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Protein

AP-2 complex subunit mu

Gene

AP2M1

Organism
Bos taurus (Bovine)
Status
Reviewed-Annotation score: Annotation score: 4 out of 5-Experimental evidence at transcript leveli

Functioni

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 mu subunit binds to transmembrane cargo proteins; it recognizes the Y-X-X-Phi motifs. The surface region interacting with to the Y-X-X-Phi motif is inaccessible in cytosolic AP-2, but becomes accessible through a conformational change following phosphorylation of AP-2 mu subunit at 'Tyr-156' in membrane-associated AP-2. The membrane-specific phosphorylation event appears to involve assembled clathrin which activates the AP-2 mu kinase AAK1 (By similarity). Plays a role in endocytosis of frizzled family members upon Wnt signaling (By similarity).By similarity

Sites

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Binding sitei341 – 3411Phosphatidylinositol lipid headgroupBy similarity
Binding sitei343 – 3431Phosphatidylinositol lipid headgroupBy similarity
Binding sitei345 – 3451Phosphatidylinositol lipid headgroupBy similarity
Binding sitei354 – 3541Phosphatidylinositol lipid headgroupBy similarity
Binding sitei356 – 3561Phosphatidylinositol lipid headgroupBy similarity

GO - Molecular functioni

GO - Biological processi

Complete GO annotation...

Keywords - Biological processi

Endocytosis, Protein transport, Transport

Keywords - Ligandi

Lipid-binding

Enzyme and pathway databases

ReactomeiR-BTA-177504. Retrograde neurotrophin signalling.
R-BTA-182971. EGFR downregulation.
R-BTA-190873. Gap junction degradation.
R-BTA-196025. Formation of annular gap junctions.
R-BTA-2132295. MHC class II antigen presentation.
R-BTA-416993. Trafficking of GluR2-containing AMPA receptors.
R-BTA-437239. Recycling pathway of L1.
R-BTA-5099900. WNT5A-dependent internalization of FZD4.

Names & Taxonomyi

Protein namesi
Recommended name:
AP-2 complex subunit mu
Alternative name(s):
AP-2 mu chain
Adaptor protein complex AP-2 subunit mu
Adaptor-related protein complex 2 subunit mu
Clathrin assembly protein complex 2 mu medium chain
Clathrin coat assembly protein AP50
Clathrin coat-associated protein AP50
HA2 50 kDa subunit
Mu2-adaptin
Plasma membrane adaptor AP-2 50 kDa protein
Gene namesi
Name:AP2M1
OrganismiBos taurus (Bovine)
Taxonomic identifieri9913 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaLaurasiatheriaCetartiodactylaRuminantiaPecoraBovidaeBovinaeBos
Proteomesi
  • UP000009136 Componenti: Chromosome 1

Subcellular locationi

GO - Cellular componenti

Complete GO annotation...

Keywords - Cellular componenti

Cell membrane, Coated pit, Membrane

PTM / Processingi

Molecule processing

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Chaini1 – 435435AP-2 complex subunit muPRO_0000273970Add
BLAST

Amino acid modifications

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Modified residuei45 – 451PhosphoserineBy similarity
Modified residuei156 – 1561PhosphothreonineBy similarity

Post-translational modificationi

Phosphorylated.By similarity

Keywords - PTMi

Phosphoprotein

Proteomic databases

PaxDbiQ3ZC13.
PRIDEiQ3ZC13.

Expressioni

Gene expression databases

BgeeiENSBTAG00000020106.

