5OG5

Cu nitrite reductase serial data at varying temperatures RT 0.21MGy

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 

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Literature

Enzyme catalysis captured using multiple structures from one crystal at varying temperatures.

Horrell, S., Kekilli, D., Sen, K., Owen, R.L., Dworkowski, F.S.N., Antonyuk, S.V., Keal, T.W., Yong, C.W., Eady, R.R., Hasnain, S.S., Strange, R.W., Hough, M.A.

(2018) IUCrJ 5: 283-292

  • DOI: 10.1107/S205225251800386X
  • Primary Citation of Related Structures:  
    5OFE, 5OFD, 5OFG, 5OFF, 5OFH, 5OFC, 5OF5, 5OF7, 5OF6, 5OF8

  • PubMed Abstract: 

    • High-resolution crystal structures of enzymes in relevant redox states have transformed our understanding of enzyme catalysis. Recent developments have demonstrated that X-rays can be used, via the generation of solvated electrons, to drive ...

    High-resolution crystal structures of enzymes in relevant redox states have transformed our understanding of enzyme catalysis. Recent developments have demonstrated that X-rays can be used, via the generation of solvated electrons, to drive reactions in crystals at cryogenic temperatures (100 K) to generate 'structural movies' of enzyme reactions. However, a serious limitation at these temperatures is that protein conformational motion can be significantly supressed. Here, the recently developed MSOX (multiple serial structures from one crystal) approach has been applied to nitrite-bound copper nitrite reductase at room temperature and at 190 K, close to the glass transition. During both series of multiple structures, nitrite was initially observed in a 'top-hat' geometry, which was rapidly transformed to a 'side-on' configuration before conversion to side-on NO, followed by dissociation of NO and substitution by water to reform the resting state. Density functional theory calculations indicate that the top-hat orientation corresponds to the oxidized type 2 copper site, while the side-on orientation is consistent with the reduced state. It is demonstrated that substrate-to-product conversion within the crystal occurs at a lower radiation dose at 190 K, allowing more of the enzyme catalytic cycle to be captured at high resolution than in the previous 100 K experiment. At room temperature the reaction was very rapid, but it remained possible to generate and characterize several structural states. These experiments open up the possibility of obtaining MSOX structural movies at multiple temperatures (MSOX-VT), providing an unparallelled level of structural information during catalysis for redox enzymes.

    Organizational Affiliation: 

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



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Copper-containing nitrite reductaseA334Achromobacter cycloclastesMutation(s): 0 
Gene Names: nirK
EC: 1.7.2.1
Find proteins for P25006 (Achromobacter cycloclastes)
Explore P25006 
Go to UniProtKB:  P25006
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.82 Å
  • R-Value Free: 0.209 
  • R-Value Work: 0.174 
  • R-Value Observed: 0.175 
  • Space Group: P 21 3
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.252α = 90
b = 96.252β = 90
c = 96.252γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
DIALSdata collection
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/M022714/1
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/M020924/1
Leverhulme TrustUnited KingdomRPG-2014-355

Revision History 

  • Version 1.0: 2018-05-23
    Type: Initial release