4XH8

Crystal Structure of E112A/D230A Mutant of Stationary Phase Survival Protein (SurE) from Salmonella typhimurium


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.56 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.264 

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This is version 1.1 of the entry. See complete history


Literature

Insights into stabilizing interactions in the distorted domain-swapped dimer of Salmonella typhimurium survival protein.

Mathiharan, Y.K.Savithri, H.S.Murthy, M.R.

(2015) Acta Crystallogr D Biol Crystallogr 71: 1812-1823

  • DOI: 10.1107/S1399004715011992
  • Primary Citation of Related Structures:  
    4RYT, 4RYU, 4XER, 4XEP, 4XGB, 4XH8, 4XGP, 4XJ7

  • PubMed Abstract: 
  • The survival protein SurE from Salmonella typhimurium (StSurE) is a dimeric protein that functions as a phosphatase. SurE dimers are formed by the swapping of a loop with a pair of β-strands and a C-terminal helix between two protomers. In a previous study, the Asp230 and His234 residues were mutated to Ala to abolish a hydrogen bond that was thought to be crucial for C-terminal helix swapping ...

    The survival protein SurE from Salmonella typhimurium (StSurE) is a dimeric protein that functions as a phosphatase. SurE dimers are formed by the swapping of a loop with a pair of β-strands and a C-terminal helix between two protomers. In a previous study, the Asp230 and His234 residues were mutated to Ala to abolish a hydrogen bond that was thought to be crucial for C-terminal helix swapping. These mutations led to functionally inactive and distorted dimers in which the two protomers were related by a rotation of 167°. New salt bridges involving Glu112 were observed in the dimeric interface of the H234A and D230A/H234A mutants. To explore the role of these salt bridges in the stability of the distorted structure, E112A, E112A/D230A, E112A/H234A, E112A/D230A/H234A, R179L/H180A/H234A and E112A/R179L/H180A/H234A mutants were constructed. X-ray crystal structures of the E112A, E112A/H234A and E112A/D230A mutants could be determined. The dimeric structures of the E112A and E112A/H234A mutants were similar to that of native SurE, while the E112A/D230A mutant had a residual rotation of 11° between the B chains upon superposition of the A chains of the mutant and native dimers. The native dimeric structure was nearly restored in the E112A/H234A mutant, suggesting that the new salt bridge observed in the H234A and D230A/H234A mutants was indeed responsible for the stability of their distorted structures. Catalytic activity was also restored in these mutants, implying that appropriate dimeric organization is necessary for the activity of SurE.


    Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bangalore 560 012, India.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
5'/3'-nucleotidase SurEA, B267Salmonella enterica subsp. enterica serovar Typhimurium str. LT2Mutation(s): 2 
Gene Names: surESTM2927
EC: 3.1.3.5 (PDB Primary Data), 3.1.3.6 (PDB Primary Data), 3.6.1.11 (PDB Primary Data)
UniProt
Find proteins for P66881 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720))
Explore P66881 
Go to UniProtKB:  P66881
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.56 Å
  • R-Value Free: 0.304 
  • R-Value Work: 0.262 
  • R-Value Observed: 0.264 
  • Space Group: P 41 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 92.34α = 90
b = 92.34β = 90
c = 150.35γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MOSFLMdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-09
    Type: Initial release
  • Version 1.1: 2019-12-18
    Changes: Database references, Derived calculations