title: Generation of recombinant antibodies against orchardgrass Acidic nsLTP-like proteins.
abstract: Embryogenic and non-embryogenic suspension cultures of orchardgrass (Dactylis glomerata L.) secreted into the culture medium a set of proteins, among which low molecular mass (11/12 kDa) proteins were found. However, only the 11/12 kDa proteins from the embryogenic suspension cultures reacted specifically with an antiserum raised against the carrot EP2 non-specific lipid transfer protein (nsLTP). Two-dimensional (2-D) electrophoretic analysis revealed that the extracellular nsLTP-like proteins from the embryogenic lines were acidic proteins, with pI values ranging between 4.3 and 6.4, and the 11/12 kDa proteins of the non-embryogenic lines were basic ones (pI 8-9.3). This is only the second case to report on the accumulation of extracellular acidic nsLTP-like proteins in the culture medium during somatic embryogenesis. A naive phage display Griffin1. library was used to select single-chain phage antibodies, which specifically bind to acidic nsLTP-like proteins. Nine phage clones were selected after four rounds of biopanning of the target proteins blotted on a nitrocellulose membrane. Three soluble monoclonal single-chain phage antibodies, expressed in the non-suppressor E. coli strain HB2151, were purified by metal affinity chromatography and found to be highly specific for the acidic nsLTP-like proteins from the embryogenic suspension cultures. The application of the selected monoclonal antibodies for localization and elucidation of the role of the acidic nsLTP-like proteins in vivo is discussed.
authors.affiliation: Department of Biochemistry, Faculty of Biology, Sofia University, 8 Dragan Zankov str, 1164 Sofia, Bulgaria.
authors.forename: Gorica
authors.initials: G
authors.lastname: Rakleova
authors.forename: Ivanka
authors.initials: I
authors.lastname: Tsacheva
authors.forename: Mima
authors.initials: M
authors.lastname: Petkova
authors.forename: Ivelyn
authors.initials: I
authors.lastname: Pantchev
authors.forename: Magdalena
authors.initials: M
authors.lastname: Tchorbadjieva
mesh_terms: D000906:Antibodies; D000911:Antibodies, Monoclonal / Q000276:immunology; D000918:Antibody Specificity; D031745:Dactylis / Q000235:genetics / Q000276:immunology*; D018506:Gene Expression Regulation, Plant; D010940:Plant Proteins / Q000276:immunology* / Q000302:isolation & purification; D011994:Recombinant Proteins / Q000276:immunology; D012639:Seeds / Q000235:genetics / Q000276:immunology
chemical_list: D000906:Antibodies; D000911:Antibodies, Monoclonal; D010940:Plant Proteins; D011994:Recombinant Proteins