4YWO

Mercuric reductase from Metallosphaera sedula


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Biochemical and Structural Properties of a Thermostable Mercuric Ion Reductase from Metallosphaera sedula.

Artz, J.H.White, S.N.Zadvornyy, O.A.Fugate, C.J.Hicks, D.Gauss, G.H.Posewitz, M.C.Boyd, E.S.Peters, J.W.

(2015) Front Bioeng Biotechnol 3: 97-97

  • DOI: 10.3389/fbioe.2015.00097
  • Primary Citation of Related Structures:  
    4YWO

  • PubMed Abstract: 
  • Mercuric ion reductase (MerA), a mercury detoxification enzyme, has been tuned by evolution to have high specificity for mercuric ions (Hg(2+)) and to catalyze their reduction to a more volatile, less toxic elemental form. Here, we present a biochemical and structural characterization of MerA from the thermophilic crenarchaeon Metallosphaera sedula ...

    Mercuric ion reductase (MerA), a mercury detoxification enzyme, has been tuned by evolution to have high specificity for mercuric ions (Hg(2+)) and to catalyze their reduction to a more volatile, less toxic elemental form. Here, we present a biochemical and structural characterization of MerA from the thermophilic crenarchaeon Metallosphaera sedula. MerA from M. sedula is a thermostable enzyme, and remains active after extended incubation at 97°C. At 37°C, the NADPH oxidation-linked Hg(2+) reduction specific activity was found to be 1.9 μmol/min⋅mg, increasing to 3.1 μmol/min⋅mg at 70°C. M. sedula MerA crystals were obtained and the structure was solved to 1.6 Å, representing the first solved crystal structure of a thermophilic MerA. Comparison of both the crystal structure and amino acid sequence of MerA from M. sedula to mesophillic counterparts provides new insights into the structural determinants that underpin the thermal stability of the enzyme.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Montana State University , Bozeman, MT , USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Mercuric reductaseA462Metallosphaera sedula DSM 5348Mutation(s): 0 
Gene Names: Msed_1241
EC: 1.16.1.1
Find proteins for A4YG49 (Metallosphaera sedula (strain ATCC 51363 / DSM 5348 / JCM 9185 / NBRC 15509 / TH2))
Explore A4YG49 
Go to UniProtKB:  A4YG49
Protein Feature View
Expand
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.197 
  • R-Value Work: 0.168 
  • R-Value Observed: 0.170 
  • Space Group: P 2 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.679α = 90
b = 95.895β = 90
c = 104.484γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
Blu-Icedata collection
HKL-2000data reduction
XDSdata scaling
HKL-2000data scaling
Aimlessdata scaling
MOLREPphasing
Cootmodel building

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-09-16
    Type: Initial release
  • Version 1.1: 2017-11-22
    Changes: Derived calculations, Refinement description