1fhw
Structure of the pleckstrin homology domain from GRP1 in complex with inositol(1,3,4,5,6)pentakisphosphate
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OverviewOverview
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.
About this StructureAbout this Structure
1FHW is a Single protein structure of sequence from Mus musculus with and as ligands. Full crystallographic information is available from OCA.
ReferenceReference
Structural basis for discrimination of 3-phosphoinositides by pleckstrin homology domains., Ferguson KM, Kavran JM, Sankaran VG, Fournier E, Isakoff SJ, Skolnik EY, Lemmon MA, Mol Cell. 2000 Aug;6(2):373-84. PMID:10983984
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