3P74 image
Deposition Date 2010-10-12
Release Date 2011-03-23
Last Version Date 2024-02-21
Entry Detail
PDB ID:
3P74
Keywords:
Title:
H181N mutant of pentaerythritol tetranitrate reductase containing a C-terminal His8-tag
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.20 Å
R-Value Free:
0.15
R-Value Work:
0.13
R-Value Observed:
0.13
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Pentaerythritol tetranitrate reductase
Gene (Uniprot):onr
Mutations:H181N
Chain IDs:A
Chain Length:373
Number of Molecules:1
Biological Source:Enterobacter cloacae
Ligand Molecules
Primary Citation
A Site-Saturated Mutagenesis Study of Pentaerythritol Tetranitrate Reductase Reveals that Residues 181 and 184 Influence Ligand Binding, Stereochemistry and Reactivity.
Chembiochem 12 738 749 (2011)
PMID: 21374779 DOI: 10.1002/cbic.201000662

Abstact

We have conducted a site-specific saturation mutagenesis study of H181 and H184 of flavoprotein pentaerythritol tetranitrate reductase (PETN reductase) to probe the role of these residues in substrate binding and catalysis with a variety of α,β-unsaturated alkenes. Single mutations at these residues were sufficient to dramatically increase the enantiopurity of products formed by reduction of 2-phenyl-1-nitropropene. In addition, many mutants exhibited a switch in reactivity to predominantly catalyse nitro reduction, as opposed to CC reduction. These mutants showed an enhancement in a minor side reaction and formed 2-phenylpropanal oxime from 2-phenyl-1-nitropropene. The multiple binding conformations of hydroxy substituted nitro-olefins in PETN reductase were examined by using both structural and catalytic techniques. These compounds were found to bind in both active and inhibitory complexes; this highlights the plasticity of the active site and the ability of the H181/H184 couple to coordinate with multiple functional groups. These properties demonstrate the potential to use PETN reductase as a scaffold in the development of industrially useful biocatalysts.

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Primary Citation of related structures