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. 1989 Sep;171(9):4543–4548. doi: 10.1128/jb.171.9.4543-4548.1989

Expression of a cell surface antigen from Rhizobium leguminosarum 3841 is regulated by oxygen and pH.

E L Kannenberg 1, N J Brewin 1
PMCID: PMC210248  PMID: 2768181

Abstract

Rhizobium leguminosarum bv. viciae 3841 was grown in liquid suspension culture to investigate how culture conditions could affect the expression of a developmentally regulated cell surface antigen associated with lipopolysaccharide. The antigen, which is recognized by monoclonal antibody AFRC MAC 203, was expressed when cultures were grown at neutral pH under low-oxygen conditions (less than 7.5% [vol/vol] O2 in the gas phase). Antigen was also expressed in aerobically grown cultures at pH values below 5.3. The nature of the nitrogen and the carbon sources had no effect on antigen expression except by indirect changes on the pH of the culture medium; similarly, growth in 0.3 M NaCl did not result in antigen expression. The induction of MAC 203 antigen by low-oxygen or low-pH culture conditions is discussed in the context of tissue-specific expression within the legume root nodule.

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Selected References

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