4MZ7

Structural insight into dGTP-dependent activation of tetrameric SAMHD1 deoxynucleoside triphosphate triphosphohydrolase


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 

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This is version 1.2 of the entry. See complete history


Literature

Structural insight into dGTP-dependent activation of tetrameric SAMHD1 deoxynucleoside triphosphate triphosphohydrolase

Zhu, C.Gao, W.Zhao, K.Qin, X.Zhang, Y.Peng, X.Zhang, L.Dong, Y.Zhang, W.Li, P.Wei, W.Gong, Y.Yu, X.F.

(2013) Nat Commun 4: 2722-2722

  • DOI: 10.1038/ncomms3722
  • Primary Citation of Related Structures:  
    4MZ7

  • PubMed Abstract: 
  • SAMHD1 is a dGTP-activated deoxynucleoside triphosphate triphosphohydrolase (dNTPase) whose dNTPase activity has been linked to HIV/SIV restriction. The mechanism of its dGTP-activated dNTPase function remains unclear. Recent data also indicate that SAMHD1 regulates retrotransposition of LINE-1 elements ...

    SAMHD1 is a dGTP-activated deoxynucleoside triphosphate triphosphohydrolase (dNTPase) whose dNTPase activity has been linked to HIV/SIV restriction. The mechanism of its dGTP-activated dNTPase function remains unclear. Recent data also indicate that SAMHD1 regulates retrotransposition of LINE-1 elements. Here we report the 1.8-Å crystal structure of homotetrameric SAMHD1 in complex with the allosteric activator and substrate dGTP/dATP. The structure indicates the mechanism of dGTP-dependent tetramer formation, which requires the cooperation of three subunits and two dGTP/dATP molecules at each allosteric site. Allosteric dGTP binding induces conformational changes at the active site, allowing a more stable interaction with the substrate and explaining the dGTP-induced SAMHD1 dNTPase activity. Mutations of dGTP binding residues in the allosteric site affect tetramer formation, dNTPase activity and HIV-1 restriction. dGTP-triggered tetramer formation is also important for SAMHD1-mediated LINE-1 regulation. The structural and functional information provided here should facilitate future investigation of SAMHD1 function, including dNTPase activity, LINE-1 modulation and HIV-1 restriction.


    Organizational Affiliation

    1] School of Life Sciences, Tianjin University, Tianjin 300072, China [2].



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Deoxynucleoside triphosphate triphosphohydrolase SAMHD1 AB539Homo sapiensMutation(s): 1 
Gene Names: SAMHD1MOP5
EC: 3.1.5
Find proteins for Q9Y3Z3 (Homo sapiens)
Explore Q9Y3Z3 
Go to UniProtKB:  Q9Y3Z3
NIH Common Fund Data Resources
PHAROS:  Q9Y3Z3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.226 
  • R-Value Work: 0.194 
  • R-Value Observed: 0.196 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 147.404α = 90
b = 103.608β = 121.98
c = 92.134γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
PHASESphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-11-20
    Type: Initial release
  • Version 1.1: 2013-12-18
    Changes: Database references
  • Version 1.2: 2017-03-29
    Changes: Refinement description