title: A novel hemagglutinin with antiproliferative activity against tumor cells from the hallucinogenic mushroom Boletus speciosus.
abstract: Little was known about bioactive compounds from the hallucinogenic mushroom Boletus speciosus. In the present study, a hemagglutinin (BSH, B. speciosus hemagglutinin) was isolated from its fruiting bodies and enzymatic properties were also tested. The chromatographic procedure utilized comprised anion exchange chromatography on Q-Sepharose, cation exchange chromatography on CM-Cellulose, cation exchange chromatography on SP-Sepharose, and gel filtration by FPLC on Superdex 75. The hemagglutinin was a homodimer which was estimated to be approximately 31 kDa in size. The activity of BSH was stable up to 60°C, while there was a precipitous drop in activity when the temperature was elevated to 70°C. BSH retained 25% hemagglutinating activity when exposed to 100 mM NaOH and 25 mM HCl. The activity was potently inhibited by 1.25 mM Hg(2+) and slightly inhibited by Fe(2+), Ca(2+), and Pb(2+). None of the sugars tested showed inhibition towards BSH. Its hemagglutinating activity towards human erythrocytes type A, type B, and type AB was higher than type O. The hemagglutinin showed antiproliferative activity towards hepatoma Hep G2 cells and mouse lymphocytic leukemia cells (L1210) in vitro, with IC50 of 4.7 μ M and 7.0 μ M, respectively. It also exhibited HIV-1 reverse transcriptase inhibitory activity with an IC50 of 7.1 μ M.
authors: Key Laboratory of Urban Agriculture (North) of Ministry of Agriculture, College of Biological Sciences and Engineering, Beijing University of Agriculture, Beijing 102206, China ; State Key Laboratory for Agrobiotechnology and Department of Microbiology, China Agricultural University, Beijing 100193, China.
authors: Jian
authors: 0000-0002-9520-3200
authors: J
authors: Sun
authors: School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong.
authors: Tzi-Bun
authors: TB
authors: Ng
authors: State Key Laboratory for Agrobiotechnology and Department of Microbiology, China Agricultural University, Beijing 100193, China.
authors: Hexiang
authors: H
authors: Wang
authors: Key Laboratory of Urban Agriculture (North) of Ministry of Agriculture, College of Biological Sciences and Engineering, Beijing University of Agriculture, Beijing 102206, China.
authors: Guoqing
authors: G
authors: Zhang
mesh_terms: D000363:Agaricales / Q000737:chemistry*; D000818:Animals; D000838:Anions; D000970:Antineoplastic Agents / Q000737:chemistry*; D000998:Antiviral Agents / Q000737:chemistry; D002241:Carbohydrates / Q000737:chemistry; D002412:Cations; D045744:Cell Line, Tumor; D002852:Chromatography, Ion Exchange; D002853:Chromatography, Liquid; D004354:Drug Screening Assays, Antitumor; D004912:Erythrocytes / Q000187:drug effects; D054303:HIV Reverse Transcriptase / Q000378:metabolism; D006388:Hemagglutinins / Q000737:chemistry*; D056945:Hep G2 Cells / Q000187:drug effects; D006801:Humans; D020128:Inhibitory Concentration 50; D051379:Mice; D013696:Temperature
chemical_list: D000838:Anions; D000970:Antineoplastic Agents; D000998:Antiviral Agents; D002241:Carbohydrates; D002412:Cations; D006388:Hemagglutinins; C514824:reverse transcriptase, Human immunodeficiency virus 1; D054303:HIV Reverse Transcriptase