6CN3

Crystal structure of zebrafish Phosphatidylinositol-4-phosphate 5- kinase alpha isoform D236A


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.351 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.230 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structural insights into lethal contractural syndrome type 3 (LCCS3) caused by a missense mutation of PIP5K gamma.

Zeng, X.Uyar, A.Sui, D.Donyapour, N.Wu, D.Dickson, A.Hu, J.

(2018) Biochem. J. 475: 2257-2269

  • DOI: 10.1042/BCJ20180326
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Signaling molecule phosphatidylinositol 4,5-bisphosphate is produced primarily by phosphatidylinositol 4-phosphate 5-kinase (PIP5K). PIP5K is essential for the development of the human neuronal system, which has been exemplified by a recessive geneti ...

    Signaling molecule phosphatidylinositol 4,5-bisphosphate is produced primarily by phosphatidylinositol 4-phosphate 5-kinase (PIP5K). PIP5K is essential for the development of the human neuronal system, which has been exemplified by a recessive genetic disorder, lethal congenital contractural syndrome type 3, caused by a single aspartate-to-asparagine mutation in the kinase domain of PIP5Kγ. So far, the exact role of this aspartate residue has yet to be elucidated. In this work, we conducted structural, functional and computational studies on a zebrafish PIP5Kα variant with a mutation at the same site. Compared with the structure of the wild-type (WT) protein in the ATP-bound state, the ATP-associating glycine-rich loop of the mutant protein was severely disordered and the temperature factor of ATP was significantly higher. Both observations suggest a greater degree of disorder of the bound ATP, whereas neither the structure of the catalytic site nor the K m toward ATP was substantially affected by the mutation. Microsecond molecular dynamics simulation revealed that negative charge elimination caused by the mutation destabilized the involved hydrogen bonds and affected key electrostatic interactions in the close proximity of ATP. Taken together, our data indicated that the disease-related aspartate residue is a key node in the interaction network crucial for effective ATP binding. This work provides a paradigm of how a subtle but critical structural perturbation caused by a single mutation at the ATP-binding site abolishes the kinase activity, emphasizing that stabilizing substrate in a productive conformational state is crucial for catalysis.


    Organizational Affiliation

    Department of Chemistry, Michigan State University, East Lansing, MI 48824, U.S.A.,Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, U.S.A.,Department of Computational Mathematics, Science and Engineering, Michigan State University, East Lansing, MI 48824, U.S.A.,Department of Biochemistry and Molecular Biology, Michigan State University, East Lansing, MI 48824, U.S.A. hujian1@msu.edu alexrd@msu.edu.,Department of Pharmacology, Yale School of Medicine, New Haven, CT 06520, U.S.A.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Phosphatidylinositol-4-phosphate 5-kinase, type I, alpha
A
394Danio rerioMutation(s): 1 
Gene Names: pip5k1aa (pip5k1a)
Find proteins for Q503I3 (Danio rerio)
Go to UniProtKB:  Q503I3
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.351 Å
  • R-Value Free: 0.272 
  • R-Value Work: 0.230 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 89.327α = 90.00
b = 89.327β = 90.00
c = 156.655γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
DENZOdata reduction
PDB_EXTRACTdata extraction
PHASERphasing
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2018-03-07 
  • Released Date: 2018-03-21 
  • Deposition Author(s): Zeng, X., Sui, D., Hu, J.

Revision History 

  • Version 1.0: 2018-03-21
    Type: Initial release
  • Version 1.1: 2019-04-03
    Type: Data collection, Database references