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. 1989 Feb;171(2):1143–1150. doi: 10.1128/jb.171.2.1143-1150.1989

Isolation and characterization of mutants of Rhizobium leguminosarum bv. viciae 248 with altered lipopolysaccharides: possible role of surface charge or hydrophobicity in bacterial release from the infection thread.

R A de Maagd 1, A S Rao 1, I H Mulders 1, L Goosen-de Roo 1, M C van Loosdrecht 1, C A Wijffelman 1, B J Lugtenberg 1
PMCID: PMC209712  PMID: 2536673

Abstract

Effects of alterations in lipopolysaccharide (LPS) structure of Rhizobium leguminosarum bv. viciae on effective symbiosis and on a number of cell surface characteristics were studied. Tn5 mutants with altered LPSs were screened for their inability to bind monoclonal antibody 3, one of three monoclonal antibodies to the tentative O-antigenic part of the wild-type LPS of strain 248. Ten class I LPS mutants completely lacked the O-antigen-containing LPS species. The class II LPS mutant had a severely diminished amount of an antigenically altered O-antigen-containing LPS. The class III LPS mutant had normal amounts of an altered, O-antigen-containing LPS. Class I and II mutants, but not the class III mutant, showed abnormal nodule development (i.e., blocked in the stage of bacterial release from the infection thread) resulting in nodules in which very few, at the most, plant cells contained bacteroids and which were unable to fix nitrogen. Class I and II mutants were nonmotile and were more sensitive to hydrophobic compounds than the parent strain. The most striking difference between the symbiotically defective class I and II LPS mutants on one hand and the wild-type strain and the class III mutant on the other hand was that the class I and II mutants have a more hydrophobic cell surface and a higher electrophoretic mobility. A role for an O-antigen-containing LPS in bacterial release from the infection thread, through its effects on general physicochemical cell surface characteristics, is proposed.

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