2HHM

STRUCTURE OF INOSITOL MONOPHOSPHATASE, THE PUTATIVE TARGET OF LITHIUM THERAPY


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structure of inositol monophosphatase, the putative target of lithium therapy.

Bone, R.Springer, J.P.Atack, J.R.

(1992) Proc.Natl.Acad.Sci.USA 89: 10031-10035


  • PubMed Abstract: 
  • Inositol monophosphatase (EC 3.1.3.25), the putative molecular site of action of lithium therapy for manic-depressive illness, plays a key role in the phosphatidylinositol signaling pathway by catalyzing the hydrolysis of inositol monophosphates. To ...

    Inositol monophosphatase (EC 3.1.3.25), the putative molecular site of action of lithium therapy for manic-depressive illness, plays a key role in the phosphatidylinositol signaling pathway by catalyzing the hydrolysis of inositol monophosphates. To provide a structural basis from which to design better therapeutic agents for manic-depressive illness, the structure of human inositol monophosphatase has been determined to 2.1-A resolution by using x-ray crystallography. The enzyme exists as a dimer of identical subunits, each folded into a five-layered sandwich of three pairs of alpha-helices and two beta-sheets. Sulfate and an inhibitory lanthanide cation (Gd3+) are bound at identical sites on each subunit and establish the positions of the active sites. Each site is located in a large hydrophilic cavern that is at the base of the two central helices where several segments of secondary structure intersect. Comparison of the phosphatase aligned sequences of several diverse genes with the phosphatase structure suggests that the products of these genes and the phosphatase form a structural family with a conserved metal binding site.


    Related Citations: 
    • C/DNA Cloning of Human and Rat Brain Myo-Inositol Monophosphatase: Expression and Characterization of the Human Recombinant Enzyme
      Mcallister, G.,Whiting, P.,Hammond, E.A.,Knowles, M.R.,Atack, J.R.,Bailey, F.J.,Maigetter, R.,Ragan, C.I.
      (1992) Biochem.J. 284: 749


    Organizational Affiliation

    Department of Biophysical Chemistry, Merck Research Laboratories, Rahway, NJ 07065.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
INOSITOL MONOPHOSPHATASE
A, B
276Homo sapiensGene Names: IMPA1 (IMPA)
EC: 3.1.3.25, 3.1.3.94
Find proteins for P29218 (Homo sapiens)
Go to Gene View: IMPA1
Go to UniProtKB:  P29218
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download SDF File 
Download CCD File 
A, B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
GD
Query on GD

Download SDF File 
Download CCD File 
A, B
GADOLINIUM ATOM
Gd
UIWYJDYFSGRHKR-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 86.200α = 90.00
b = 86.200β = 90.00
c = 154.300γ = 120.00
Software Package:
Software NamePurpose
PROLSQrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 1992-10-20 
  • Released Date: 1993-10-31 
  • Deposition Author(s): Bone, R.

Revision History 

  • Version 1.0: 1993-10-31
    Type: Initial release
  • Version 1.1: 2008-03-03
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-11-29
    Type: Advisory, Derived calculations, Other