1Q16

Crystal structure of Nitrate Reductase A, NarGHI, from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Insights into the respiratory electron transfer pathway from the structure of nitrate reductase A

Bertero, M.G.Rothery, R.A.Palak, M.Hou, C.Lim, D.Blasco, F.Weiner, J.H.Strynadka, N.C.J.

(2003) Nat.Struct.Mol.Biol. 10: 681-687

  • DOI: 10.1038/nsb969

  • PubMed Abstract: 
  • The facultative anaerobe Escherichia coli is able to assemble specific respiratory chains by synthesis of appropriate dehydrogenases and reductases in response to the availability of specific substrates. Under anaerobic conditions in the presence of ...

    The facultative anaerobe Escherichia coli is able to assemble specific respiratory chains by synthesis of appropriate dehydrogenases and reductases in response to the availability of specific substrates. Under anaerobic conditions in the presence of nitrate, E. coli synthesizes the cytoplasmic membrane-bound quinol-nitrate oxidoreductase (nitrate reductase A; NarGHI), which reduces nitrate to nitrite and forms part of a redox loop generating a proton-motive force. We present here the crystal structure of NarGHI at a resolution of 1.9 A. The NarGHI structure identifies the number, coordination scheme and environment of the redox-active prosthetic groups, a unique coordination of the molybdenum atom, the first structural evidence for the role of an open bicyclic form of the molybdo-bis(molybdopterin guanine dinucleotide) (Mo-bisMGD) cofactor in the catalytic mechanism and a novel fold of the membrane anchor subunit. Our findings provide fundamental molecular details for understanding the mechanism of proton-motive force generation by a redox loop.


    Organizational Affiliation

    Department of Biochemistry, University of British Columbia, 2146 Health Sciences Mall, Vancouver, British Columbia V6T 1Z3, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Respiratory nitrate reductase 1 alpha chain
A
1247Escherichia coli (strain K12)Gene Names: narG (bisD, narC)
EC: 1.7.5.1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Oxidoreductases
Protein: 
NarGHI Nitrate Reductase A
Find proteins for P09152 (Escherichia coli (strain K12))
Go to UniProtKB:  P09152
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Respiratory nitrate reductase 1 beta chain
B
512Escherichia coli (strain K12)Gene Names: narH
EC: 1.7.5.1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Oxidoreductases
Protein: 
NarGHI Nitrate Reductase A
Find proteins for P11349 (Escherichia coli (strain K12))
Go to UniProtKB:  P11349
Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
Respiratory nitrate reductase 1 gamma chain
C
225Escherichia coli (strain K12)Gene Names: narI (chlI)
EC: 1.7.5.1
Membrane protein
mpstruct
Group: 
TRANSMEMBRANE PROTEINS: ALPHA-HELICAL
Sub Group: 
Oxidoreductases
Protein: 
NarGHI Nitrate Reductase A
Find proteins for P11350 (Escherichia coli (strain K12))
Go to UniProtKB:  P11350
Small Molecules
Ligands 7 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
SF4
Query on SF4

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Download CCD File 
A, B
IRON/SULFUR CLUSTER
Fe4 S4
LJBDFODJNLIPKO-VKOJMFJBAC
 Ligand Interaction
AGA
Query on AGA

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A
(1S)-2-{[{[(2S)-2,3-DIHYDROXYPROPYL]OXY}(HYDROXY)PHOSPHORYL]OXY}-1-[(PENTANOYLOXY)METHYL]ETHYL OCTANOATE
PHOSPHATIDYL GLYCEROL
C19 H36 O10 P
UQSXQYRZHMGKIE-DLBZAZTESA-M
 Ligand Interaction
F3S
Query on F3S

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B
FE3-S4 CLUSTER
Fe3 S4
FCXHZBQOKRZXKS-MZMDZPPWAW
 Ligand Interaction
MD1
Query on MD1

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A
PHOSPHORIC ACID 4-(2-AMINO-4-OXO-3,4,5,6,-TETRAHYDRO-PTERIDIN-6-YL)-2-HYDROXY-3,4-DIMERCAPTO-BUT-3-EN-YL ESTER GUANYLATE ESTER
C20 H26 N10 O13 P2 S2
IRGDLSAXQOKWLX-XHEYTWMPSA-N
 Ligand Interaction
3PH
Query on 3PH

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B
1,2-DIACYL-GLYCEROL-3-SN-PHOSPHATE
PHOSPHATIDIC ACID
C39 H77 O8 P
YFWHNAWEOZTIPI-DIPNUNPCSA-N
 Ligand Interaction
HEM
Query on HEM

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C
PROTOPORPHYRIN IX CONTAINING FE
HEME
C34 H32 Fe N4 O4
KABFMIBPWCXCRK-RGGAHWMASA-L
 Ligand Interaction
6MO
Query on 6MO

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A
MOLYBDENUM(VI) ION
Mo
HCNGUXXTNNIKCQ-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
FME
Query on FME
C
L-PEPTIDE LINKINGC6 H11 N O3 SMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.9 Å
  • R-Value Free: 0.230 
  • R-Value Work: 0.202 
  • Space Group: C 2 2 21
Unit Cell:
Length (Å)Angle (°)
a = 154.175α = 90.00
b = 241.376β = 90.00
c = 139.494γ = 90.00
Software Package:
Software NamePurpose
CNSrefinement
RESOLVEphasing
SOLVEphasing
DENZOdata reduction
SHARPphasing
CNSphasing
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2003-10-07
    Type: Initial release
  • Version 1.1: 2008-04-29
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance