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. 1986 Jul 15;237(2):483–489. doi: 10.1042/bj2370483

Purification and characterization of Robinia pseudoacacia seed lectins. A re-investigation.

J Wantyghem, C Goulut, J P Frénoy, E Turpin, Y Goussault
PMCID: PMC1147010  PMID: 3800899

Abstract

Two lectins, RPA 1 and RPA 3, were purified from Robinia pseudoacacia seeds. These two lectins differ in their physicochemical and biological properties. By analytical ultracentrifugation the Mr values of RPA 1 and RPA 3 were estimated to be 59,000 and 105,000 respectively. From SDS/polyacrylamide-gel-electrophoresis data it was estimated that RPA 1 consisted of two subunits of Mr 34,000, and RPA 3 of two types of subunits (Mr 30,500 and 29,000). RPA 1 and RPA 3 were found to be glycoproteins of comparable amino acid composition. RPA 1 was the more highly glycosylated molecule (11.6% versus 4.3%). The carbohydrate-specificity of RPA 1 appears to be complex. RPA 3 was inhibited by N-acetyl-D-galactosamine and human alpha-glycoproteins. Both lectins exerted a mitogenic effect on human peripheral-blood lymphocytes. Concentrations between 0.5 and 1 microgram of RPA 3/ml gave optimal proliferative responses, whereas for RPA 1 concentrations higher than 10 micrograms/ml were needed for these responses.

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