4O8C

Structure of the H170Y mutant of thermostable p-nitrophenylphosphatase from Bacillus Stearothermophilus


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structure of a His170Tyr mutant of thermostable pNPPase from Geobacillus stearothermophilus.

Shen, T.Guo, Z.Ji, C.

(2014) Acta Crystallogr F Struct Biol Commun 70: 697-702

  • DOI: 10.1107/S2053230X14007341
  • Primary Citation of Related Structures:  
    4O8C

  • PubMed Abstract: 
  • Using directed evolution based on random mutagenesis and heat-treated selection, a thermostable His170Tyr mutant of Geobacillus stearothermophilus thermostable p-nitrophenylphosphatase (TpNPPase) was obtained. The temperature at which the His170Tyr m ...

    Using directed evolution based on random mutagenesis and heat-treated selection, a thermostable His170Tyr mutant of Geobacillus stearothermophilus thermostable p-nitrophenylphosphatase (TpNPPase) was obtained. The temperature at which the His170Tyr mutant lost 50% of its activity (T1/2) was found to be 4.40 K higher than that of wild-type TpNPPase, and the melting temperature of the His170Tyr mutant increased by 2.39 K. The crystal structure of the His170Tyr mutant was then determined at 2.0 Å resolution in the presence of a sodium ion and a sulfate ion in the active site. The cap domain of chain B shows a half-closed conformation. The hydrophobic side chain of the mutated residue, the hydroxyphenyl group, forms a hydrophobic contact with the methyl group of Ala166. This hydrophobic interaction was found using the Protein Interactions Calculator (PIC) web server with an interaction distance of 4.6 Å, and might be a key factor in the thermostabilization of the His170Tyr mutant. This study potentially offers a molecular basis for both investigation of the catalytic mechanism and thermostable protein engineering.


    Organizational Affiliation

    State Key Laboratory of Genetic Engineering, Institute of Genetics, School of Life Sciences, Fudan University, Shanghai 200433, People's Republic of China.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Thermostable NPPaseAB261Geobacillus stearothermophilusMutation(s): 1 
EC: 3.1.3.1
Find proteins for Q8L1N9 (Geobacillus stearothermophilus)
Explore Q8L1N9 
Go to UniProtKB:  Q8L1N9
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

Download CCD File 
B
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
MG
Query on MG

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

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.00 Å
  • R-Value Free: 0.214 
  • R-Value Work: 0.171 
  • R-Value Observed: 0.173 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 38.754α = 90
b = 83.245β = 90
c = 176.051γ = 90
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHENIXrefinement
PDB_EXTRACTdata extraction
HKL-2000data collection
PHENIXphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2014-06-18
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Refinement description
  • Version 1.2: 2020-01-01
    Changes: Database references