1H6E

MU2 ADAPTIN SUBUNIT (AP50) OF AP2 ADAPTOR (SECOND DOMAIN), COMPLEXED WITH CTLA-4 INTERNALIZATION PEPTIDE TTGVYVKMPPT


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.278 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Study of the Interaction of the Medium Chain Mu2 Subunit of the Clathrin-Associated Adapter Protein Complex 2 with Cytotoxic T-Lymphocyte Antigen 4 and Cd28

Follows, E.R.Mcpheat, J.C.Minshull, C.Moore, N.C.Pauptit, R.A.Rowsell, S.Stacey, C.L.Stanway, J.J.Taylor, I.W.Abbott, W.M.

(2001) Biochem.J. 359: 427


  • PubMed Abstract: 
  • The medium chain mu 2 subunit (AP50) of the clathrin-associated adapter protein complex 2 (AP-2) interacts specifically with the tyrosine-based signals of several integral membrane proteins through the consensus sequence YXXPhi, where X can be any re ...

    The medium chain mu 2 subunit (AP50) of the clathrin-associated adapter protein complex 2 (AP-2) interacts specifically with the tyrosine-based signals of several integral membrane proteins through the consensus sequence YXXPhi, where X can be any residue and Phi is a large hydrophobic residue. Using surface plasmon resonance combined with structural information, we have analysed the interaction of AP50 with peptides derived from the cytoplasmic tail of cytotoxic T-lymphocyte antigen 4 (CTLA-4). The crystal structure of AP50 in complex with a CTLA-4-derived peptide was determined to 3.6 A (1 A=0.1 nm) resolution. The binding domain of AP50 (residues 164-435) was expressed in Escherichia coli and purified. In agreement with previous reports, the AP50 domain bound to residues 152-174 of CTLA-4, but not to the same peptide that was phosphorylated at the single tyrosine residue (position 165). The interaction exhibited fast kinetics with rapid on and off rates and a K(d) of 0.7 microM. In order to further understand why AP50 binds to CTLA-4, but not to the homologous receptor CD28, a comparison of binding of AP50 with five peptides with single changes in and around the YXXPhi motif to the equivalent residues of CD28 was made. T162H greatly reduced binding, whereas T161L had little effect. Mutations G163S, V164D and K167N all exhibited reduced binding. Modelling of the single amino acid changes using structural information, was in broad agreement with the binding data, demonstrating that residues outside of the YXXPhi motif are also important in the interaction of membrane proteins with AP50.


    Related Citations: 
    • A Structural Explanation for the Recognition of Tyrosine-Based Endocytotic Signals
      Owen, D.J.,Evans, P.R.
      (1998) Science 282: 1327


    Organizational Affiliation

    Enabling Science and Technology, Biology Department, AstraZeneca, Mereside, Alderley Park, Macclesfield, Cheshire SK10 4TG, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CLATHRIN COAT ASSEMBLY PROTEIN AP50
A
288Homo sapiensGene Names: AP2M1 (CLAPM1, KIAA0109)
Find proteins for Q96CW1 (Homo sapiens)
Go to Gene View: AP2M1
Go to UniProtKB:  Q96CW1
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
CYTOTOXIC T-LYMPHOCYTE PROTEIN 4
P
11Homo sapiensGene Names: CTLA4 (CD152)
Find proteins for P16410 (Homo sapiens)
Go to Gene View: CTLA4
Go to UniProtKB:  P16410
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.6 Å
  • R-Value Free: 0.317 
  • R-Value Work: 0.278 
  • Space Group: P 64
Unit Cell:
Length (Å)Angle (°)
a = 126.779α = 90.00
b = 126.779β = 90.00
c = 74.161γ = 120.00
Software Package:
Software NamePurpose
SCALAdata scaling
CCP4phasing
MOSFLMdata reduction
CNXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-11-28
    Type: Initial release
  • Version 1.1: 2016-12-21
    Type: Data collection, Derived calculations, Refinement description, Source and taxonomy, Version format compliance