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Methionine in proteins defends against oxidative stress
Open accessAbstract
A variety of reactive oxygen species react readily with methionine residues in proteins to form methionine sulfoxide, thus scavenging the reactive species. Most cells contain methionine sulfoxide reduc‐tases, which catalyze a thioredoxin‐dependent reduction of methionine sulfoxide back to methionine. Thus, methionine residues may act as catalytic antioxidants, protecting both the protein where they are located and other macromolecules. To test this hypothesis directly, we replaced 40% of the methionine residues in Escherichia coli with norleucine, the carbon‐containing analog, in which the sulfur of methionine is substituted by a methylene group (‐CH2‐). The intracellular free methionine and S ‐adenosylmethionine pools were not altered, nor was the specific activity of the key enzyme, glutamine synthetase. When unstressed, both control and norleucine‐substituted cells survived equally well at stationary phase for at least 32 h. However, oxidative stress was more damaging to the norleucine‐substituted cells. They died more rapidly than control cells when challenged by hypochlorite, hydrogen peroxide, or ionizing radiation. One of the most abundant proteins in the cell, elongation factor Tu, was found to be more oxidatively modified in norleucine‐substituted cells, consistent with loss of the antioxidant defense provided by methionine residues. The results of these studies support the hypothesis that methionine in protein acts as an endogenous antioxidant in cells.—Luo, S., Levine, R. L. Methionine in proteins defends against oxidative stress. FASEB J. 23, 464‐472 (2009)
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Kallifidas, D., Thomas, D., Doughty, P., & Paget, M. S. B. (2010) · Microbiology · doi:10.1099/mic.0.037804-0 · Cited by 53
Tarrago, L., & Gladyshev, V. N. (2012) · Biochemistry (Moscow) · doi:10.1134/s0006297912100021 · Cited by 43
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The selenoprotein methionine sulfoxide reductase B1 (MSRB1)
Tarrago, L., Kaya, A., Kim, H.-Y., Manta, B., Lee, B.-C., & Gladyshev, V. N. (2022) · Free Radical Biology and Medicine · doi:10.1016/j.freeradbiomed.2022.08.043 · Cited by 39
Metadata
- Authors
- Luo, S., & Levine, R. L.
- Venue
- The FASEB Journal
- Publisher
- Wiley
- Published
- 2008-10-09
- Volume
- 23
- Issue
- 2
- Pages
- 464-472
- ISSN
- 0892-6638 (ISSN-L)
- 1530-6860
- OpenAlex
- W2070623737
- Cited by
- 461
- References
- 3
- FWCI
- 6.08
- Type
- journal article
- Language
- en
- Open access
- green
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