title: Purification and characterization of two types of Cytisus sessilifolius anti-H(O) lectins by affinity chromatography.
abstract: Two anti-H(O) lectins were separated from extracts of Cytisus sessilifolius seeds by successive affinity chromatographies on columns of di-N-acetylchitobiose- and galactose-Sepharose 4B. One was found to be inhibited most by di-N-acetylchitotriose or tri-N-acetylchitotriose [Cytisus-type anti-H(O) lectin designated as Cytisus sessilifolius lectin I (CSA-I)] and the other anti-H(O) lectin was inhibited by galactose or lactose and designated as Cytisus sessilifolius lectin II (CSA-II). These two anti-H(O) lectins were further purified by gel filtration on TSK-Gel G3000SW. These preparations were homogeneous as judged by polyacrylamide gel electrophoresis and gel filtration. The molecular masses of the purified lectins I and II were found to be 95,000 and 68,000 Da, respectively, by gel filtration on TSK-Gel G3000SW. On polyacrylamide gel electrophoresis in the presence of sodium dodecyl sulfate and 2-mercaptoethanol, both lectins gave a single component of molecular masses of 27,000 +/- 2,000 and 34,000 +/- 2,000 Da, respectively, suggesting that the lectins I and II were composed of four and two apparently identical subunits, respectively. Lectins I and II contain 38% and 13% carbohydrate, respectively, and only very small amounts of cysteine and methionine, but they are rich in aspartic acid, serine and glycine. The N-terminal amino-acid sequences of these two lectins were determined and compared with those of several lectins already published.
authors.affiliation: Division of Chemical Toxicology and Immunochemistry, Faculty of Pharmaceutical Sciences, University of Tokyo.
authors.forename: Y
authors.initials: Y
authors.lastname: Konami
authors.forename: K
authors.initials: K
authors.lastname: Yamamoto
authors.forename: T
authors.initials: T
authors.lastname: Osawa
mesh_terms: D000595:Amino Acid Sequence; D002846:Chromatography, Affinity; D037102:Lectins / Q000737:chemistry* / Q000302:isolation & purification; D008969:Molecular Sequence Data; D008970:Molecular Weight; D037121:Plant Lectins; D010944:Plants / Q000032:analysis*; D012639:Seeds / Q000032:analysis
chemical_list: D037102:Lectins; D037121:Plant Lectins