1M27

Crystal structure of SAP/FynSH3/SLAM ternary complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

SAP couples Fyn to SLAM immune receptors.

Chan, B.Lanyi, A.Song, H.K.Griesbach, J.Simarro-Grande, M.Poy, F.Howie, D.Sumegi, J.Terhorst, C.Eck, M.J.

(2003) NAT.CELL BIOL. 5: 155-160

  • DOI: 10.1038/ncb920

  • PubMed Abstract: 
  • SAP (SLAM-associated protein) is a small lymphocyte-specific signalling molecule that is defective or absent in patients with X-linked lymphoproliferative syndrome (XLP). Consistent with its single src homology 2 (SH2) domain architecture and unusual ...

    SAP (SLAM-associated protein) is a small lymphocyte-specific signalling molecule that is defective or absent in patients with X-linked lymphoproliferative syndrome (XLP). Consistent with its single src homology 2 (SH2) domain architecture and unusually high affinity for SLAM (also called CD150), SAP has been suggested to function by blocking binding of SHP-2 or other SH2-containing signalling proteins to SLAM receptors. Additionally, SAP has recently been shown to be required for recruitment and activation of the Src-family kinase FynT after SLAM ligation. This signalling 'adaptor' function has been difficult to conceptualize, because unlike typical SH2-adaptor proteins, SAP contains only a single SH2 domain and lacks other recognized protein interaction domains or motifs. Here, we show that the SAP SH2 domain binds to the SH3 domain of FynT and directly couples FynT to SLAM. The crystal structure of a ternary SLAM-SAP-Fyn-SH3 complex reveals that SAP binds the FynT SH3 domain through a surface-surface interaction that does not involve canonical SH3 or SH2 binding interactions. The observed mode of binding to the Fyn-SH3 domain is expected to preclude the auto-inhibited conformation of Fyn, thereby promoting activation of the kinase after recruitment. These findings broaden our understanding of the functional repertoire of SH3 and SH2 domains.


    Organizational Affiliation

    Department of Cancer Biology, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
SH2 domain protein 1A
A
104Homo sapiensGene Names: SH2D1A (DSHP, SAP)
Find proteins for O60880 (Homo sapiens)
Go to Gene View: SH2D1A
Go to UniProtKB:  O60880
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Signaling lymphocytic activation molecule
B
11Homo sapiensGene Names: SLAMF1 (SLAM)
Find proteins for Q13291 (Homo sapiens)
Go to Gene View: SLAMF1
Go to UniProtKB:  Q13291
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Proto-oncogene tyrosine-protein kinase FYN
C
61Homo sapiensGene Names: FYN
EC: 2.7.10.2
Find proteins for P06241 (Homo sapiens)
Go to Gene View: FYN
Go to UniProtKB:  P06241
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
FLC
Query on FLC

Download SDF File 
Download CCD File 
A
CITRATE ANION
C6 H5 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-K
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.266 
  • R-Value Work: 0.213 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 52.909α = 90.00
b = 52.909β = 90.00
c = 183.079γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
CNSrefinement
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-05-06
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance