3FD6

Crystal structure of human selenophosphate synthetase 1 complex with ADP and phosphate


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.131 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Crystal structures of catalytic intermediates of human selenophosphate synthetase 1.

Wang, K.T.Wang, J.Li, L.F.Su, X.D.

(2009) J.Mol.Biol. 390: 747-759

  • DOI: 10.1016/j.jmb.2009.05.032
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Selenophosphate synthetase catalyzes the synthesis of the highly active selenium donor molecule selenophosphate, a key intermediate in selenium metabolism. We have determined the high-resolution crystal structure of human selenophosphate synthetase 1 ...

    Selenophosphate synthetase catalyzes the synthesis of the highly active selenium donor molecule selenophosphate, a key intermediate in selenium metabolism. We have determined the high-resolution crystal structure of human selenophosphate synthetase 1 (hSPS1). An unexpected reaction intermediate, with a tightly bound phosphate and ADP at the active site has been captured in the structure. An enzymatic assay revealed that hSPS1 possesses low ADP hydrolysis activity in the presence of phosphate. Our structural and enzymatic results suggest that consuming the second high-energy phosphoester bond of ATP could protect the labile product selenophosphate during catalytic reaction. We solved another hSPS1 structure with potassium ions at the active sites. Comparing the two structures, we were able to define the monovalent cation-binding site of the enzyme. The detailed mechanism of the ADP hydrolysis step and the exact function of the monovalent cation for hSPS1 catalytic reaction are proposed.


    Organizational Affiliation

    National Laboratory of Protein Engineering and Plant Genetic Engineering, College of Life Sciences, Peking University, Beijing, P.R. China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Selenide, water dikinase 1
A, B
394Homo sapiensMutation(s): 0 
Gene Names: SEPHS1 (SELD, SPS, SPS1)
EC: 2.7.9.3
Find proteins for P49903 (Homo sapiens)
Go to Gene View: SEPHS1
Go to UniProtKB:  P49903
Small Molecules
Ligands 4 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
PO4
Query on PO4

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Download CCD File 
A, B
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K
 Ligand Interaction
NA
Query on NA

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Download CCD File 
A, B
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
ADP
Query on ADP

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Download CCD File 
A, B
ADENOSINE-5'-DIPHOSPHATE
C10 H15 N5 O10 P2
XTWYTFMLZFPYCI-KQYNXXCUSA-N
 Ligand Interaction
MG
Query on MG

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Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.196 
  • R-Value Work: 0.131 
  • Space Group: P 43
Unit Cell:
Length (Å)Angle (°)
a = 67.618α = 90.00
b = 67.618β = 90.00
c = 182.551γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
PROTEUM PLUSdata scaling
PHENIXphasing
PROTEUM PLUSdata collection
PROTEUM PLUSdata reduction
PHENIXmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2008-11-25 
  • Released Date: 2009-09-22 
  • Deposition Author(s): Wang, K.T.

Revision History 

  • Version 1.0: 2009-09-22
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance