title: Purification and biological activity of acidic polysaccharide from leaves of Thymus vulgaris L.
abstract: Polysaccharides are involved in biological responses and can activate complement system, which plays an important role in primary host defense mechanisms. We investigated anticomplementary activities from spice plants and selected thyme (Thymus vulgaris L.) as a potent complementary activator. Acidic polysaccharide (TV-3-IIIA-IIa) purified from the hot-water extract of thyme leaves by DEAE-Toyopearl 650C, Butyl-Toyopearl 650M and Sepharose CL-6B column chromatography and preparative HPLC. The purified polysaccharide, TV-3-IIIA-IIa showed potent anticomplementary activity via classical and alternative pathway with the increase proportional to dosage. TV-3-IIIA-IIa seemed to be a homogenous polymer from the results of HPLC and its molecular mass was estimated as 180 kDa. TV-3-IIIA-IIa mainly consisted of galacturonic acid (44.8 mol%), glucuronic acid (16.7 mol%), arabinose (11.1 mol%), rhamnose (9.2 mol%), galactose (8.9 mol%) and small amounts of glucose, xylose, mannose and fucose. By methylation analysis and reactivity to beta-glucosyl Yariv reagent, TV-3-IIIA-IIa was assumed to contain small amounts of type II arabinogalactan and large amounts of pectin-like polysaccharides in the structure. Based upon these results, TV-3-IIIA-IIa was suggested to be a complement activator.
authors.affiliation: Graduate School of Biotechnology, Korea University, Seoul.
authors.forename: H
authors.initials: H
authors.lastname: Chun
authors.forename: D H
authors.initials: DH
authors.lastname: Shin
authors.forename: B S
authors.initials: BS
authors.lastname: Hong
authors.forename: H Y
authors.initials: HY
authors.lastname: Cho
authors.forename: H C
authors.initials: HC
authors.lastname: Yang
mesh_terms: D000818:Animals; D002848:Chromatography, DEAE-Cellulose; D002851:Chromatography, High Pressure Liquid; D003169:Complement Inactivator Proteins / Q000494:pharmacology*; D004912:Erythrocytes / Q000187:drug effects; D066298:In Vitro Techniques; D008745:Methylation; D008970:Molecular Weight; D010936:Plant Extracts / Q000494:pharmacology; D018515:Plant Leaves / Q000737:chemistry; D011134:Polysaccharides / Q000302:isolation & purification* / Q000494:pharmacology*; D012756:Sheep; D046930:Thymus Plant / Q000737:chemistry*
chemical_list: D003169:Complement Inactivator Proteins; D010936:Plant Extracts; D011134:Polysaccharides; C444500:TV-3-IIIA-IIa