4QFX

Crystal structure of the tetrameric dGTP/dATP-bound SAMHD1 (RN206) mutant catalytic core


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.228 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural Basis of Allosteric Activation of Sterile alpha Motif and Histidine-Aspartate Domain-containing Protein 1 (SAMHD1) by Nucleoside Triphosphates.

Koharudin, L.M.Wu, Y.DeLucia, M.Mehrens, J.Gronenborn, A.M.Ahn, J.

(2014) J.Biol.Chem. 289: 32617-32627

  • DOI: 10.1074/jbc.M114.591958
  • Primary Citation of Related Structures:  4QFY, 4QFZ, 4QG0, 4QG1, 4QG2, 4QG4

  • PubMed Abstract: 
  • Sterile α motif and histidine-aspartate domain-containing protein 1 (SAMHD1) plays a critical role in inhibiting HIV infection, curtailing the pool of dNTPs available for reverse transcription of the viral genome. Recent structural data suggested a c ...

    Sterile α motif and histidine-aspartate domain-containing protein 1 (SAMHD1) plays a critical role in inhibiting HIV infection, curtailing the pool of dNTPs available for reverse transcription of the viral genome. Recent structural data suggested a compelling mechanism for the regulation of SAMHD1 enzymatic activity and revealed dGTP-induced association of two inactive dimers into an active tetrameric enzyme. Here, we present the crystal structures of SAMHD1 catalytic core (residues 113-626) tetramers, complexed with mixtures of nucleotides, including dGTP/dATP, dGTP/dCTP, dGTP/dTTP, and dGTP/dUTP. The combined structural and biochemical data provide insight into dNTP promiscuity at the secondary allosteric site and how enzymatic activity is modulated. In addition, we present biochemical analyses of GTP-induced SAMHD1 full-length tetramerization and the structure of SAMHD1 catalytic core tetramer in complex with GTP/dATP, revealing the structural basis of GTP-mediated SAMHD1 activation. Altogether, the data presented here advance our understanding of SAMHD1 function during cellular homeostasis.


    Organizational Affiliation

    From the Department of Structural Biology and Pittsburgh Center for HIV-Host Protein Interactions, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15260.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Deoxynucleoside triphosphate triphosphohydrolase SAMHD1
A, B, C, D
550Homo sapiensGene Names: SAMHD1 (MOP5)
EC: 3.1.5.-
Find proteins for Q9Y3Z3 (Homo sapiens)
Go to Gene View: SAMHD1
Go to UniProtKB:  Q9Y3Z3
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
DTP
Query on DTP

Download SDF File 
Download CCD File 
A, B, C, D
2'-DEOXYADENOSINE 5'-TRIPHOSPHATE
C10 H16 N5 O12 P3
SUYVUBYJARFZHO-RRKCRQDMSA-N
 Ligand Interaction
MG
Query on MG

Download SDF File 
Download CCD File 
A, B, C, D
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
DGT
Query on DGT

Download SDF File 
Download CCD File 
A, B, C, D
2'-DEOXYGUANOSINE-5'-TRIPHOSPHATE
C10 H16 N5 O13 P3
HAAZLUGHYHWQIW-KVQBGUIXSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.2 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.228 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 88.561α = 90.00
b = 147.264β = 114.63
c = 98.795γ = 90.00
Software Package:
Software NamePurpose
StructureStudiodata collection
PHENIXrefinement
PHASERphasing
d*TREKdata reduction
d*TREKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-10-15
    Type: Initial release
  • Version 1.1: 2014-10-22
    Type: Database references
  • Version 1.2: 2014-12-03
    Type: Database references