1EAZ

Crystal structure of the phosphoinositol (3,4)-bisphosphate binding PH domain of TAPP1 from human.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Crystal Structure of the Phosphatidylinositol 3,4-Bisphosphate-Binding Pleckstrin Homology (Ph) Domain of Tandem Ph-Domain-Containing Protein 1 (Tapp1): Molecular Basis of Lipid Specificity

Thomas, C.C.Dowler, S.Deak, M.Alessi, D.R.Van Aalten, D.M.F.

(2001) Biochem.J. 358: 287


  • PubMed Abstract: 
  • Phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P(3)] and its immediate breakdown product PtdIns(3,4)P(2) function as second messengers in growth factor- and insulin-induced signalling pathways. One of the ways that these 3-phosphoinositides a ...

    Phosphatidylinositol 3,4,5-trisphosphate [PtdIns(3,4,5)P(3)] and its immediate breakdown product PtdIns(3,4)P(2) function as second messengers in growth factor- and insulin-induced signalling pathways. One of the ways that these 3-phosphoinositides are known to regulate downstream signalling events is by attracting proteins that possess specific PtdIns-binding pleckstrin homology (PH) domains to the plasma membrane. Many of these proteins, such as protein kinase B, phosphoinositide-dependent kinase 1 and the dual adaptor for phosphotyrosine and 3-phosphoinositides (DAPP1) interact with both PtdIns(3,4,5)P(3) and PtdIns(3,4)P(2) with similar affinity. Recently, a new PH-domain-containing protein, termed tandem PH-domain-containing protein (TAPP) 1, was described which is the first protein reported to bind PtdIns(3,4)P(2) specifically. Here we describe the crystal structure of the PtdIns(3,4)P(2)-binding PH domain of TAPP1 at 1.4 A (1 A=0.1 nm) resolution in complex with an ordered citrate molecule. The structure is similar to the known structure of the PH domain of DAPP1 around the D-3 and D-4 inositol-phosphate-binding sites. However, a glycine residue adjacent to the D-5 inositol-phosphate-binding site in DAPP1 is substituted for a larger alanine residue in TAPP1, which also induces a conformational change in the neighbouring residues. We show that mutation of this glycine to alanine in DAPP1 converts DAPP1 into a TAPP1-like PH domain that only interacts with PtdIns(3,4)P(2), whereas the alanine to glycine mutation in TAPP1 permits the TAPP1 PH domain to interact with PtdIns(3,4,5)P(3).


    Related Citations: 
    • Structural Basis for Discrimination of 3-Phosphoinositides by Pleckstrin Homology Domains
      Ferguson, K.M.,Kavran, J.M.,Sankaran, V.G.,Fournier, E.,Isakoff, S.J.,Skolnik, E.Y.,Lemmon, M.A.
      (2000) Mol.Cell 6: 373
    • Identification of Pleckstrin-Homology-Domain-Containing Proteins with Novel Phosphoinositide-Binding Specificities
      Dowler, S.,Currie, R.A.,Campbell, D.G.,Deak, M.,Kular, G.,Downes, C.P.,Alessi, D.R.
      (2000) Biochem.J. 351: 19


    Organizational Affiliation

    Division of Biological Chemistry and Molecular Microbiology, Wellcome Trust Biocentre, School of Life Sciences, University of Dundee, Dow Street, Dundee DD1 5EH, Scotland, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TANDEM PH DOMAIN CONTAINING PROTEIN-1
A
125Homo sapiensGene Names: PLEKHA1 (TAPP1)
Find proteins for Q9HB21 (Homo sapiens)
Go to Gene View: PLEKHA1
Go to UniProtKB:  Q9HB21
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CIT
Query on CIT

Download SDF File 
Download CCD File 
A
CITRIC ACID
C6 H8 O7
KRKNYBCHXYNGOX-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.4 Å
  • R-Value Free: 0.228 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 65.017α = 90.00
b = 102.796β = 90.00
c = 41.471γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
SHELXL-97refinement
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-07-11
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance