2CN1

Crystal structure of Human Cytosolic 5'-Nucleotidase III (NT5C3)(CASP TARGET)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.67 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.192 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal Structure of Human Cytosolic 5'-Nucleotidase II: Insights Into Allosteric Regulation and Substrate Recognition.

Wallden, K.Stenmark, P.Nyman, T.Flodin, S.Graslund, S.Loppnau, P.Bianchi, V.Nordlund, P.

(2007) J.Biol.Chem. 282: 17828

  • DOI: 10.1074/jbc.M700917200
  • Primary Citation of Related Structures:  
  • Also Cited By: 2VKQ

  • PubMed Abstract: 
  • Cytosolic 5'-nucleotidase II catalyzes the dephosphorylation of 6-hydroxypurine nucleoside 5'-monophosphates and regulates the IMP and GMP pools within the cell. It possesses phosphotransferase activity and thereby also catalyzes the reverse reaction ...

    Cytosolic 5'-nucleotidase II catalyzes the dephosphorylation of 6-hydroxypurine nucleoside 5'-monophosphates and regulates the IMP and GMP pools within the cell. It possesses phosphotransferase activity and thereby also catalyzes the reverse reaction. Both reactions are allosterically activated by adenine-based nucleotides and 2,3-bisphosphoglycerate. We have solved structures of cytosolic 5'-nucleotidase II as native protein (2.2 Angstrom) and in complex with adenosine (1.5 Angstrom) and beryllium trifluoride (2.15 Angstrom) The tetrameric enzyme is structurally similar to enzymes of the haloacid dehalogenase (HAD) superfamily, including mitochondrial 5'(3')-deoxyribonucleotidase and cytosolic 5'-nucleotidase III but possesses additional regulatory regions that contain two allosteric effector sites. At effector site 1 located near a subunit interface we modeled diadenosine tetraphosphate with one adenosine moiety in each subunit. This efficiently glues the tetramer subunits together in pairs. The model shows why diadenosine tetraphosphate but not diadenosine triphosphate activates the enzyme and supports a role for cN-II during apoptosis when the level of diadenosine tetraphosphate increases. We have also modeled 2,3-bisphosphoglycerate in effector site 1 using one phosphate site from each subunit. By comparing the structure of cytosolic 5'-nucleotidase II with that of mitochondrial 5'(3')-deoxyribonucleotidase in complex with dGMP, we identified residues involved in substrate recognition.


    Organizational Affiliation

    Department of Biochemistry and Biophysics, Stockholm University, 10691 Stockholm, Sweden.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CYTOSOLIC 5'-NUCLEOTIDASE III
A
292Homo sapiensMutation(s): 0 
Gene Names: NT5C3A (NT5C3, P5N1, UMPH1)
EC: 3.1.3.5
Find proteins for Q9H0P0 (Homo sapiens)
Go to Gene View: NT5C3A
Go to UniProtKB:  Q9H0P0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.67 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.192 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 86.389α = 90.00
b = 100.951β = 90.00
c = 76.723γ = 90.00
Software Package:
Software NamePurpose
SCALAdata scaling
MOLREPphasing
REFMACrefinement
MOSFLMdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Revision History 

  • Version 1.0: 2006-06-12
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Version format compliance