Reference: Kang TH, et al. (2008) Chitin Synthase 2 Inhibitory Activity of O-Methyl Pisiferic Acid and 8,20-Dihydroxy-9(11),13-abietadien-12-one, Isolated from Chamaecyparis pisifera. Biol Pharm Bull 31(4):755-9

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Abstract


In the course of search for potent chitin synthase inhibitors from plant extracts, the chitin synthase 2 inhibitors, O-methyl pisiferic acid and 8,20-dihydroxy-9(11),13-abietadien-12-one which have diterpene skeleton, were isolated from the leaves of Chamaecyparis pisifera. These compounds inhibited chitin synthase 2 of Saccharomyces cerevisiae with the IC(50) values of 5.8 and 226.4 muM, respectively. Especially, O-methyl pisiferic acid showed 15.3-fold stronger inhibitory activity than polyoxin D (IC(50)=88.6 muM), a well-known chitin synthase inhibitor. These compounds exhibited weaker inhibitory activities against chitin synthase 1 than chitin synthase 2, whereas it showed no inhibitory activity for chitin synthase 3. The compound exhibited mixed competitive inhibition with respect to UDP-N-acetyl-D-glucosamine as substrate (K(i)=5 muM). These results indicated that O-methyl pisiferic acid is a specific inhibitor of chitin synthase 2. The compound also inhibited chitin synthase 1 of Candida albicans, which represents analogues to chitin synthase 2 of S. cerevisiae, with an IC(50) of 75.6 muM, which represents 1.8-fold weaker activity than that of polyoxin D. Although O-methyl pisiferic acid has been reported for antibacterial and insecticidal activities, the present study is the first report on its inhibitory activity against chitin synthase 2.

Reference Type
Journal Article
Authors
Kang TH, Hwang EI, Yun BS, Shin CS, Kim SU
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