Why Nature Chose Selenium
Abstract
The authors were asked by the Editors of ACS Chemical Biology to write an article titled "Why Nature Chose Selenium" for the occasion of the upcoming bicentennial of the discovery of selenium by the Swedish chemist Jöns Jacob Berzelius in 1817 and styled after the famous work of Frank Westheimer on the biological chemistry of phosphate [Westheimer, F. H. (1987) Why Nature Chose Phosphates, Science 235, 1173-1178]. This work gives a history of the important discoveries of the biological processes that selenium participates in, and a point-by-point comparison of the chemistry of selenium with the atom it replaces in biology, sulfur. This analysis shows that redox chemistry is the largest chemical difference between the two chalcogens. This difference is very large for both one-electron and two-electron redox reactions. Much of this difference is due to the inability of selenium to form π bonds of all types. The outer valence electrons of selenium are also more loosely held than those of sulfur. As a result, selenium is a better nucleophile and will react with reactive oxygen species faster than sulfur, but the resulting lack of π-bond character in the Se-O bond means that the Se-oxide can be much more readily reduced in comparison to S-oxides. The combination of these properties means that replacement of sulfur with selenium in nature results in a selenium-containing biomolecule that resists permanent oxidation. Multiple examples of this gain of function behavior from the literature are discussed.
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Most human selenoproteins are oxidoreductases containing selenocysteine at their catalytic site.
“Most of the human selenoproteins are oxidoreductases containing the amino acid selenocysteine (SeCys) at their catalytic site [439].”
From The Role of Antioxidants in the Interplay between Oxidative Stress and Senescence (2022) · cites this paper as [439]
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Targeting the Thioredoxin System for Cancer Therapy
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The Role of Antioxidants in the Interplay between Oxidative Stress and Senescence
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- Authors
- Reich, H. J., & Hondal, R. J.
- Affiliations
- University of Wisconsin–Madison (US)
- University of Vermont (US)
- Corresponding author
- Reich, Hans J.
- Hondal, Robert J.
- ORCID
- Hondal, Robert J.
- Venue
- ACS Chemical Biology
- Publisher
- American Chemical Society (ACS)
- Published
- 2016-03-21
- Volume
- 11
- Issue
- 4
- Pages
- 821-841
- ISSN
- 1554-8929 (ISSN-L)
- 1554-8937
- OpenAlex
- W2294386056
- Cited by
- 923
- References
- 269
- Citations by year
- 2026: 84 · 2025: 115 · 2024: 113 · 2023: 111 · 2022: 117 · 2021: 84 · 2020: 79 · 2019: 76 · 2018: 81 · 2017: 49 · 2016: 13
- FWCI
- 11.13
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ACS Chemical Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Vanderbilt University
- University of Vermont
- Università degli Studi dell'Aquila
- Topics
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Toxicology › Organoselenium and organotellurium chemistry
- Health Sciences › Nursing › Nutrition and Dietetics › Selenium in Biological Systems
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
- Keywords
- selenium, sulfur, chalcogens, redox chemistry, π-bonding, nucleophilicity, reactive oxygen species, oxidation resistance
- MeSH terms
- Deficiency Diseases, Humans, Neoplasms, Selenium, Nature
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