title: Biochemical and functional properties of a lectin purified from korean large black soybeans--a cultivar of glycine max.
abstract: Lectins, a class of proteins that reversibly and non-enzymatically bind specific sugars, have been purified from different kinds of legumes. In this study, a 48-kDa lectin (KBL) was purified from Korean large black soybeans using liquid chromatography. The specific hemagglutinating activity of the KBL was 4096 titer/mg. EDTA-induced loss of hemagglutinating activity of KBL could be recovered by addition of Fe(3+) ions and some divalent cations as Ca(2+), Mn(2+), Fe(2+), Cu(2+), Zn(2+), and Pb(2+). Sugars such as D-(+)-galactose, D-(+)-raffinose, L-(+)-arabinose, alpha-D-(+)-melibiose, and alpha-lactose could inhibit the hemagglutinating activity of the lectin. Furthermore, the protein showed high thermal stability as well as stability over a wide range of pH values. KBL inhibited HIV-1 reverse transcriptase activity with an IC(50) of 1.38 microM. However, it was destitute of cytokine releasing, mitogenic, ribonuclease and antifungal activities. In addition, inhibitory activity toward nasopharyngeal cell lines was undetectable in KBL at concentrations up to 20 microM.
authors.affiliation: School of Biomedical Sciences, Faculty of Medicine, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China. b021770@mailserv.cuhk.edu.hk
authors.forename: E F
authors.initials: EF
authors.lastname: Fang
authors.forename: J H
authors.initials: JH
authors.lastname: Wong
authors.forename: P
authors.initials: P
authors.lastname: Lin
authors.forename: T B
authors.initials: TB
authors.lastname: Ng
mesh_terms: D000818:Animals; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D002853:Chromatography, Liquid; D016207:Cytokines / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D005786:Gene Expression Regulation / Q000187:drug effects; D054303:HIV Reverse Transcriptase / Q000037:antagonists & inhibitors / Q000378:metabolism; D006384:Hemagglutination / Q000187:drug effects; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007723:Korea; D008214:Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D037121:Plant Lectins / Q000032:analysis* / Q000302:isolation & purification / Q000494:pharmacology; D055550:Protein Stability; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020539:Sequence Analysis, Protein; D030262:Soybean Proteins / Q000032:analysis* / Q000302:isolation & purification / Q000494:pharmacology; D013025:Glycine max / Q000737:chemistry*; D013696:Temperature; D010835:Phytohemagglutinins
chemical_list: D016207:Cytokines; D054303:HIV Reverse Transcriptase; D037121:Plant Lectins; D030262:Soybean Proteins; C028824:soybean lectin; D010835:Phytohemagglutinins