4GTW

Crystal structure of mouse Enpp1 in complex with AMP


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.233 

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Ligand Structure Quality Assessment 


This is version 2.0 of the entry. See complete history


Literature

Crystal structure of Enpp1, an extracellular glycoprotein involved in bone mineralization and insulin signaling.

Kato, K.Nishimasu, H.Okudaira, S.Mihara, E.Ishitani, R.Takagi, J.Aoki, J.Nureki, O.

(2012) Proc Natl Acad Sci U S A 109: 16876-16881

  • DOI: https://doi.org/10.1073/pnas.1208017109
  • Primary Citation of Related Structures:  
    4GTW, 4GTX, 4GTY, 4GTZ

  • PubMed Abstract: 

    Enpp1 is a membrane-bound glycoprotein that regulates bone mineralization by hydrolyzing extracellular nucleotide triphosphates to produce pyrophosphate. Enpp1 dysfunction causes human diseases characterized by ectopic calcification. Enpp1 also inhibits insulin signaling, and an Enpp1 polymorphism is associated with insulin resistance. However, the precise mechanism by which Enpp1 functions in these cellular processes remains elusive. Here, we report the crystal structures of the extracellular region of mouse Enpp1 in complex with four different nucleotide monophosphates, at resolutions of 2.7-3.2 Å. The nucleotides are accommodated in a pocket formed by an insertion loop in the catalytic domain, explaining the preference of Enpp1 for an ATP substrate. Structural mapping of disease-associated mutations indicated the functional importance of the interdomain interactions. A structural comparison of Enpp1 with Enpp2, a lysophospholipase D, revealed marked differences in the domain arrangements and active-site architectures. Notably, the Enpp1 mutant lacking the insertion loop lost the nucleotide-hydrolyzing activity but instead gained the lysophospholipid-hydrolyzing activity of Enpp2. Our findings provide structural insights into how the Enpp family proteins evolved to exert their diverse cellular functions.


  • Organizational Affiliation

    Department of Biophysics and Biochemistry, Graduate School of Science, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ectonucleotide pyrophosphatase/phosphodiesterase family member 2, Alkaline phosphodiesterase I
A, B
823Mus musculusMutation(s): 1 
Gene Names: Enpp2Npps2Pdnp2Enpp1mCG_9001
EC: 3.1.4.39
UniProt
Find proteins for P06802 (Mus musculus)
Explore P06802 
Go to UniProtKB:  P06802
Find proteins for Q9R1E6 (Mus musculus)
Explore Q9R1E6 
Go to UniProtKB:  Q9R1E6
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsQ9R1E6P06802
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
alpha-D-mannopyranose-(1-3)-alpha-D-mannopyranose-(1-6)-[alpha-D-mannopyranose-(1-3)]beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
C
6N-Glycosylation
Glycosylation Resources
GlyTouCan:  G09724ZC
GlyCosmos:  G09724ZC
GlyGen:  G09724ZC
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose
D
2N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
AMP
Query on AMP

Download Ideal Coordinates CCD File 
G [auth A],
M [auth B]
ADENOSINE MONOPHOSPHATE
C10 H14 N5 O7 P
UDMBCSSLTHHNCD-KQYNXXCUSA-N
NAG
Query on NAG

Download Ideal Coordinates CCD File 
E [auth A],
F [auth A],
K [auth B],
L [auth B]
2-acetamido-2-deoxy-beta-D-glucopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-FMDGEEDCSA-N
ZN
Query on ZN

Download Ideal Coordinates CCD File 
H [auth A],
I [auth A],
N [auth B],
O [auth B]
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
CA
Query on CA

Download Ideal Coordinates CCD File 
J [auth A],
P [auth B]
CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
MSE
Query on MSE
A, B
L-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.70 Å
  • R-Value Free: 0.276 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.233 
  • Space Group: P 31
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 105.283α = 90
b = 105.283β = 90
c = 173.685γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
BSSdata collection
HKL-2000data reduction
HKL-2000data scaling
SHARPphasing

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-11-07
    Type: Initial release
  • Version 1.1: 2017-08-23
    Changes: Source and taxonomy
  • Version 1.2: 2017-11-15
    Changes: Refinement description
  • Version 1.3: 2018-06-20
    Changes: Data collection, Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Database references, Derived calculations, Structure summary