title: Purification and characterisation of gelonin from seeds of Gelonium multiflorum.
abstract: Gelonin, a ribosome-inactivating protein has been isolated from the seeds of Gelonium multifluorum of Euphorbiaceae family by two methods and the results are compared. In method-I conventional aqueous extraction, cation-exchange and gel-filtration chromatography has been used. In method-II S-Sepharose fast flow gel has been used to purify the proteins from the seed extract, followed by ammonium sulfate fractionation, cation-exchange and gel-filtration chromatography. Extensive physico-chemical and immunological characterizations show that molecular weight of gelonin as determined by gel-filtration chromatography and SDS-PAGE is approximately 30 kDa. The non-proteinous material which binds to CMC-gel in association with gelonin in method-I is substantially removed when gelonin is purified by method-II. Cation exchange, G-100 chromatography, RP-HPLC and SDS-PAGE show that method-II yields 50% more purified gelonin when compared to the yield by method-I. The immunoreactivity of gelonin obtained by methods I and II vary from 22-26% and 50-66% respectively and the ribosome-inactivating property vary from 46-56% and 70-87% respectively.
authors.affiliation: Hormone Biochemistry Laboratory, North-Eastern Hill University, Shillong, Meghalaya, India. vsingh@nehus.ren.nic.in
authors.forename: V
authors.initials: V
authors.lastname: Singh
authors.forename: R C
authors.initials: RC
authors.lastname: Singh
authors.forename: R K
authors.initials: RK
authors.lastname: Dubey
authors.forename: A
authors.initials: A
authors.lastname: Alam
mesh_terms: D002850:Chromatography, Gel; D002851:Chromatography, High Pressure Liquid; D003429:Cross Reactions; D004591:Electrophoresis, Polyacrylamide Gel; D008970:Molecular Weight; D010940:Plant Proteins / Q000737:chemistry / Q000276:immunology / Q000302:isolation & purification*; D010944:Plants / Q000737:chemistry* / Q000196:embryology; D054789:Ribosome Inactivating Proteins, Type 1; D012639:Seeds / Q000737:chemistry*
chemical_list: D010940:Plant Proteins; D054789:Ribosome Inactivating Proteins, Type 1; C025674:GEL protein, Gelonium multiflorum