title: A novel mannose-binding tuber lectin from Typhonium divaricatum (L.) Decne (family Araceae) with antiviral activity against HSV-II and anti-proliferative effect on human cancer cell lines.
abstract: A novel mannose-binding tuber lectin with in vitro antiproliferative activity towards human cancer cell lines and antiviral activity against HSV-II was isolated from fresh tubers of a traditional Chinese medicinal herb, Typhonium divaricatum (L.) Decne by a combined procedure involving extraction, ammonium sulfate precipitation, ion exchange chromatography on DEAE-SEPHAROSE, CM-SEPHAROSE and gel-filtration on sephacryl S-200. The apparent molecular mass of the purified Typhonium divaricatum lectin (TDL) was 48 kDa. TDL exhibits hemagglutinating activity toward rabbit erythrocytes at 0.95 microg/ml, and its activity could be strongly inhibited by mannan, ovomucoid, asialofetuin and thyroglobulin. TDL showed antiproliferative activity towards some well established human cancer cell lines, e.g. Pro-01 (56.7 +/- 6.8), Bre-04 (41.5 +/- 4.8), and Lu-04 (11.4 +/- 0.3). The anti-HSV-II activity of TDL was elucidated by testing its HSV-II infection inhibitory activity in Vero cells with TC(50) and EC(50) of 5.176 mg/ml and 3.054 microg/ml respectively. The full-length cDNA sequence of TDL was 1145 bp and contained an 813-bp open reading frame (ORF) encoding a 271 amino acid precursor of 29-kDa. Homology analysis showed that TDL had high homology with many other mannose-binding lectins. Secondary and three-dimensional structures analyses showed that TDL is heterotetramer and similar with lectins from mannose-binding lectin superfamily, especially those from family Araceae.
authors.affiliation: College of Life Sciences, Sichuan University, Chengdu 610064, China.
authors.forename: Yongting
authors.initials: Y
authors.lastname: Luo
authors.forename: Xiaochao
authors.initials: X
authors.lastname: Xu
authors.forename: Jiwei
authors.initials: J
authors.lastname: Liu
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: Yisheng
authors.initials: Y
authors.lastname: Sun
authors.forename: Zhen
authors.initials: Z
authors.lastname: Liu
authors.forename: Jinzhi
authors.initials: J
authors.lastname: Liu
authors.forename: Els
authors.initials: E
authors.lastname: Van Damme
authors.forename: Jan
authors.initials: J
authors.lastname: Balzarini
authors.forename: Jinku
authors.initials: J
authors.lastname: Bao
mesh_terms: D000595:Amino Acid Sequence; D000998:Antiviral Agents / Q000494:pharmacology*; D029064:Araceae / Q000235:genetics / Q000378:metabolism*; D001483:Base Sequence; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002850:Chromatography, Gel; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D006131:Growth Inhibitors / Q000494:pharmacology*; D006384:Hemagglutination / Q000187:drug effects; D018258:Herpesvirus 2, Human / Q000187:drug effects; D006801:Humans; D006863:Hydrogen-Ion Concentration; D037601:Mannose-Binding Lectin / Q000737:chemistry / Q000235:genetics* / Q000494:pharmacology; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010940:Plant Proteins / Q000737:chemistry / Q000235:genetics* / Q000494:pharmacology; D017433:Protein Structure, Secondary; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013696:Temperature
chemical_list: D000998:Antiviral Agents; D018076:DNA, Complementary; D006131:Growth Inhibitors; D037601:Mannose-Binding Lectin; D010940:Plant Proteins