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Napyradiomycin A₁ is a fungal metabolite originally isolated from C. rubra and has diverse biological activities. It is active against S. aureus, M. luteus, B. anthracis, C. bovis, and M. smegmatis (MICs = 1.56-12.5 μg/ml). Napyradiomycin A₁ is an estrogen receptor antagonist (IC₅₀ = 4.2 μM in rat uterine homogenates). It also inhibits mitochondrial NADH:ubiquinone oxidoreductase (complex I) and succinate:ubiquinone oxidoreductase (complex II) activities in bovine heart homogenates (IC₅₀s = 20 and 9.7 μM, respectively).

Napyradiomycin derivatives have antibacterial and tumor properties. Napyradiomycin A1 is a secondary metabolite isolated from Streptomyces. It is also an antibacterial antibiotic and an inhibitor of mitochondrial complexes I and II.

ChEBI: Napyradiomycin A1 is a member of menaquinones.

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[2] Y HORI. Napyradiomycins A and B1: non-steroidal estrogen-receptor antagonists produced by a Streptomyces.[J]. Journal of Antibiotics, 1993, 46 12: 1890-1893. DOI: 10.7164/antibiotics.46.1890
[3] KOHTA YAMAMOTO. Napyradiomycin A1, an inhibitor of mitochondrial complexes I and II[J]. Journal of Antibiotics, 2012, 65 4: 211-214. DOI: 10.1038/ja.2011.138