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Krebs and his trinity of cycles

Kornberg, Hans·2000·Nature Reviews Molecular Cell Biology

Abstract

Everyone who has ever taken biology at school has heard of the Krebs cycle, but few realize that Hans Krebs also discovered two other cycles. It is appropriate, at the centenary of his birth, to consider the circumstances and experiments that led Krebs to establish these metabolic pathways.

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Crossref · 10.1038/35043073

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  • In 1937, Hans Krebs showed that succinate could be synthesized by animal tissues in the presence of pyruvate.

    “In 1937, Hans Krebs (1, 32) showed that succinate could be synthesized by animal tissues in the presence of pyruvate, leading him to speculate that succinate may arise from citrate oxidation downstream of pyruvate.”
  • In 1935, Szent-Györgyi worked out the sequence of reactions from succinate to fumarate to malate to OAA and demonstrated rapid oxidation of these substances by pigeon muscle suspensions.

    “In 1935, Szent-Györgyi worked out the sequence of reactions from succinate to fumarate to malate to OAA and demonstrated the rapid oxidation of these substances by pigeon muscle suspensions (31, 32).”
  • Krebs and Johnson found that citrate did not disappear during this process, indicating it was being continuously reformed.

    “Moreover, they found that citrate did not disappear during this process, indicating that it was being continuously reformed (2, 32).”
  • By adding malonate, an inhibitor of succinate oxidation, Krebs and Johnson found that succinate accumulated when OAA was added to muscle, implying the series of reactions was cyclical.

    “By adding malonate, an inhibitor of succinate oxidation, they found that succinate accumulated when OAA was added to muscle, implying that this series of reactions was cyclical in nature (2, 32).”

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Authors
Kornberg, H.
Affiliations
Boston University (US)
Corresponding author
Kornberg, Hans
Venue
Nature Reviews Molecular Cell Biology
Published
2000-12
Volume
1
Issue
3
Pages
225-228
ISSN
  • 1471-0072 (ISSN-L)
  • 1471-0080
OpenAlex
W1598906599
Cited by
86
References
23
Citations by year
2026: 7 · 2025: 2 · 2024: 2 · 2023: 4 · 2022: 7 · 2021: 2 · 2020: 6 · 2019: 7 · 2018: 12 · 2017: 3 · 2016: 2 · 2015: 8 · 2014: 4 · 2013: 4 · 2012: 6
FWCI
0.22
Type
journal article
Language
en
Open access
closed
Locations
  • Nature Reviews Molecular Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Social Sciences › Arts and Humanities › History and Philosophy of Science › History of Science and Medicine
  • Social Sciences › Arts and Humanities › History › Biographical and Historical Analysis
  • Social Sciences › Arts and Humanities › History › Medical History and Innovations
Keywords
Hans Krebs, TCA cycle, history of biochemistry, metabolic pathways, centenary of birth, scientific discovery
MeSH terms
Biochemistry, Citric Acid Cycle, Glyoxylates, Humans, Ornithine, History, 20th Century

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