5N8H

Serial Cu nitrite reductase structures at elevated cryogenic temperature, 240K. Dataset 3.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.146 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Active-site protein dynamics and solvent accessibility in native Achromobacter cycloclastes copper nitrite reductase.

Sen, K.Horrell, S.Kekilli, D.Yong, C.W.Keal, T.W.Atakisi, H.Moreau, D.W.Thorne, R.E.Hough, M.A.Strange, R.W.

(2017) IUCrJ 4: 495-505

  • DOI: https://doi.org/10.1107/S2052252517007527
  • Primary Citation of Related Structures:  
    5N8F, 5N8G, 5N8H, 5N8I

  • PubMed Abstract: 

    Microbial nitrite reductases are denitrifying enzymes that are a major component of the global nitrogen cycle. Multiple structures measured from one crystal (MSOX data) of copper nitrite reductase at 240 K, together with molecular-dynamics simulations, have revealed protein dynamics at the type 2 copper site that are significant for its catalytic properties and for the entry and exit of solvent or ligands to and from the active site. Molecular-dynamics simulations were performed using different protonation states of the key catalytic residues (Asp CAT and His CAT ) involved in the nitrite-reduction mechanism of this enzyme. Taken together, the crystal structures and simulations show that the Asp CAT protonation state strongly influences the active-site solvent accessibility, while the dynamics of the active-site 'capping residue' (Ile CAT ), a determinant of ligand binding, are influenced both by temperature and by the protonation state of Asp CAT . A previously unobserved conformation of Ile CAT is seen in the elevated temperature series compared with 100 K structures. DFT calculations also show that the loss of a bound water ligand at the active site during the MSOX series is consistent with reduction of the type 2 Cu atom.


  • Organizational Affiliation

    School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester CO4 3SQ, England.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Copper-containing nitrite reductase334Achromobacter cycloclastesMutation(s): 0 
Gene Names: nirK
EC: 1.7.2.1
UniProt
Find proteins for P25006 (Achromobacter cycloclastes)
Explore P25006 
Go to UniProtKB:  P25006
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP25006
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.65 Å
  • R-Value Free: 0.170 
  • R-Value Work: 0.144 
  • R-Value Observed: 0.146 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.204α = 90
b = 96.204β = 90
c = 96.204γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
REFMACphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/M020924/1
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/M022714/1

Revision History  (Full details and data files)

  • Version 1.0: 2017-07-26
    Type: Initial release
  • Version 1.1: 2017-09-20
    Changes: Database references
  • Version 1.2: 2024-01-17
    Changes: Data collection, Database references, Derived calculations, Refinement description