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Role of lectins in plant-microorganism interactions: I. Binding of soybean lectin to rhizobia.

Highly purified soybean lectin (SBL) was labeled with fluorescein isothiocyanate (FITC-SBL) or tritium ((3)H-SBL) and repurified by affinity chromatography. FITC-SBL was found to bind to living cells of 15 of the 22 Rhizobium japonicum strains tested. The lectin did not bind to cells of the other seven R. japonicum strains, or to cells of any of the nine Rhizobium strains tested which do not nodulate soybean. The binding of the lectin to the SBL-positive strains of R. japonicum was shown to be specific and reversible by hapten inhibition with d-galactose or N-acetyl-d-galactosamine.The lectin-binding properties of the SBL-positive R. japonicum strains were found to change substantially with culture age. The percentage of cells in a population exhibiting fluorescence after exposure to FITC-SBL varied between 0 and 70%. The average number of SBL molecules bound per cell varied between 0 and 2 x 10(6). While most strains had their highest percentage of SBL-positive cells and maximum number of SBL-binding sites per cell in the early and midlog phases of growth, one strain had a distinctly different pattern. The SBL-negative strains did not bind lectin at any stage of growth.Quantitative binding studies with (3)H-SBL indicated that the affinity constant for binding of SBL to its receptor sites on R. japonicum is approximately 4 x 10(7)m(-1). Many of the binding curves were biphasic. An inhibitor of SBL binding was found to be present in R. japonicum culture filtrates.