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. 1990 Apr;172(4):1804–1813. doi: 10.1128/jb.172.4.1804-1813.1990

Immunochemical analysis of lipopolysaccharides from free-living and endosymbiotic forms of Rhizobium leguminosarum.

S S Sindhu 1, N J Brewin 1, E L Kannenberg 1
PMCID: PMC208672  PMID: 2318803

Abstract

Rhizobium leguminosarum B556 and 8002 differ only with respect to carrying symbiotic plasmids with specificity for Pisum or Phaseolus hosts, respectively. Protease-treated samples derived from free-living cultures of both strains revealed a ladder of lipopolysaccharide (LPS-1) bands after periodate-silver staining of sodium dodecyl sulfate-polyacrylamide gels. These bands were arranged as doublets. After Western (immuno-) blotting, all LPS-1 bands reacted with monoclonal antibody JIM 21, whereas monoclonal antibody MAC 57 reacted only with the upper (slower-migrating) band and monoclonal antibody MAC 114 reacted only with the lower band of each doublet pair. Preparations obtained from bacteroids of Pisum or Phaseolus nodules showed significant differences in the size distribution and antigenicity of LPS. In bacteroids from Phaseolus sp., JIM 21 and MAC 57 each stained a ladder of LPS-1 bands on sodium dodecyl sulfate-polyacrylamide gels which corresponded in mobility to the upper band of each doublet pair seen in free-living cultures. MAC 114 did not react with the LPS from Phaseolus sp.-derived bacteroids. In bacteroids from Pisum sp., only fast-migrating (lower-molecular-weight) forms of LPS-1 could be visualized on gels, but both upper and lower bands of each doublet were still present and could be stained by the appropriate monoclonal antibody, MAC 57 or MAC 114, respectively. Similarly, bacteroids from R. leguminosarum 3841, which nodulates Pisum species, differed with respect to the structure and antigenicity of their LPS-1 from bacteroids of a related strain, B625, which nodulates Phaseolus species. Physiological factors were investigated that could account for these differences between the structures of LPS-1 from free-living cultures of B556 and 8002 and that from bacteroids. The following modifications in growth conditions each tended to reduce the expression of MAC 114 antigen and enhance the expression of MAC 57 antigen: succinate rather than glucose as the carbon source; microaerobic (2.5%, vol/vol) oxygen concentrations; and acidic (pH 5 to 6) culture medium. When all three of these conditions were combined, the LPS-1 that resulted was very similar to that in bacteroids from Pisum nodules. However, it was not possible to reproduce the LPS-1 pattern observed for bacteroids from Phaseolus nodules, which maintained a ladder of LPS bands reacting with MAC 57 antibody.

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Selected References

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