Abstract
Soybean (Glycine max L. Merr.) mutants lacking the ability to produce the lectin normally found in soybean seeds (SBL) are designated Le-. A protein of higher molecular weight that cross-reacts with antibodies raised to SBL was found at nearly equivalent levels in roots, hypocotyls, and leaves, and at lower levels in cotyledons and dry seeds of both Le+ and Le- soybean cultivars. Earlier work suggested that this protein was a novel lectin. Clones isolated from a Le- soybean root cDNA library produced a cross-reacting protein of the same size in Escherichia coli. Sequence analysis of these clones revealed a high degree of similarity to the ribosomal protein P0. The cross-reacting protein co-purified with ribosomes, and a monoclonal antibody raised to purified brine shrimp P0 cross-reacted to the same protein. The protein showed no lectin activity in a hemagglutination assay, nor did it bind to an N-acetyl-D-galactosamine affinity column. On the basis of this evidence, we conclude that the SBL-cross-reacting protein is not a lectin but a homologue of the ribosomal protein P0. Consequently, Le- soybeans must produce a lectin that is dissimilar to SBL at both the DNA and amino acid levels and we suggest that it is this lectin which is involved in nodulation.
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Wycoff, K.L., van Rhijn, P. & Hirsch, A.M. The ribosomal protein P0 of soybean (Glycine max L. Merr.) has antigenic cross-reactivity to soybean seed lectin. Plant Mol Biol 34, 295–306 (1997). https://doi.org/10.1023/A:1005817114562
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DOI: https://doi.org/10.1023/A:1005817114562