7RWA

AP2 bound to heparin and Tgn38 tyrosine cargo peptide


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structural basis of an endocytic checkpoint that primes the AP2 clathrin adaptor for cargo internalization.

Partlow, E.A.Cannon, K.S.Hollopeter, G.Baker, R.W.

(2022) Nat Struct Mol Biol 29: 339-347

  • DOI: https://doi.org/10.1038/s41594-022-00749-z
  • Primary Citation of Related Structures:  
    7RW8, 7RW9, 7RWA, 7RWB, 7RWC

  • PubMed 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 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.


  • Organizational Affiliation

    Department of Molecular Medicine, Cornell University, Ithaca, NY, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
AP-2 complex subunit alpha-2A,
F [auth a]
630Mus musculusMutation(s): 0 
Gene Names: Ap2a2Adtab
UniProt & NIH Common Fund Data Resources
Find proteins for P17427 (Mus musculus)
Explore P17427 
Go to UniProtKB:  P17427
IMPC:  MGI:101920
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UniProt GroupP17427
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
AP-2 complex subunit betaB,
G [auth b]
591Mus musculusMutation(s): 0 
Gene Names: Ap2b1Clapb1
UniProt & NIH Common Fund Data Resources
Find proteins for Q9DBG3 (Mus musculus)
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Go to UniProtKB:  Q9DBG3
IMPC:  MGI:1919020
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UniProt GroupQ9DBG3
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
AP-2 complex subunit muC [auth M],
H [auth m]
435Mus musculusMutation(s): 0 
Gene Names: Ap2m1Clapm1
UniProt
Find proteins for P84091 (Mus musculus)
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Go to UniProtKB:  P84091
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UniProt GroupP84091
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  • Reference Sequence
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
AP-2 complex subunit sigmaD [auth S],
I [auth s]
142Mus musculusMutation(s): 0 
Gene Names: Ap2s1Ap17Claps2
UniProt & NIH Common Fund Data Resources
Find proteins for P62743 (Mus musculus)
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Go to UniProtKB:  P62743
IMPC:  MGI:2141861
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UniProt GroupP62743
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  • Reference Sequence

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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
Trans-Golgi network integral membrane protein TGN38 peptideE [auth Y],
J [auth y]
15Mus musculusMutation(s): 0 
UniProt
Find proteins for Q62314 (Mus musculus)
Explore Q62314 
Go to UniProtKB:  Q62314
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UniProt GroupQ62314
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 4.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONcryoSPARC3.2.0
MODEL REFINEMENTPHENIX1.19.2

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR01 GM127548-01A1

Revision History  (Full details and data files)

  • Version 1.0: 2022-03-30
    Type: Initial release
  • Version 1.1: 2022-04-13
    Changes: Database references
  • Version 1.2: 2022-04-27
    Changes: Database references
  • Version 1.3: 2024-06-05
    Changes: Data collection, Refinement description