GNF179 Metabolite, the derivative of GNF179—an optimized 8,8-dimethyl IP analog—demonstrates significant potency (4.8 nM against the multidrug-resistant W2 strain) alongside in vitro metabolic stability and in vivo oral bioavailability.
6-Prenylindole is a bacterial metabolite that has been found in Streptomyces and has antifungal and antimalarial properties.1 It is active against A. brassicicola strain TP-F0423 and F. oxysporum f. sp. tulipae TU-4-2 (15 and 30 μg disc in the paper disc assay), and also drug-resistant P. falciparum strain K1 (IC50 = 21 μg ml).2 |1. Sasaki, T., Igarashi, Y., Ogawa, M., et al. Identification of 6-prenylindole as an antifungal metabolite of Streptomyces sp. TP-A0595 and synthesis and bioactivity of 6-substituted indoles. J. Antibiot. (Tokyo) 55(11), 1009-1012 (2002).|2. Nkunya, M.H., Makangara, J.J., and Jonker, S.A. Prenylindoles from Tanzanian Monodora and Isolona species. Nat. Prod. Res. 18(3), 253-258 (2004).
Violacein is a bacterial metabolite originally isolated from C. violaceum that has antibacterial and antiprotozoal activities.[1] [2] It is produced by C. violaceum as a purple pigment in response to N-hexanoyl homoserine lactone , a property that has been modified to create a strain of C. violaceum used in detecting quorum-sensing molecules.[3] Violacein is active against Gram-positive bacteria, including B. subtilis and S. aureus (MICs = 0.8 and 1.6 µM, respectively). It is also active against P. falciparum, including chloroquine-susceptible and -resistantstrains (IC50s = 0.85 and 0.63 µM, respectively).[2] It reduces parasitemia in a mouse model of nonlethal P. chabaudi chabaudi infection when administered at a dose of 7.5 mg/kg and increases survival in a mouse model of lethal P. chabaudi chabaudi infection. Violacein permeabilizes the cytoplasmic membrane of bacterial cells but does not affect the cell wall.[1]
Milbemycin A4 oxime is a derivative of milbemycin A4 and a component of milbemycin oxime , compounds that both have insecticidal and nematocidal activity. Milbemycin A4 oxime (0.05 mg kg) reduces the number of microfilariae of the heartworm D. immitis in naturally infested dogs. It inhibits the growth of clinical isolates of C. glabrata with MIC80 values ranging from 16 to greater than 32 μg ml. Milbemycin A4 oxime (2.5 μg ml) blocks efflux of fluconazole from a clinical isolate of C. glabrata, but not from a strain lacking the efflux pumps CgCDR1 and PDH1, and reduces the MICs of fluconazole and 4-nitroquinoline 1-oxide in wild-type C. glabrata. It enhances adriamycin-induced inhibition of cell growth, as well as increases the intracellular accumulation of adriamycin and the P-glycoprotein substrate rhodamine 123 , in adriamycin-resistant, but not -sensitive, MCF-7 breast cancer cells in a concentration-dependent manner.
Neospiramycin I is a macrolide antibiotic and derivative of spiramycin I.1It is active against the macrolide-sensitive KB210, but not the macrolide-resistant KB224, strain ofS. aureus(MICs = 3.12 and >100 μg/ml, respectively), as well asB. cereus,B. subtilis,M. luteus,E. coli, andK. pneumoniae(MICs = 1.56, 3.12, 3.12, 0.2, 50, and 12.5 μg/ml, respectively). Neospiramycin I binds toE. coliribosomes with an IC50value of 1.2 μM. It protects against mortality in a mouse model ofS. pneumoniaetype III infection (ED50= 399.8 mg/kg).2