Cited by 372Microbial metabolism and enzyme functionMetal-Catalyzed Oxygenation MechanismsPolyamine Metabolism and Applications

Carnitine metabolism to trimethylamine by an unusual Rieske-type oxygenase from human microbiota

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Zhu, Yijun, Jameson, Eleanor, Crosatti, Marialuisa, Schäfer, Hendrik, Rajakumar, Kumar, Bugg, Timothy D. H., Chen, Yin·2014·Proceedings of the National Academy of Sciences

Abstract

Significance: Metabolism of l -carnitine, a compound abundant in human diet, to trimethylamine by human microbiota has been shown to promote atherosclerosis and subsequent development of heart disease. However, the underpinning molecular and biochemical mechanisms remain unknown. In this study, we reveal that a previously unidentified Rieske-type protein is responsible for carnitine transformation to trimethylamine from human microbiota. Knowledge gained in our study provides the opportunity not only to explore Rieske protein inhibitors in preventing trimethylamine formation in animal studies and clinical trials, but also for its use as a functional genetic marker to better understand human microbiota and their dynamics in our health and disease in future epidemiological studies and dietary interventions.

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  • Gut microbes possess TMA lyases that cleave the C-N bond of choline/phosphatidylcholine and carnitine, releasing TMA.

    “While mammals do not have the enzyme, gut microbes have TMA lyases, which can cleave the C-N bond of these nutrients, releasing the TMA moiety as a waste product.”
  • Two distinct microbial enzyme systems have been identified in vitro that can produce TMA from either choline or carnitine.

    “Thus far, 2 distinct microbial enzyme systems have been identified in vitro that can produce TMA from either choline or carnitine as substrate (75,77).”
  • The microbial oxygenase CntA complexes with the reductase CntB to form an active complex that selectively uses carnitine and forms TMA, producing carnitine TMA lyase activity.

    “Similarly, a microbial oxygenase (CntA) complexes with the microbial reductase (CntB) to form an active complex that selectively uses carnitine as substrate and forms TMA (carnitine TMA lyase activity).”
  • Recombinant isolated CntA/B formed a two-component Rieske-type oxygenase/reductase complex.

    “Characterization of recombinant isolated CntA/B showed they formed a 2-component Rieske-type oxygenase/reductase complex (77).”
  • Using Acinetobacter baumannii as a model, an alternative microbial enzyme cluster CntA and CntB specific for carnitine TMA lyase activity was reported.

    “In other studies that used a similar bioinformatics approach with Acinetobacter baumannii as the model, an alternative microbial enzyme cluster (catalytic and regulatory protein CntA and CntB) specific for carnitine TMA lyase activity was also recently reported (77).”

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Authors
Zhu, Y., Jameson, E., Crosatti, M., Schäfer, H., Rajakumar, K., Bugg, T. D. H., & Chen, Y.
Affiliations
  • School of Life Sciences and
  • University of Leicester (GB)
  • University of Warwick (GB)
Venue
Proceedings of the National Academy of Sciences
Published
2014-03-03
Volume
111
Issue
11
Pages
4268-4273
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2000670099
Cited by
372
References
58
Citations by year
2026: 22 · 2025: 35 · 2024: 46 · 2023: 36 · 2022: 44 · 2021: 47 · 2020: 36 · 2019: 22 · 2018: 29 · 2017: 14 · 2016: 16 · 2015: 17 · 2014: 7
FWCI
7.34
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Warwick Research Archive Portal (University of Warwick) (acceptedVersion)
  • University of Birmingham Research Portal (University of Birmingham) (submittedVersion)
Funders
  • Royal Society
  • Natural Environment Research Council (NE/I027061/1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial metabolism and enzyme function
  • Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Polyamine Metabolism and Applications
Keywords
carnitine metabolism, trimethylamine, human gut microbiome, Acinetobacter baumannii, heterologous expression, trimethylamine N-oxide, cardiovascular disease, flavin-containing monooxygenase, gene clusters
MeSH terms
Carnitine, Chromatography, Ion Exchange, Escherichia coli, Humans, Methylamines, Oxidoreductases, Oxygenases, Spectrophotometry, Ultraviolet, Mutagenesis, Site-Directed, Computational Biology, Acinetobacter baumannii, Microbiota

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