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. 1987 Mar;169(3):1161–1167. doi: 10.1128/jb.169.3.1161-1167.1987

Alteration of surface properties in a Tn5 mutant strain of Rhizobium trifolii 0403.

A E Gardiol, R I Hollingsworth, F B Dazzo
PMCID: PMC211914  PMID: 3029022

Abstract

A symbiotically defective mutant strain of Rhizobium trifolii, UR251, was obtained by transposon Tn5 mutagenesis of R. trifolii 0403 rif and recognized by its partially ineffective (Fix +/-) phenotype on white clover plants. UR251 had a single Tn5 insertion in plasmid DNA, a wild-type plasmid pattern, and no detectable Mu DNA sequences originally present in the vector used for Tn5 mutagenesis. Agglutination by the clover lectin trifoliin A and attachment to clover root hairs was higher with UR251 than with the wild-type strain. The capsular polysaccharide (CPS) of UR251 was altered, as shown by a slower rate of CPS depolymerization with a CPS beta-lyase, PD-I; more pyruvate and less acetate and 3-hydroxybutanoate noncarbohydrate substitutions as quantitated by 1H nuclear magnetic resonance; and a higher pyruvyl transferase activity (enzymatic pyruvylation of lipid-bound saccharides). The site of increased pyruvylation in the CPS of UR251 was on the terminal galactose of the branch of the repeating oligosaccharide unit. These results show that the level of noncarbohydrate substitutions of the CPS as well as pyruvyl transferase activity are altered in R. trifolii UR251 and that trifoliin A-binding ability and clover root hair attachment are improved in this mutant strain of R. trifolii 0403 rif.

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Selected References

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