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A heterodetic cyclic peptide, in which the cyclisation step involves a formal lactonisation between the carboxy group of a quinaldic acid-based residue and a secondary alcohol. An antibiotic that inhibits bacterial protein synthesis. Also acts as an antitumor agent." []

Thiostrepton is a natural cyclic oligopeptide antibiotic, derived from several strains of streptomycetes including Streptomyces azureus and Streptomyces laurentii. Thiostrepton is a natural product of the ribosomally synthesized and post-translationally modified peptide class. NA is a natural product found in Streptomyces azureus, Streptomyces coeruleorubidus, and Streptomyces laurentii with data available. Thiostrepton is a naturally-occurring, sulfur-rich, cyclic oligopeptide antibiotic of the thiopeptide class, and an irreversible inhibitor of the mitochondrial thioredoxin-dependent peroxide reductase (peroxiredoxin-3; PRX3; antioxidant protein 1; AOP-1), with potential antineoplastic activity. Upon intrapleural administration, thiostrepton irreversibly binds to and inhibits the activity of PRX3. This inhibits the peroxidase activity of the thioredoxin reductase 2 (TXNRD2)-thioredoxin-2 (TRX2)-PRX3 antioxidant signaling network within the mitochondria, which may result in the accumulation of hydrogen peroxide and lead to tumor cell death. PRX3 is upregulated in cancer cells and plays an important role in the regulation of the oxidative stress pathways. One of the CYCLIC PEPTIDES from Streptomyces that is active against gram-positive bacteria. In veterinary medicine, it has been used in mastitis caused by gram-negative organisms and in dermatologic disorders.