1Q2H

Phenylalanine Zipper Mediates APS Dimerization


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.250 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

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: 10.1038/nsmb829

  • 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 dimeriza ...

    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.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
adaptor protein with pleckstrin homology and src homology 2 domains
A, B, C
69Homo sapiensGene Names: SH2B2 (APS)
Find proteins for O14492 (Homo sapiens)
Go to Gene View: SH2B2
Go to UniProtKB:  O14492
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.7 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.250 
  • Space Group: P 21 21 2
Unit Cell:
Length (Å)Angle (°)
a = 69.740α = 90.00
b = 57.480β = 90.00
c = 51.720γ = 90.00
Software Package:
Software NamePurpose
SOLVEphasing
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2004-08-03
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance