4YWO image
Entry Detail
PDB ID:
4YWO
Keywords:
Title:
Mercuric reductase from Metallosphaera sedula
Biological Source:
PDB Version:
Deposition Date:
2015-03-20
Release Date:
2015-09-16
Method Details:
Experimental Method:
Resolution:
1.62 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 2 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Mercuric reductase
Chain IDs:A
Chain Length:462
Number of Molecules:1
Biological Source:Metallosphaera sedula (strain ATCC 51363 / DSM 5348)
Primary Citation
Biochemical and Structural Properties of a Thermostable Mercuric Ion Reductase from Metallosphaera sedula.
Front Bioeng Biotechnol 3 97 97 (2015)
PMID: 26217660 DOI: 10.3389/fbioe.2015.00097

Abstact

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.

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