1FHX image
Entry Detail
PDB ID:
1FHX
Keywords:
SIGNALING PROTEIN
Title:
Structure of the pleckstrin homology domain from GRP1 in complex with inositol 1,3,4,5-tetrakisphosphate
Biological Source:
Source Organism:
Mus musculus
Host Organism:
Escherichia coli
PDB Version:
Deposition Date:
2000-08-02
Release Date:
2000-08-23
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.50 Å
R-Value Free:
0.28
R-Value Work:
0.22
R-Value Observed:
0.22
Space Group:
P 21 21 21
1FHX validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Description:GUANINE NUCLEOTIDE EXCHANGE FACTOR AND INTEGRIN BINDING PROTEIN HOMOLOG GRP1
Chain IDs:A, B
Chain Length:129
Number of Molecules:2
Biological Source:Mus musculus
UniProt ID:O08967 Pfam ID:PF00169
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Ligand Molecules
4IP
SO4
Primary Citation
Structural basis for discrimination of 3-phosphoinositides by pleckstrin homology domains
Mol.Cell 6 373 384 (2000)
PMID: 10983984 DOI: 10.1016/S1097-2765(00)00037-X

Abstact

Pleckstrin homology (PH) domains are protein modules of around 120 amino acids found in many proteins involved in cellular signaling. Certain PH domains drive signal-dependent membrane recruitment of their host proteins by binding strongly and specifically to lipid second messengers produced by agonist-stimulated phosphoinositide 3-kinases (PI 3-Ks). We describe X-ray crystal structures of two different PH domains bound to Ins(1,3,4,5)P4, the head group of the major PI 3-K product PtdIns(3,4,5)P3. One of these PH domains (from Grp1) is PtdIns(3,4,5)P3 specific, while the other (from DAPP1/PHISH) binds strongly to both PtdIns(3,4,5)P3 and its 5'-dephosphorylation product, PtdIns(3,4)P2. Comparison of the two structures provides an explanation for the distinct phosphoinositide specificities of the two PH domains and allows us to predict the 3-phosphoinositide selectivity of uncharacterized PH domains.

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Primary Citation of related structures
1FHW