM19886704
PM23856902
BSc_CH
PM22954596
Marked as 'Membrane associated protein'
Confidence: high (present in two of the MS resources) Search PubMed for
(RBC AND this entry)
Gene names: AP2A1 , ADTAA, CLAPA1
Protein names and data: AP2A1_HUMAN , AP-2 complex subunit alpha-1 , 100 kDa coated vesicle protein A; Adapter-related protein complex 2 subunit alpha-1; Adaptor protein complex AP-2 subunit alpha-1; Alpha-adaptin A; Alpha1-adaptin; Clathrin assembly protein complex 2 alpha-A large chain; Plasma membrane adaptor HA2/AP2 adaptin alpha A subunit Lenght: 977 a.a.
Mass: 107546 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 alpha subunit binds polyphosphoinositide-containing lipids, positioning AP-2 on the membrane. The AP-2 alpha subunit acts via its C- terminal appendage domain as a scaffolding platform for endocytic accessory proteins. The AP-2 alpha and AP-2 sigma subunits are thought to contribute to the recognition of the [ED]-X-X-X-L-[LI] motif (By similarity).
Cellular location: Cell membrane (By similarity). Membrane, coated pit; Peripheral membrane protein; Cytoplasmic side (By similarity). Note=AP-2 appears to be excluded from internalizing CCVs and to disengage from sites of endocytosis seconds before internalization of the nascent CCV (By similarity).
Tissue specificity: Isoform A expressed in forebrain, skeletal muscle, spinal cord, cerebellum, salivary gland, heart and colon. Isoform B is widely expressed in tissues and also in breast cancer and in prostate carcinoma cells.
Genetic variants
Database cross-references
UniProt: O95782Ensembl: ENST00000354293
Ensembl: ENST00000359032
MIM: 601026
neXtProt: NX_O95782
Antibodypedia: O95782 (may not find the protein thus also not any antibody)
Local full text data: click here