2XA7

AP2 clathrin adaptor core in active complex with cargo peptides


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.239 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

A Large Scale Conformational Change Couples Membrane Recruitment to Cargo Binding in the Ap2 Clathrin Adaptor Complex

Jackson, L.P.Kelly, B.T.Mccoy, A.J.Gaffry, T.James, L.C.Collins, B.M.Honing, S.Evans, P.R.Owen, D.J.

(2010) Cell 141: 1241

  • DOI: 10.1016/j.cell.2010.05.006
  • Primary Citation of Related Structures:  
    2XA7

  • PubMed Abstract: 
  • The AP2 adaptor complex (alpha, beta2, sigma2, and mu2 subunits) crosslinks the endocytic clathrin scaffold to PtdIns4,5P(2)-containing membranes and transmembrane protein cargo. In the "locked" cytosolic form, AP2's binding sites for the two endocytic motifs, YxxPhi on the C-terminal domain of mu2 (C-mu2) and [ED]xxxL[LI] on sigma2, are blocked by parts of beta2 ...

    The AP2 adaptor complex (alpha, beta2, sigma2, and mu2 subunits) crosslinks the endocytic clathrin scaffold to PtdIns4,5P(2)-containing membranes and transmembrane protein cargo. In the "locked" cytosolic form, AP2's binding sites for the two endocytic motifs, YxxPhi on the C-terminal domain of mu2 (C-mu2) and [ED]xxxL[LI] on sigma2, are blocked by parts of beta2. Using protein crystallography, we show that AP2 undergoes a large conformational change in which C-mu2 relocates to an orthogonal face of the complex, simultaneously unblocking both cargo-binding sites; the previously unstructured mu2 linker becomes helical and binds back onto the complex. This structural rearrangement results in AP2's four PtdIns4,5P(2)- and two endocytic motif-binding sites becoming coplanar, facilitating their simultaneous interaction with PtdIns4,5P(2)/cargo-containing membranes. Using a range of biophysical techniques, we show that the endocytic cargo binding of AP2 is driven by its interaction with PtdIns4,5P(2)-containing membranes.


    Organizational Affiliation

    Cambridge Institute for Medical Research, Department of Clinical Biochemistry, University of Cambridge, Hills Road, Cambridge CB2 0XY, UK.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ADAPTOR-RELATED PROTEIN COMPLEX 2, ALPHA 2 SUBUNITA621Rattus norvegicusMutation(s): 0 
Gene Names: Ap2a2Adtab
Find proteins for P18484 (Rattus norvegicus)
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Go to UniProtKB:  P18484
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
AP-2 COMPLEX SUBUNIT BETAB592Homo sapiensMutation(s): 0 
Gene Names: AP2B1ADTB2CLAPB1
Find proteins for P63010 (Homo sapiens)
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NIH Common Fund Data Resources
PHAROS:  P63010
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
AP-2 COMPLEX SUBUNIT MU,C [auth M]446Rattus norvegicusMutation(s): 0 
Gene Names: Ap2m1
Find proteins for P84092 (Rattus norvegicus)
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
TGN38 CARGO PEPTIDED [auth P]6Homo sapiensMutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
AP-2 COMPLEX SUBUNIT SIGMAE [auth S]142Mus musculusMutation(s): 0 
Gene Names: Ap2s1Ap17Claps2
Find proteins for P62743 (Mus musculus)
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Go to UniProtKB:  P62743
NIH Common Fund Data Resources
IMPC:  MGI:2141861
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.10 Å
  • R-Value Free: 0.285 
  • R-Value Work: 0.236 
  • R-Value Observed: 0.239 
  • Space Group: H 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 255.316α = 90
b = 255.316β = 90
c = 156.754γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
SHARPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-07-21
    Type: Initial release
  • Version 1.1: 2011-05-08
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance