Cited by 72Enzyme Production and CharacterizationMetalloenzymes and iron-sulfur proteinsEnzyme Structure and Function

Properties of a Thermostable Nitrate Reductase from the Hyperthermophilic Archaeon Pyrobaculum aerophilum

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Afshar, Sepideh, Johnson, Eric, de Vries, Simon, Schröder, Imke·2001·Journal of Bacteriology

Abstract

The nitrate reductase of the hyperthermophilic archaeon Pyrobaculum aerophilum was purified 137-fold from the cytoplasmic membrane. Based on sodium dodecyl sulfate-polyacrylamide gel electrophoresis analysis, the enzyme complex consists of three subunits with apparent molecular weights of 130,000, 52,000, and 32,000. The enzyme contained molybdenum (0.8-mol/mol complex), iron (15.4-mol/mol complex) and cytochrome b (0.49-mol/mol complex) as cofactors. The P. aerophilum nitrate reductase distinguishes itself from nitrate reductases of mesophilic bacteria and archaea by its very high specific activity using reduced benzyl viologen as the electron donor ( V max with nitrate, 1,162 s −1 (326 U/mg); V max with chlorate, 1,348 s −1 (378 U/mg) [assayed at 75°C]). The K m values for nitrate and chlorate were 58 and 140 μM, respectively. Azide was a competitive inhibitor and cyanide was a noncompetitive inhibitor of the nitrate reductase activity. The temperature optimum for activity was >95°C. When incubated at 100°C, the purified nitrate reductase had a half-life of 1.5 h. This study constitutes the first description of a nitrate reductase from a hyperthermophilic archaeon.

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Crossref · 10.1128/jb.183.19.5491-5495.2001

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  • The W-containing nitrate reductase from Pyrobaculum aerophilum, purified from cells grown in the presence of Mo and W, was reported to contain mostly Mo.

    “purified from cells grown in the presence of Mo and W, was reported to contain mostly Mo”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [208]

  • A functional W-containing nitrate reductase (Nar) has been isolated from an Achaea, Pyrobaculum aerophilum.

    “a functional W-containing nitrate reductase (Nar) has been isolated from an Achaea, Pyrobaculum aerophilum.208”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [208]

  • There is a natural selection of Mo in nitrate reductases.

    “indicating a natural selection of Mo in nitrate reductases.208,209”

    From Nitrate and periplasmic nitrate reductases (2014) · cites this paper as [208]

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Authors
Afshar, S., Johnson, E., de Vries, S., & Schröder, I.
Affiliations
  • University of California, Los Angeles (US)
  • <!--label omitted: 2-->Kluyver Department of Biotechnology, Delft University of Technology, 2628 BC Delft, The Netherlands2
  • <!--label omitted: 1-->Department of Microbiology and Molecular Genetics, University of California, Los Angeles, California 90095-1489,1 and
Venue
Journal of Bacteriology
Published
2001-10
Volume
183
Issue
19
Pages
5491-5495
ISSN
  • 0021-9193 (ISSN-L)
  • 1098-5530
OpenAlex
W2027145676
Cited by
72
References
22
Citations by year
2025: 2 · 2023: 4 · 2020: 3 · 2019: 3 · 2018: 1 · 2017: 3 · 2016: 3 · 2015: 4 · 2014: 6 · 2013: 4 · 2012: 2
FWCI
2.59
Type
journal article
Language
en
Open access
Locations
  • Journal of Bacteriology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Metalloenzymes and iron-sulfur proteins
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
nitrate reductase, Pyrobaculum aerophilum, hyperthermophilic archaea, thermostable enzymes, enzyme purification, enzyme subunits, molybdenum cofactor, cytochrome b, chlorate reduction, enzyme kinetics, azide inhibition, cyanide inhibition, thermal stability
MeSH terms
Enzyme Stability, Hydrogen-Ion Concentration, Kinetics, Molecular Weight, Molybdoferredoxin, Nitrate Reductases, Temperature, Thermoproteaceae, Protein Subunits, Nitrate Reductase

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