Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 41.16 kDa 
• Atom Count: 3566 
• Residue Count: 364 
• Unique protein chains: 1

3P62

Wild-type pentaerythritol tetranitrate reductase containing a C-terminal 8-histidine tag

• DOI: 10.2210/pdb3P62/pdb

• Classification: OXIDOREDUCTASE
• Organism(s): Enterobacter cloacae
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2010-10-11 Released: 2010-11-24 
• Deposition Author(s): Toogood, H.S., Hulley, M.E., Scrutton, N.S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.156 
• R-Value Work: 0.126 
• R-Value Observed: 0.127 

Literature

Focused Directed Evolution of Pentaerythritol Tetranitrate Reductase by Using Automated Anaerobic Kinetic Screening of Site-Saturated Libraries

Hulley, M.E., Toogood, H.S., Fryszkowska, A., Mansell, D., Stephens, G.M., Gardiner, J.M., Scrutton, N.S.

(2010) Chembiochem 11: 2433-2447

• PubMed: 21064170 
• DOI: 10.1002/cbic.201000527
• Primary Citation of Related Structures:  
  3P62, 3P67


• PubMed Abstract: 
  

This work describes the development of an automated robotic platform for the rapid screening of enzyme variants generated from directed evolution studies of pentraerythritol tetranitrate (PETN) reductase, a target for industrial biocatalysis. By using a 96-well format, near pure enzyme was recovered and was suitable for high throughput kinetic assays; this enabled rapid screening for improved and new activities from libraries of enzyme variants. Initial characterisation of several single site-saturation libraries targeted at active site residues of PETN reductase, are described. Two mutants (T26S and W102F) were shown to have switched in substrate enantiopreference against substrates (E)-2-aryl-1-nitropropene and α-methyl-trans-cinnamaldehyde, respectively, with an increase in ee (62 % (R) for W102F). In addition, the detection of mutants with weak activity against α,β-unsaturated carboxylic acid substrates showed progress in the expansion of the substrate range of PETN reductase. These methods can readily be adapted for rapid evolution of enzyme variants with other oxidoreductase enzymes.

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Organizational Affiliation: 

Faculty of Life Sciences, University of Manchester, 131 Princess Street, Manchester M1 7DN, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Pentaerythritol tetranitrate reductase	A	373	Enterobacter cloacae	Mutation(s): 0  Gene Names: onr, PETNR EC: 1.6.99.1
Find proteins for P71278 (Enterobacter cloacae) Explore P71278  Go to UniProtKB:  P71278

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FMN	A	FLAVIN MONONUCLEOTIDE C17 H21 N4 O9 P FVTCRASFADXXNN-SCRDCRAPSA-N
ACT	A	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.40 Å
• R-Value Free: 0.156 
• R-Value Work: 0.126 
• R-Value Observed: 0.127 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.961	α = 90
b = 68.954	β = 90
c = 88.476	γ = 90

Software Package:

Software Name	Purpose
SCALA	data scaling
MOLREP	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction
ADSC	data collection
MOSFLM	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2010-10-11 
• Released Date: 2010-11-24 
Deposition Author(s): Toogood, H.S., Hulley, M.E., Scrutton, N.S.

Revision History 

• Version 1.0: 2010-11-24
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance