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- PDB-7rw9: AP2 bound to heparin in the bowl conformation -

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Basic information

Entry
Database: PDB / ID: 7rw9
TitleAP2 bound to heparin in the bowl conformation
Components
  • AP-2 complex subunit alpha-2
  • AP-2 complex subunit beta
  • AP-2 complex subunit mu
  • AP-2 complex subunit sigma
KeywordsENDOCYTOSIS / AP2 / clathrin vesicle / lipid-binding / adaptor / membrane / transport
Function / homology
Function and homology information


Formation of annular gap junctions / Gap junction degradation / LDL clearance / WNT5A-dependent internalization of FZD2, FZD5 and ROR2 / WNT5A-dependent internalization of FZD4 / Trafficking of GluR2-containing AMPA receptors / Retrograde neurotrophin signalling / clathrin adaptor complex / clathrin coat / extrinsic component of presynaptic endocytic zone membrane ...Formation of annular gap junctions / Gap junction degradation / LDL clearance / WNT5A-dependent internalization of FZD2, FZD5 and ROR2 / WNT5A-dependent internalization of FZD4 / Trafficking of GluR2-containing AMPA receptors / Retrograde neurotrophin signalling / clathrin adaptor complex / clathrin coat / extrinsic component of presynaptic endocytic zone membrane / VLDLR internalisation and degradation / cardiac septum development / Recycling pathway of L1 / AP-2 adaptor complex / regulation of vesicle size / postsynaptic neurotransmitter receptor internalization / clathrin coat assembly / Cargo recognition for clathrin-mediated endocytosis / clathrin adaptor activity / Clathrin-mediated endocytosis / positive regulation of synaptic vesicle endocytosis / membrane coat / vesicle budding from membrane / clathrin-dependent endocytosis / coronary vasculature development / MHC class II antigen presentation / positive regulation of protein localization to membrane / neurotransmitter receptor internalization / signal sequence binding / regulation of hematopoietic stem cell differentiation / aorta development / ventricular septum development / low-density lipoprotein particle receptor binding / clathrin binding / positive regulation of receptor internalization / positive regulation of endocytosis / synaptic vesicle endocytosis / negative regulation of protein localization to plasma membrane / protein serine/threonine kinase binding / vesicle-mediated transport / Neutrophil degranulation / phosphatidylinositol binding / kidney development / secretory granule / intracellular protein transport / kinase binding / cytoplasmic side of plasma membrane / disordered domain specific binding / synaptic vesicle / heart development / cytoplasmic vesicle / protein-containing complex assembly / postsynapse / transmembrane transporter binding / protein domain specific binding / intracellular membrane-bounded organelle / lipid binding / glutamatergic synapse / synapse / protein-containing complex binding / protein kinase binding / mitochondrion
Similarity search - Function
AP-2 complex subunit sigma / Clathrin adaptor, alpha-adaptin, appendage, C-terminal subdomain / Adaptor protein complex AP-2, alpha subunit / Alpha adaptin AP2, C-terminal domain / Mu2, C-terminal domain / AP-2 complex subunit mu, N-terminal / Adaptor protein complex, sigma subunit / Clathrin adaptor, beta-adaptin, appendage, Ig-like subdomain / Beta-adaptin appendage, C-terminal subdomain / AP-1/2/4 complex subunit beta ...AP-2 complex subunit sigma / Clathrin adaptor, alpha-adaptin, appendage, C-terminal subdomain / Adaptor protein complex AP-2, alpha subunit / Alpha adaptin AP2, C-terminal domain / Mu2, C-terminal domain / AP-2 complex subunit mu, N-terminal / Adaptor protein complex, sigma subunit / Clathrin adaptor, beta-adaptin, appendage, Ig-like subdomain / Beta-adaptin appendage, C-terminal subdomain / AP-1/2/4 complex subunit beta / Beta2-adaptin appendage, C-terminal sub-domain / Beta2-adaptin appendage, C-terminal sub-domain / AP complex subunit beta / : / Clathrin adaptor complex, small chain / Clathrin adaptor complexes small chain signature. / Clathrin adaptor complexes medium chain signature 1. / Clathrin adaptor, mu subunit / Clathrin adaptor, mu subunit, conserved site / Clathrin adaptor complexes medium chain signature 2. / : / Coatomer/calthrin adaptor appendage, C-terminal subdomain / Adaptor complexes medium subunit family / AP complex, mu/sigma subunit / Clathrin adaptor complex small chain / AP-2 complex subunit mu, C-terminal superfamily / Clathrin adaptor, alpha/beta/gamma-adaptin, appendage, Ig-like subdomain / Mu homology domain / Adaptin C-terminal domain / Mu homology domain (MHD) profile. / Adaptin C-terminal domain / Clathrin/coatomer adaptor, adaptin-like, N-terminal / Adaptin N terminal region / Clathrin adaptor, appendage, Ig-like subdomain superfamily / Longin-like domain superfamily / TBP domain superfamily / Armadillo/beta-catenin-like repeats / Armadillo / Armadillo-like helical / Armadillo-type fold
Similarity search - Domain/homology
AP-2 complex subunit alpha-2 / AP-2 complex subunit sigma / AP-2 complex subunit mu / AP-2 complex subunit beta
Similarity search - Component
Biological speciesMus musculus (house mouse)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.9 Å
AuthorsBaker, R.W. / Hollopeter, G. / Partlow, E.A.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)R01 GM127548-01A1 United States
CitationJournal: Nat Struct Mol Biol / Year: 2022
Title: Structural basis of an endocytic checkpoint that primes the AP2 clathrin adaptor for cargo internalization.
Authors: Edward A Partlow / Kevin S Cannon / Gunther Hollopeter / Richard W Baker /
Abstract: Clathrin-mediated endocytosis (CME) is the main route of internalization from the plasma membrane. It is known that the heterotetrameric AP2 clathrin adaptor must open to simultaneously engage ...Clathrin-mediated endocytosis (CME) is the main route of internalization from the plasma membrane. It is known that the heterotetrameric AP2 clathrin adaptor must open to simultaneously engage membrane and endocytic cargo, yet it is unclear how transmembrane cargos are captured to catalyze CME. Using cryogenic-electron microscopy, we discover a new way in which mouse AP2 can reorganize to expose membrane- and cargo-binding pockets, which is not observed in clathrin-coated structures. Instead, it is stimulated by endocytic pioneer proteins called muniscins, which do not enter vesicles. Muniscin-engaged AP2 is primed to rearrange into the vesicle-competent conformation on binding the tyrosine cargo internalization motif (YxxΦ). We propose adaptor priming as a checkpoint to ensure cargo internalization.
History
DepositionAug 19, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Mar 30, 2022Provider: repository / Type: Initial release
Revision 1.1Apr 13, 2022Group: Database references / Category: citation / citation_author / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Apr 27, 2022Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3Jun 5, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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Assembly

