Enocyanin, an anthocyanin extracted from grapes, exhibits inhibitory effects on leucine aminopeptidase, acidphosphatase, γ-glutamyl transpeptidase, and esterase activity.
3-Epicorosolic acid has a potent inhibitory effect on Epstein-Barr virus early antigen (EBV-EA) induction, it has potential anti-inflammatory activities as well as cancer chemopreventive activity.3-Epicorosolic acid shows both potent α-glucosidase and pro
Acanthifolicin, an okadaic acid derivative, has been shown top inhibit protein phosphatase 1 with an IC50= 20 nM (similar to that of okadaic acid at 19 nM).
The cyanobacterium Nodularia spumigena often contaminates the drinking water of rural communities in developing countries and accumulates in mussels, flounder, and cod from the northern Baltic Sea. Nodularin is a hepatotoxic monocylic pentapeptide produced by the N. spumigena. It is a potent inhibitor of protein phosphatase types 1 (PP1) and 2A (PP2A), exhibiting IC50 values of 1.8 and 0.026 nM, respectively. PP2B is inhibited to a lesser extent with an IC50 of 1.8 μM. No apparent inhibitory effect is observed with PP2C, alkaline phosphatase, acidphosphatase, insulin receptor tyrosine kinase, protein kinase A, phosphorylase kinase, or protein kinase C.
Thielavin A is a fungal metabolite originally isolated from T. terricola that is related to thielavin B . Thielavin A inhibits COX, blocking both the conversion of arachidonic acid to prostaglandin H2 and the conversion of PGH2 to PGE2 . Thielavin A also inhibits glucose-6-phosphatase in rat liver microsomes (IC50 = 4.6 μM). It is a non-competitive inhibitor of α-glucosidase from S. cerevisiae (IC50 = 23.8 μM; Ki = 27.8 μM).
Aquastatin A is a fungal metabolite originally isolated fromF. aquaeductuumthat has diverse biological activities.1It is active againstS. aureus(MIC = 32 μg/ml) and inhibits enoyl-acyl carrier protein reductase (Fabl; IC50= 3.2 μM) andS. aureusfatty acid synthesis (IC50= 3.5 μM).2Aquastatin A also inhibits the Na+/K+-ATPase and H+/K+-ATPase (IC50s = 7.1 and 6.2 μM, respectively), as well as protein tyrosine phosphatase 1B (PTP1B; IC50= 0.19 μM).1,3 1.Hamano, K., Kinoshita-Okami, M., Minagawa, K., et al.Aquastatin A, an inhibitor of mammalian adenosine triphosphatases from Fusarium aquaeductuum. Taxonomy, fermentation, isolation, structure determination and biological propertiesJ. Antibiot. (Tokyo)46(11)1648-1657(1993) 2.Kwon, Y.-J., Fang, Y., Xu, G.-H., et al.Aquastatin A, a new inhibitor of enoyl-acyl carrier protein reductase from Sporothrix sp. FN611Biol. Pharm. Bull.32(12)2061-2064(2009) 3.Seo, C., Soh, J.H., Oh, H., et al.Isolation of the protein tyrosine phosphatase 1B inhibitory metabolite from the marine-derived fungus Cosmospora sp. SF-5060Bioorg. Med. Chem. Lett.19(21)6095-6097(2009)
CBK289001 is a tartrate-resistant acidphosphatase (TRAP ACP5) inhibitor. CBK289001 inhibits TRAP 5b MV , TRAP 5b OX and TRAP 5a OX with IC 50 s of 125 μM, 4.21 μM and 14.2 μM, respectively.