2IV8

beta appendage in complex with b-arrestin peptide

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.369 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.220 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Role of the Ap2 Beta-Appendage Hub in Recruiting Partners for Clathrin-Coated Vesicle Assembly.

Schmid, E.M., Ford, M.G.J., Burtey, A., Praefcke, G.J.K., Peak-Chew, S., Mills, I.G., Benmerah, A., Mcmahon, H.T.

(2006) PLoS Biol 4: E262

  • DOI: 10.1371/journal.pbio.0040262
  • Primary Citation of Related Structures:  
    2IV8, 2IV9

  • PubMed Abstract: 

    • Adaptor protein complex 2 alpha and beta-appendage domains act as hubs for the assembly of accessory protein networks involved in clathrin-coated vesicle formation. We identify a large repertoire of beta-appendage interactors by mass spectrometry. These interact with two distinct ligand interaction sites on the beta-appendage (the "top" and "side" sites) that bind motifs distinct from those previously identified on the alpha-appendage ...

    Adaptor protein complex 2 alpha and beta-appendage domains act as hubs for the assembly of accessory protein networks involved in clathrin-coated vesicle formation. We identify a large repertoire of beta-appendage interactors by mass spectrometry. These interact with two distinct ligand interaction sites on the beta-appendage (the "top" and "side" sites) that bind motifs distinct from those previously identified on the alpha-appendage. We solved the structure of the beta-appendage with a peptide from the accessory protein Eps15 bound to the side site and with a peptide from the accessory cargo adaptor beta-arrestin bound to the top site. We show that accessory proteins can bind simultaneously to multiple appendages, allowing these to cooperate in enhancing ligand avidities that appear to be irreversible in vitro. We now propose that clathrin, which interacts with the beta-appendage, achieves ligand displacement in vivo by self-polymerisation as the coated pit matures. This changes the interaction environment from liquid-phase, affinity-driven interactions, to interactions driven by solid-phase stability ("matricity"). Accessory proteins that interact solely with the appendages are thereby displaced to areas of the coated pit where clathrin has not yet polymerised. However, proteins such as beta-arrestin (non-visual arrestin) and autosomal recessive hypercholesterolemia protein, which have direct clathrin interactions, will remain in the coated pits with their interacting receptors.

    Organizational Affiliation: 

    Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AP-2 COMPLEX SUBUNIT BETA-1A238Homo sapiensMutation(s): 0 
Gene Names: AP2B1, ADTB2, CLAPB1
UniProt & NIH Common Fund Data Resources
Find proteins for P63010 (Homo sapiens)
Explore P63010 
Go to UniProtKB:  P63010
PHAROS:  P63010
GTEx:  ENSG00000006125 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP63010
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
BETA-ARRESTIN-1B [auth P],
C [auth Q]		20Homo sapiensMutation(s): 0 
Gene Names: ARRB1, ARR1
UniProt & NIH Common Fund Data Resources
Find proteins for P49407 (Homo sapiens)
Explore P49407 
Go to UniProtKB:  P49407
PHAROS:  P49407
GTEx:  ENSG00000137486 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP49407
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.369 
  • R-Value Work: 0.213 
  • R-Value Observed: 0.220 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 36.952α = 90
b = 35.484β = 90
c = 190.624γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-06-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Version format compliance