4ZK8

Copper-containing nitrite reductase from thermophilic bacterium Geobacillus thermodenitrificans (Re-refined)


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.15 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.120 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Literature

Structural insights into the function of a thermostable copper-containing nitrite reductase

Fukuda, Y.Tse, K.M.Lintuluoto, M.Fukunishi, Y.Mizohata, E.Matsumura, H.Takami, H.Nojiri, M.Inoue, T.

(2014) J.Biochem. 155: 123-135

  • DOI: 10.1093/jb/mvt107

  • PubMed Abstract: 
  • Copper-containing nitrite reductase (CuNIR) catalyzes the reduction of nitrite (NO(-)2) to nitric oxide (NO) during denitrification. We determined the crystal structures of CuNIR from thermophilic gram-positive bacterium, Geobacillus thermodenitrific ...

    Copper-containing nitrite reductase (CuNIR) catalyzes the reduction of nitrite (NO(-)2) to nitric oxide (NO) during denitrification. We determined the crystal structures of CuNIR from thermophilic gram-positive bacterium, Geobacillus thermodenitrificans (GtNIR) in chloride- and formate-bound forms of wild type at 1.15 Å resolution and the nitrite-bound form of the C135A mutant at 1.90 Å resolution. The structure of C135A with nitrite displays a unique η(1)-O coordination mode of nitrite at the catalytic copper site (T2Cu), which has never been observed at the T2Cu site in known wild-type CuNIRs, because the mobility of two residues essential to catalytic activity, Asp98 and His244, are sterically restricted in GtNIR by Phe109 on a characteristic loop structure that is found above Asp98 and by an unusually short CH-O hydrogen bond observed between His244 and water, respectively. A detailed comparison of the WT structure with the nitrite-bound C135A structure implies the replacement of hydrogen-bond networks around His244 and predicts the flow path of protons consumed by nitrite reduction. On the basis of these observations, the reaction mechanism of GtNIR through the η(1)-O coordination manner is proposed.


    Organizational Affiliation

    Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Department of Chemistry, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan; Department of Applied Chemistry, School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan; Faculty of Life and Environmental Sciences, Department of Environmental Information, Kyoto Prefectural University, Shimogamo-Hanki-cho, Sakyou, Kyoto 606-8522, Japan; Molecular-Recognition Structure Analysis Team, Molecular Profiling Research Center for Drug Discovery (molprof) National Institute of Advanced Industrial Science and Technology (AIST) 2-3-26 Aomi, Koto-ku, Tokyo 135-0064, Japan; Microbial Genome Research Group, Japan Agency of Marine-Earth Science and Technology, 2-15 Natsushima, Yokosuka, Kanagawa 237-0061, Japan; and RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Nitrite reductase
A
323Geobacillus thermodenitrificans (strain NG80-2)Mutation(s): 0 
Gene Names: nirK
Find proteins for A4IL26 (Geobacillus thermodenitrificans (strain NG80-2))
Go to UniProtKB:  A4IL26
Small Molecules
Ligands 8 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SO4
Query on SO4

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A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
CL
Query on CL

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A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

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A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
CU
Query on CU

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A
COPPER (II) ION
Cu
JPVYNHNXODAKFH-UHFFFAOYSA-N
 Ligand Interaction
PEG
Query on PEG

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A
DI(HYDROXYETHYL)ETHER
C4 H10 O3
MTHSVFCYNBDYFN-UHFFFAOYSA-N
 Ligand Interaction
ACY
Query on ACY

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A
ACETIC ACID
C2 H4 O2
QTBSBXVTEAMEQO-UHFFFAOYSA-N
 Ligand Interaction
MPD
Query on MPD

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A
(4S)-2-METHYL-2,4-PENTANEDIOL
C6 H14 O2
SVTBMSDMJJWYQN-YFKPBYRVSA-N
 Ligand Interaction
TRS
Query on TRS

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A
2-AMINO-2-HYDROXYMETHYL-PROPANE-1,3-DIOL
TRIS BUFFER
C4 H12 N O3
LENZDBCJOHFCAS-UHFFFAOYSA-O
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.15 Å
  • R-Value Free: 0.146 
  • R-Value Work: 0.120 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 115.054α = 90.00
b = 115.054β = 90.00
c = 84.417γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MOLREPphasing
HKL-2000data reduction
REFMACrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2015-04-30 
  • Released Date: 2015-05-20 
  • Deposition Author(s): Fukuda, Y., Inoue, T.
  • This entry supersedes: 3WKO

Funding OrganizationLocationGrant Number
Japan Society for the Promotion of ScienceJapan254626

Revision History 

  • Version 1.0: 2015-05-20
    Type: Initial release