3H85

Molecular basis for the association of PIPKI gamma-p90 with the clathrin adaptor AP-2


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Molecular basis for association of PIPKI gamma-p90 with clathrin adaptor AP-2.

Kahlfeldt, N.Vahedi-Faridi, A.Koo, S.J.Schafer, J.G.Krainer, G.Keller, S.Saenger, W.Krauss, M.Haucke, V.

(2010) J.Biol.Chem. 285: 2734-2749

  • DOI: 10.1074/jbc.M109.074906
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P(2)) is an essential determinant in clathrin-mediated endocytosis (CME). In mammals three type I phosphatidylinositol-4-phosphate 5-kinase (PIPK) enzymes are expressed, with the I gamma-p90 isoform being ...

    Phosphatidylinositol 4,5-bisphosphate (PI(4,5)P(2)) is an essential determinant in clathrin-mediated endocytosis (CME). In mammals three type I phosphatidylinositol-4-phosphate 5-kinase (PIPK) enzymes are expressed, with the I gamma-p90 isoform being highly expressed in the brain where it regulates synaptic vesicle (SV) exo-/endocytosis at nerve terminals. How precisely PI(4,5)P(2) metabolism is controlled spatially and temporally is still uncertain, but recent data indicate that direct interactions between type I PIPK and components of the endocytic machinery, in particular the AP-2 adaptor complex, are involved. Here we demonstrated that PIPKI gamma-p90 associates with both the mu and beta2 subunits of AP-2 via multiple sites. Crystallographic data show that a peptide derived from the splice insert of the human PIPKI gamma-p90 tail binds to a cognate recognition site on the sandwich subdomain of the beta2 appendage. Partly overlapping aromatic and hydrophobic residues within the same peptide also can engage the C-terminal sorting signal binding domain of AP-2mu, thereby potentially competing with the sorting of conventional YXXØ motif-containing cargo. Biochemical and structure-based mutagenesis analysis revealed that association of the tail domain of PIPKI gamma-p90 with AP-2 involves both of these sites. Accordingly the ability of overexpressed PIPKI gamma tail to impair endocytosis of SVs in primary neurons largely depends on its association with AP-2 beta and AP-2mu. Our data also suggest that interactions between AP-2 and the tail domain of PIPKI gamma-p90 may serve to regulate complex formation and enzymatic activity. We postulate a model according to which multiple interactions between PIPKI gamma-p90 and AP-2 lead to spatiotemporally controlled PI(4,5)P(2) synthesis during clathrin-mediated SV endocytosis.


    Organizational Affiliation

    Institute of Chemistry and Biochemistry, Department of Membrane Biochemistry, Freie Universität Berlin, 14195 Berlin, Germany.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AP-2 complex subunit mu-1
A
299Rattus norvegicusMutation(s): 0 
Gene Names: Ap2m1
Find proteins for P84092 (Rattus norvegicus)
Go to UniProtKB:  P84092
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Phosphatidylinositol-4-phosphate 5-kinase type-1 gamma
P
8Homo sapiensMutation(s): 0 
Gene Names: PIP5K1C (KIAA0589)
EC: 2.7.1.68
Find proteins for O60331 (Homo sapiens)
Go to Gene View: PIP5K1C
Go to UniProtKB:  O60331
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
NI
Query on NI

Download SDF File 
Download CCD File 
A
NICKEL (II) ION
Ni
VEQPNABPJHWNSG-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.6 Å
  • R-Value Free: 0.263 
  • R-Value Work: 0.231 
  • Space Group: P 64
Unit Cell:
Length (Å)Angle (°)
a = 125.301α = 90.00
b = 125.301β = 90.00
c = 74.546γ = 120.00
Software Package:
Software NamePurpose
MOLREPphasing
SCALEPACKdata scaling
REFMACrefinement
ADSCdata collection
DENZOdata reduction
PDB_EXTRACTdata extraction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-11-24
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-11-01
    Type: Refinement description