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The seeds of Spartium junceum contained a large quantity of lectin-like protein that did not appear to be either a hemagglutinin or active lectin. The cross-reactive material (CRM), like most legume seed lectins, was a tetrameric glycoprotein of about 130,000 M(r). The singlesized subunits of about 33,000 M(r) were not covalently associated. The amino acid composition was typical of legume lectins and was rich in hydroxy-amino acids and poor in sulfur-containing amino acids. The Spartium CRM contained about 3.5% covalently associated carbohydrate, most likely of the high-mannose type, since the CRM was precipitated by concanavalin A. The CRM was localized by electron-microscopic immunocytochemistry and found to be exclusively in protein-filled vacuoles (protein bodies). Because this protein was so similar immunologically, structurally, and in its physiology, to classic legume seed lectins, it is most likely a lectin homolog. Similar seed lectin CRMs appear to be both common and widespread in the Leguminosae.

The Purification, Properties, and Localization of an Abundant Legume Seed Lectin Cross-Reactive Material from Spartium junceum