Cited by 105Bacterial Genetics and BiotechnologyMicrobial metabolism and enzyme functionEnzyme Structure and Function

Biochemical and genetic characterization of the membrane‐associated malate dehydrogenase (acceptor) from Corynebacterium glutamicum

Open access
Molenaar, Douwe, van der Rest, Michel E., Petrović, Sonja·1998·European Journal of Biochemistry

Abstract

In addition to a cytoplasmic, NAD‐dependent malate dehydrogenase ( EC1.1.1.37), Corynebacterium glutamicum possesses a highly active membrane‐associated malate dehydrogenase (acceptor) ( EC1.1.99.16). This enzyme also takes part in the citric acid cycle. It oxidizes L‐malate to oxaloacetate and donates electrons to ubiquinone‐1 and other artificial acceptors or, via the electron transfer chain, to oxygen. NAD is not an acceptor and the natural direct acceptor for the enzyme is most likely a quinone. The enzyme is therefore called malate :quinone oxidoreductase, abbreviated to Mqo. Mqo is a peripheral membrane protein and can be released from the membrane by addition of chelators. The solubilized form was partially purified and characterized biochemically. FAD is probably a tightly but non‐covalently bound prosthetic group, and the enzyme is activated by lipids. A C. glutamicum mutant completely lacking Mqo activity was isolated. It grows poorly on several substrates tested. The mutant possesses normal levels of cytoplasmic NAD‐dependent malate dehydrogenase. A plasmid containing the gene from C. glutamicum coding for Mqo was isolated by complementation of the Mqo‐negative phenotype. It leads to overexpression of Mqo activity in the mutant. The nucleotide sequence of the mqo gene was determined and is the first sequence known for this enzyme. The derived protein sequence is similar to hypothetical proteins from Escherichia coli, Klebsiella pneumoniae, and Mycobacterium tuberculosis.

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.1046/j.1432-1327.1998.2540395.x

Cites

3 of 3 references verified0 citation errors · 0 not checkable

Statistics

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Membrane-associated malate quinone oxidoreductase oxidizes malate to oxaloacetate and transfers reducing equivalents to menaquinone.

    “The membrane-associated malate quinone oxidoreductase (MQO) oxidizes malate to oxaloacetate and transfers the reducing equivalents to menaquinone (MK) (59, 60) (Figure 3).”

    From Energetics of Respiration and Oxidative Phosphorylation in Mycobacteria (2014) · cites this paper as [60]

    The introductory passage and the L-malate oxidation section state that Mqo oxidizes malate to oxaloacetate and donates electrons at the quinone pool; the latter section demonstrates reduction of ubiquinone-1. The paper does not establish menaquinone specifically as the electron acceptor: it says the natural direct acceptor is most likely a quinone, while menaquinone-4 did not stimulate activity in the reported assay. No page number is available in our copy. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Cites

Flagged first, then by citations

2 of the 5 references couldn’t be matched to a known paper.

Research works printed but not linked: 4

  1. Abe, S., Takayama, K. & Kinoshita, S. (1967) J. Gen. Appl. Micro- of both a NAD-dependent malate dehydrogenase and a Mqo is biol. 13, 279Ϫ301. unclear. However, it should be borne in mind that the Gibbs 20. Vrljic ´, M., Sahm, H. & Eggeling, L. (1996) Mol. Microbiol. 22, standard free energies for both reactions differ dramatically. 815Ϫ826. Whereas the NAD-dependent reaction has a highly unfavourable 21. Menkel, E., Thierbach, G., Eggeling, L. & Sahm, H. (1989) Appl. Environ. Microbiol. 55, 684Ϫ688. ∆G°′ for oxaloacetate formation equal to ϩ28.6 kJ/mol, the 14321033, 1998, 2, Downloaded from https://febs.onlinelibrary.wiley.com/doi/10.1046/j.1432-1327.1998.2540395.x, Wiley Online Library on [23/06/2026]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License
  2. Wendisch, V. F. (1997) Thesis, Heinrich-Heine-Universität, Düssel- 31.
  3. Sanger, F., Nicklen, S. & Coulson, A. R. (1977) Proc. Natl Acad. Sci. USA 74, 5463Ϫ5467. 187, 101Ϫ107.
  4. Davis, K. A. & Hatefi, Y. (1972) Arch. Biochem. Biophys. 149, 39. Thauer, R. K., Jungermann, K. & Decker, K. (1977) Bacteriol. Rev. 41, 100Ϫ180. 505Ϫ512. 14321033, 1998, 2, Downloaded from https://febs.onlinelibrary.wiley.com/doi/10.1046/j.1432-1327.1998.2540395.x, Wiley Online Library on [23/06/2026]. See the Terms and Conditions (https://onlinelibrary.wiley.com/terms-and-conditions) on Wiley Online Library for rules of use; OA articles are governed by the applicable Creative Commons License

Cited by

Sorted by citations

Authors
Molenaar, D., van der Rest, M. E., & Petrović, S.
Affiliations
Heinrich Heine University Düsseldorf (DE)
Venue
European Journal of Biochemistry
Publisher
Wiley
Published
1998-06
Volume
254
Issue
2
Pages
395-403
ISSN
  • 0014-2956 (ISSN-L)
  • 1432-1033
OpenAlex
W2042795207
Cited by
105
References
5
Citations by year
2026: 2 · 2025: 4 · 2024: 1 · 2023: 3 · 2022: 3 · 2021: 5 · 2020: 2 · 2019: 4 · 2018: 2 · 2017: 1 · 2016: 7 · 2015: 4 · 2014: 7 · 2013: 2 · 2012: 8
FWCI
1.71
Type
journal article
Language
en
Open access
Locations
  • European Journal of Biochemistry (publishedVersion)
  • PubMed (publishedVersion)
  • VU Research Portal (submittedVersion)
  • Data Archiving and Networked Services (DANS) (submittedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial metabolism and enzyme function
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
malate:quinone oxidoreductase, Corynebacterium glutamicum, TCA cycle, FAD prosthetic group, quinone acceptors, peripheral membrane proteins, gene complementation, NAD-dependent malate dehydrogenase, protein sequence similarity
MeSH terms
Amino Acid Sequence, Base Sequence, Cloning, Molecular, Corynebacterium, Enzyme Activation, Flavin-Adenine Dinucleotide, Genes, Bacterial, Lipids, Malate Dehydrogenase, Malates, Membranes, Molecular Sequence Data, Mutation, Oligodeoxyribonucleotides, Oxaloacetates, Oxidation-Reduction, Solubility, Substrate Specificity, Ubiquinone, Sequence Homology, Amino Acid

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review