Phenylalanine Zipper Mediates APS Dimerization

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.250 

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A phenylalanine zipper mediates APS dimerization.

Dhe-Paganon, S.Werner, E.D.Nishi, M.Hansen, L.Chi, Y.-I.Shoelson, S.E.

(2004) Nat Struct Mol Biol 11: 968-974

  • DOI: https://doi.org/10.1038/nsmb829
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    The APS, SH2-B and LNK proteins are adapters that activate and modulate receptor tyrosine kinase and JAK/STAT signaling. We now show that a conserved N-terminal domain mediates APS homodimerization. We determined the crystal structure of the dimerization domain at a resolution of 1.7 A using bromide ion MAD phasing. Each molecule contributes two helices to a compact four-helix bundle having a bisecting-U topology. Its most conspicuous feature is a stack of interdigitated phenylalanine side chains at the domain core. These residues create a new motif we refer to as a 'phenylalanine zipper,' which is critical to dimerization. A newly developed bridging yeast tri-hybrid assay showed that APS dimerizes JAK2, insulin receptor and IGF1 receptor kinases using its SH2 and dimerization domains. Dimerization via the phenylalanine zipper domain provides a mechanism for activating and modulating tyrosine kinase activity even in the absence of extracellular ligands.

  • Organizational Affiliation

    Joslin Diabetes Center and Department of Medicine, Harvard Medical School, Boston, Massachusetts 02215, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
adaptor protein with pleckstrin homology and src homology 2 domains
A, B, C
69Homo sapiensMutation(s): 0 
Gene Names: APS
UniProt & NIH Common Fund Data Resources
Find proteins for O14492 (Homo sapiens)
Explore O14492 
Go to UniProtKB:  O14492
PHAROS:  O14492
GTEx:  ENSG00000160999 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO14492
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.250 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.74α = 90
b = 57.48β = 90
c = 51.72γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-29
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2022-12-21
    Changes: Database references