Cited by 149Metalloenzymes and iron-sulfur proteinsEnzyme Structure and FunctionHemoglobin structure and function

Structural and redox plasticity in the heterodimeric periplasmic nitrate reductase

Arnoux, Pascal, Sabaty, Monique, Alric, Jean, Frangioni, Bettina, Guigliarelli, Bruno, Adriano, Jean-Marc, Pignol, David·2003·Nature Structural & Molecular Biology

Abstract

The structure of the respiratory nitrate reductase (NapAB) from Rhodobacter sphaeroides, the periplasmic heterodimeric enzyme responsible for the first step in the denitrification process, has been determined at a resolution of 3.2 A. The di-heme electron transfer small subunit NapB binds to the large subunit with heme II in close proximity to the [4Fe-4S] cluster of NapA. A total of 57 residues at the N- and C-terminal extremities of NapB adopt an extended conformation, embracing the NapA subunit and largely contributing to the total area of 5,900 A(2) buried in the complex. Complex formation was studied further by measuring the variation of the redox potentials of all the cofactors upon binding. The marked effects observed are interpreted in light of the three-dimensional structure and depict a plasticity that contributes to an efficient electron transfer in the complex from the heme I of NapB to the molybdenum catalytic site of NapA.

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Crossref · 10.1038/nsb994

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  • The crystal structures of NapA from Cupriavidus necator (PDB ID: 3ML1), E. coli (PDB ID: 2NYA), R. sphaeroides (PDB ID: 1OGY), and D. desulfuricans (PDB ID: 2NAP) have been reported.

    “The crystal structures of NapA from several species have been reported: Cupriavidus necator (PDB ID: 3ML1),121 E. coli (PDB ID: 2NYA),96 R. sphaeroides (PDB ID: 1OGY),186 and D. desulfuricans (PDB ID: 2NAP).119”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [186]

  • Tyrosine-58 in R. sphaeroides NapA participates in electron transfer from NapB to the [4Fe-4S] cluster of NapA.

    “the tyrosine-58 in R. sphaeroides participates in electron transfer from NapB to the [4Fe–4S] cluster of NapA”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [186]

  • Tyrosine-58 is conserved in all heterodimeric NapA but absent in monomeric NapA such as D. desulfuricans.

    “conserved in all heterodimeric NapA, but absent in monomeric NapA such as D. desulfuricans.186”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [186]

  • In addition to four dithiolene sulfurs, a fifth sulfur ligand derived from a conserved cysteine residue coordinates the Mo in the active site of NapA.

    “In addition to four dithiolene sulfurs, a fifth sulfur ligand derived from a conserved cysteine residue coordinates the Mo in the active site of NapA.96,119,186”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [186]

  • Removal of NapB from the NapAB complex reduces the efficiency of the monomer only 4-6 fold in R. sphaeroides but 30 fold in Thiosphaera pantotropha.

    “Removal of NapB from the NapAB complex reduces the efficiency of the monomer only 4–6 fold in R. sphaeroides186 but 30 fold in Thiosphaera pantotropha.214”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [186]

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Authors
Arnoux, P., Sabaty, M., Alric, J., Frangioni, B., Guigliarelli, B., Adriano, J.-M., & Pignol, D.
Affiliations
  • Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR)
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
  • Arnoux, Pascal
  • Pignol, David
Venue
Nature Structural & Molecular Biology
Published
2003-10-05
Volume
10
Issue
11
Pages
928-934
ISSN
  • 1545-9985 (ISSN-L)
  • 1545-9993
OpenAlex
W2067813138
Cited by
149
References
37
Citations by year
2026: 5 · 2025: 5 · 2024: 7 · 2023: 5 · 2022: 5 · 2021: 5 · 2020: 9 · 2019: 7 · 2018: 5 · 2017: 4 · 2016: 3 · 2015: 5 · 2014: 7 · 2013: 13 · 2012: 4
FWCI
5.99
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Structural & Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
European Synchrotron Radiation Facility
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Hemoglobin structure and function
Keywords
periplasmic nitrate reductase, Rhodobacter sphaeroides, heterodimeric enzyme, denitrification, [4Fe-4S] cluster, redox potential, electron transfer, structural plasticity, protein complex structure, cofactor binding
MeSH terms
Kinetics, Nitrate Reductases, Oxidation-Reduction, Rhodobacter sphaeroides, Protein Structure, Tertiary, Dimerization, Protein Structure, Quaternary, Periplasmic Proteins, Nitrate Reductase

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