Interactioni

Subunit structurei

Adaptor protein complex 2 (AP-2) is a heterotetramer composed of two large adaptins (alpha-type subunit AP2A1 or AP2A2 and beta-type subunit AP2B1), a medium adaptin (mu-type subunit AP2M1) and a small adaptin (sigma-type subunit AP2S1). Interacts with ATP6V1H and MEGF10. Interacts with EGFR. Interacts with F2R. Interacts with PIP5K1C; tyrosine phosphorylation of PIP5K1C weakens the interaction. Interacts with KIAA0319; required for clathrin-mediated endocytosis of KIAA0319 (By similarity). Interacts with DVL2 (via DEP domain) (By similarity). Interacts with KCNQ1; mediates estrogen-induced internalization via clathrin-coated vesicles (By similarity).By similarity

Protein-protein interaction databases

STRINGi9913.ENSBTAP00000016526.

Structurei

3D structure databases

ProteinModelPortaliQ3ZC13.
SMRiQ3ZC13. Positions 1-435.
ModBaseiSearch...
MobiDBiSearch...

Family & Domainsi

Domains and Repeats

Feature keyPosition(s)LengthDescriptionGraphical viewFeature identifierActions
Domaini170 – 434265MHDPROSITE-ProRule annotationAdd
BLAST

Sequence similaritiesi

Contains 1 MHD (mu homology) domain.PROSITE-ProRule annotation

Phylogenomic databases

eggNOGiKOG0937. Eukaryota.
ENOG410XPFS. LUCA.
GeneTreeiENSGT00530000062779.
HOGENOMiHOG000173246.
HOVERGENiHBG050516.
InParanoidiQ3ZC13.
KOiK11826.
OMAiPPLSMNF.
OrthoDBiEOG091G06XI.
TreeFamiTF300722.

Family and domain databases

InterProiIPR022775. AP_mu_sigma_su.
IPR001392. Clathrin_mu.
IPR018240. Clathrin_mu_CS.
IPR011012. Longin-like_dom.
IPR028565. MHD.
[Graphical view]
PfamiPF00928. Adap_comp_sub. 1 hit.
PF01217. Clat_adaptor_s. 1 hit.
[Graphical view]
PIRSFiPIRSF005992. Clathrin_mu. 1 hit.
PRINTSiPR00314. CLATHRINADPT.
SUPFAMiSSF49447. SSF49447. 1 hit.
SSF64356. SSF64356. 1 hit.
PROSITEiPS00990. CLAT_ADAPTOR_M_1. 1 hit.
PS00991. CLAT_ADAPTOR_M_2. 1 hit.
PS51072. MHD. 1 hit.
[Graphical view]

Sequencei

Sequence statusi: Complete.

Q3ZC13-1 [UniParc]FASTAAdd to basket

« Hide

        10         20         30         40         50
MIGGLFIYNH KGEVLISRVY RDDIGRNAVD AFRVNVIHAR QQVRSPVTNI
60 70 80 90 100
ARTSFFHVKR SNIWLAAVTK QNVNAAMVFE FLYKMCDVMA AYFGKISEEN
110 120 130 140 150
IKNNFVLIYE LLDEILDFGY PQNSETGALK TFITQQGIKS QHQTKEEQSQ
160 170 180 190 200
ITSQVTGQIG WRREGIKYRR NELFLDVLES VNLLMSPQGQ VLSAHVSGRV
210 220 230 240 250
VMKSYLSGMP ECKFGMNDKI VIEKQGKGTA DETSKSGKQS IAIDDCTFHQ
260 270 280 290 300
CVRLSKFDSE RSISFIPPDG EFELMRYRTT KDIILPFRVI PLVREVGRTK
310 320 330 340 350
LEVKVVIKSN FKPSLLAQKI EVRIPTPLNT SGVQVICMKG KAKYKASENA
360 370 380 390 400
IVWKIKRMAG MKESQISAEI ELLPTNDKKK WARPPISMNF EVPFAPSGLK
410 420 430
VRYLKVFEPK LNYSDHDVIK WVRYIGRSGI YETRC
Length:435
Mass (Da):49,655
Last modified:September 27, 2005 - v1
Checksum:i82803219BA279954
GO

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
BC102983 mRNA. Translation: AAI02984.1.
RefSeqiNP_001029695.1. NM_001034523.2.
UniGeneiBt.58835.

Genome annotation databases

EnsembliENSBTAT00000016526; ENSBTAP00000016526; ENSBTAG00000020106.
GeneIDi517446.
KEGGibta:517446.

Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
BC102983 mRNA. Translation: AAI02984.1.
RefSeqiNP_001029695.1. NM_001034523.2.
UniGeneiBt.58835.

3D structure databases

ProteinModelPortaliQ3ZC13.
SMRiQ3ZC13. Positions 1-435.
ModBaseiSearch...
MobiDBiSearch...

Protein-protein interaction databases

STRINGi9913.ENSBTAP00000016526.

Proteomic databases

PaxDbiQ3ZC13.
PRIDEiQ3ZC13.

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Genome annotation databases

EnsembliENSBTAT00000016526; ENSBTAP00000016526; ENSBTAG00000020106.
GeneIDi517446.
KEGGibta:517446.

Organism-specific databases

CTDi1173.

Phylogenomic databases

eggNOGiKOG0937. Eukaryota.
ENOG410XPFS. LUCA.
GeneTreeiENSGT00530000062779.
HOGENOMiHOG000173246.
HOVERGENiHBG050516.
InParanoidiQ3ZC13.
KOiK11826.
OMAiPPLSMNF.
OrthoDBiEOG091G06XI.
TreeFamiTF300722.

Enzyme and pathway databases

ReactomeiR-BTA-177504. Retrograde neurotrophin signalling.
R-BTA-182971. EGFR downregulation.
R-BTA-190873. Gap junction degradation.
R-BTA-196025. Formation of annular gap junctions.
R-BTA-2132295. MHC class II antigen presentation.
R-BTA-416993. Trafficking of GluR2-containing AMPA receptors.
R-BTA-437239. Recycling pathway of L1.
R-BTA-5099900. WNT5A-dependent internalization of FZD4.

Gene expression databases

BgeeiENSBTAG00000020106.

Family and domain databases

InterProiIPR022775. AP_mu_sigma_su.
IPR001392. Clathrin_mu.
IPR018240. Clathrin_mu_CS.
IPR011012. Longin-like_dom.
IPR028565. MHD.
[Graphical view]
PfamiPF00928. Adap_comp_sub. 1 hit.
PF01217. Clat_adaptor_s. 1 hit.
[Graphical view]
PIRSFiPIRSF005992. Clathrin_mu. 1 hit.
PRINTSiPR00314. CLATHRINADPT.
SUPFAMiSSF49447. SSF49447. 1 hit.
SSF64356. SSF64356. 1 hit.
PROSITEiPS00990. CLAT_ADAPTOR_M_1. 1 hit.
PS00991. CLAT_ADAPTOR_M_2. 1 hit.
PS51072. MHD. 1 hit.
[Graphical view]
ProtoNetiSearch...

Entry informationi

Entry nameiAP2M1_BOVIN
AccessioniPrimary (citable) accession number: Q3ZC13
Entry historyi
Integrated into UniProtKB/Swiss-Prot: January 23, 2007
Last sequence update: September 27, 2005
Last modified: September 7, 2016
This is version 81 of the entry and version 1 of the sequence. [Complete history]
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program

Miscellaneousi

Keywords - Technical termi

Complete proteome, Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families

Similar proteinsi

Links to similar proteins from the UniProt Reference Clusters (UniRef) at 100%, 90% and 50% sequence identity:
100%UniRef100 combines identical sequences and sub-fragments with 11 or more residues from any organism into one UniRef entry.
90%UniRef90 is built by clustering UniRef100 sequences that have at least 90% sequence identity to, and 80% overlap with, the longest sequence (a.k.a seed sequence).
50%UniRef50 is built by clustering UniRef90 seed sequences that have at least 50% sequence identity to, and 80% overlap with, the longest sequence in the cluster.