Deposited unit
A: AP-2 complex subunit alpha-2
B: AP-2 complex subunit beta
M: AP-2 complex subunit mu
S: AP-2 complex subunit sigma


Theoretical massNumber of molelcules
Total (without water)204,2924
Polymers204,2924
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration, AP2 was purified by affinity and gel filtration chromatography
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area11870 Å2
ΔGint-64 kcal/mol
Surface area63170 Å2

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Components

#1: Protein AP-2 complex subunit alpha-2 / 100 kDa coated vesicle protein C / Adaptor protein complex AP-2 subunit alpha-2 / Adaptor-related ...100 kDa coated vesicle protein C / Adaptor protein complex AP-2 subunit alpha-2 / Adaptor-related protein complex 2 subunit alpha-2 / Alpha-adaptin C / Alpha2-adaptin / Clathrin assembly protein complex 2 alpha-C large chain / Plasma membrane adaptor HA2/AP2 adaptin alpha C subunit


Mass: 70573.320 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Details: Expressed as a C-terminal GST fusion and the tag was removed with Prescission protease
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ap2a2, Adtab / Plasmid: pACYC Duet / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P17427
#2: Protein AP-2 complex subunit beta / AP105B / Adaptor protein complex AP-2 subunit beta / Adaptor-related protein complex 2 subunit beta ...AP105B / Adaptor protein complex AP-2 subunit beta / Adaptor-related protein complex 2 subunit beta / Beta-2-adaptin / Beta-adaptin / Clathrin assembly protein complex 2 beta large chain / Plasma membrane adaptor HA2/AP2 adaptin beta subunit


Mass: 66953.195 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ap2b1, Clapb1 / Plasmid: pET Duet / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9DBG3
#3: Protein AP-2 complex subunit mu / AP-2 mu chain / Adaptor protein complex AP-2 subunit mu / Adaptor-related protein complex 2 subunit ...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 / Mu2-adaptin / Plasma membrane adaptor AP-2 50 kDa protein


Mass: 49726.641 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ap2m1, Clapm1 / Plasmid: pET Duet / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P84091
#4: Protein AP-2 complex subunit sigma / Adaptor protein complex AP-2 subunit sigma / Adaptor-related protein complex 2 subunit sigma / ...Adaptor protein complex AP-2 subunit sigma / Adaptor-related protein complex 2 subunit sigma / Clathrin assembly protein 2 sigma small chain / Clathrin coat assembly protein AP17 / Clathrin coat-associated protein AP17 / Plasma membrane adaptor AP-2 17 kDa protein / Sigma-adaptin 3b / Sigma2-adaptin


Mass: 17038.688 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Mus musculus (house mouse) / Gene: Ap2s1, Ap17, Claps2 / Plasmid: pACYC Duet / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P62743

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: AP2 complex bound to heparin in the "bowl" conformation
Type: COMPLEX / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Mus musculus (house mouse)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria) / Plasmid: pACYC Duet; pET Duet
Buffer solutionpH: 7.4
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESC8H18N2O4S1
2150 mMSodium ChlorideNaCl1
30.05 %n-octyl-beta-d-glucosideC14H28O61
SpecimenConc.: 2 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Details: Heparin added at a 2-fold excess 20 mM HEPES pH 7.4, 150 mM NaCl, 1 mM DTT, 0.05% beta-OG
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K / Details: Blot force -10, 4 second blot, 4 uL sample

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 45000 X / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: COMA FREE
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 55 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.19.2_4158: / Classification: refinement
EM software
IDNameVersionCategory
2SerialEMimage acquisition
4cryoSPARC3.2.0CTF correction
7Coot0.8.9.1model fitting
8UCSF Chimera1.14model fitting
11cryoSPARC3.2.0final Euler assignment
13cryoSPARC3.2.03D reconstruction
14PHENIX1.19.2model refinement
Image processingDetails: Counting Mode
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 805304
3D reconstructionResolution: 3.9 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 151164 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Details: phenix.real_space_refine
Atomic model buildingPDB-ID: 2VGL

2vgl


Accession code: 2VGL / Source name: PDB / Type: experimental model
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00310540
ELECTRON MICROSCOPYf_angle_d0.62814434
ELECTRON MICROSCOPYf_dihedral_angle_d13.1763478
ELECTRON MICROSCOPYf_chiral_restr0.0411828
ELECTRON MICROSCOPYf_plane_restr0.0031823

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