Interaction of Azospirillum lipoferum with wheat germ agglutinin stimulates nitrogen fixation

Eva Karpati, Peter Kiss, Tamas Ponyi, Istvan Fendrik, Miklos De Zamaroczy, Laszlo Orosz

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Abstract

In vitro, the nitrogen fixation capability of A. lipoferum is efficiently increased in the presence of wheat germ agglutinin (WGA). A putative WGA-binding receptor, a 32-kDa protein, was detected in the cell capsule. The stimulatory effect required N-acetyl-D-glucosamine dimer (GlcNAc(di)) terminated sugar side chains of the receptor and was dependent on the number of GlcNAc(di) links involved in receptor-WGA interface. Binding to the primary sugar binding sites on WGA had a larger stimulatory effect than binding to the secondary sites. The WGA-receptor complex generated stimulus led to elevated transcription of the nifH and nifA genes and of the glnBA gene cluster but not of the glnA gene from its own promoter. There may well be a signalling cascade contributing to the regulation of nitrogen fixation.

Original languageEnglish
Pages (from-to)3949-3955
Number of pages7
JournalJournal of bacteriology
Volume181
Issue number13
Publication statusPublished - Jul 1 1999

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ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology

Cite this

Karpati, E., Kiss, P., Ponyi, T., Fendrik, I., De Zamaroczy, M., & Orosz, L. (1999). Interaction of Azospirillum lipoferum with wheat germ agglutinin stimulates nitrogen fixation. Journal of bacteriology, 181(13), 3949-3955.