Inhibition of Proteasome Activities and Subunit-Specific Amino-Terminal Threonine Modification by Lactacystin
Abstract
Lactacystin is a Streptomyces metabolite that inhibits cell cycle progression and induces neurite outgrowth in a murine neuroblastoma cell line. Tritium-labeled lactacystin was used to identify the 20S proteasome as its specific cellular target. Three distinct peptidase activities of this enzyme complex (trypsin-like, chymotrypsin-like, and peptidylglutamyl-peptide hydrolyzing activities) were inhibited by lactacystin, the first two irreversibly and all at different rates. None of five other proteases were inhibited, and the ability of lactacystin analogs to inhibit cell cycle progression and induce neurite outgrowth correlated with their ability to inhibit the proteasome. Lactacystin appears to modify covalently the highly conserved amino-terminal threonine of the mammalian proteasome subunit X (also called MB1), a close homolog of the LMP7 proteasome subunit encoded by the major histocompatibility complex. This threonine residue may therefore have a catalytic role, and subunit X/MB1 may be a core component of an amino-terminal-threonine protease activity of the proteasome.
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These nucleophilic centers are also present in DNA and other biologically relevant compounds, such as glutathione.
“These nucleophilic centers are also present in DNA and other biologically relevant compounds, such as glutathione.116–121”
From Connecting metabolome and phenotype: recent advances in functional metabolomics tools for the identification of bioactive natural products (2024) · cites this paper as [117]
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- Authors
- Fenteany, G., Standaert, R. F., Lane, W. S., Choi, S., Corey, E. J., & Schreiber, S. L.
- Affiliations
- Howard Hughes Medical Institute (US)
- Venue
- Science
- Published
- 1995-05-05
- Volume
- 268
- Issue
- 5211
- Pages
- 726-731
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2066284211
- Cited by
- 1,583
- References
- 34
- Citations by year
- 2026: 8 · 2025: 18 · 2024: 12 · 2023: 13 · 2022: 13 · 2021: 21 · 2020: 20 · 2019: 23 · 2018: 20 · 2017: 24 · 2016: 22 · 2015: 25 · 2014: 35 · 2013: 34 · 2012: 34
- FWCI
- 38.03
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Science (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Protease and Inhibitor Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
- Keywords
- lactacystin, proteasome inhibition, 20S proteasome, LMP7, trypsin-like activity, chymotrypsin-like activity, cell cycle progression, neurite outgrowth, Streptomyces metabolites, covalent modification
- MeSH terms
- Acetylcysteine, Amino Acid Sequence, Animals, Carrier Proteins, Cattle, Chromatography, High Pressure Liquid, Cysteine Endopeptidases, Electrophoresis, Polyacrylamide Gel, Molecular Sequence Data, Multienzyme Complexes, Nerve Tissue Proteins, Neurons, Threonine, Tumor Cells, Cultured, Cysteine Proteinase Inhibitors, Proteasome Endopeptidase Complex, Mice
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