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Hypericin from Hypericum species

Binapthoquinones include the phototoxic phytotoxin cercosporin from the fungus Cercospora (two Phe Q moieties linked by two Phe—Phe links and an MD link). Hypericin (two anthraquinones linked by three Phe—Phe linkages) is a bianthraquinone from Hypericum species (Hypericaceae). Hypericin is a phototoxic protein kinase inhibitor that causes light-dependent ovine facial eczema. Benzonaphthoquinones include the der-matitic cypripedin (Phe Phe QJ. Lichen 7-chloroemodin is a novel chloroanthraquinone and the fused tricyclic pyrano-a-naphthoquinone (3-lapachone (Phe oQJ C50) is a reverse transcriptase inhibitor with antimicrobial and cytotoxic activity. [Pg.25]

Hypericin and related compounds are responsible for the red/dark colour of the glands found on the leaves and petals of Hypericum species. The pigment is not a common natural component until now, it has been isolated only from Hypericum plants and from some species of insects [2,30], where it acts as a photoreceptor. [Pg.607]

Hypericin 1 is present in plants, insects and protozoa. In plants, apart from H. perforatum, it occurs in a number of other species of Hypericum, namely H. hirsutum, H. maculatum, H. nummularium and H. triquetrifolium [17]. It is located in minute glands on different parts of the plants such as young stems, leaves and flowers. Interestingly, hypericin 1 is found in the integument of Australian Lac insects of the Coccoidea family, and appears with a number of structurally-related compounds [18, 19]. In protozoa, the blue-green ciliate, Stentor coerulus possesses a photoreceptor, stentorin, which consists of proteins bound to hypericin 1 [20]. [Pg.647]


See other pages where Hypericin from Hypericum species is mentioned: [Pg.263]    [Pg.646]    [Pg.666]    [Pg.674]    [Pg.675]    [Pg.306]    [Pg.91]    [Pg.48]    [Pg.265]    [Pg.67]    [Pg.493]    [Pg.499]    [Pg.345]    [Pg.92]    [Pg.365]   
See also in sourсe #XX -- [ Pg.607 ]




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