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. 1995 Nov;177(21):6237–6245. doi: 10.1128/jb.177.21.6237-6245.1995

In vitro sulfotransferase activity of NodH, a nodulation protein of Rhizobium meliloti required for host-specific nodulation.

D W Ehrhardt 1, E M Atkinson 1, K F Faull 1, D I Freedberg 1, D P Sutherlin 1, R Armstrong 1, S R Long 1
PMCID: PMC177465  PMID: 7592390

Abstract

Early stages of nodulation involve the exchange of signals between the bacterium and the host plant. Bacterial nodulation (nod) genes are required for Rhizobium spp. to synthesize lipooligosaccharide morphogens, termed Nod factors. The common nod genes encode enzymes that synthesize the factor core structure, which is modified by host-specific gene products. Here we show direct in vitro evidence that Rhizobium meliloti NodH, a host-specific nodulation gene, catalyzes the transfer of sulfate from 3'-phosphoadenosine 5'-phosphosulfate to the terminal 6-O position of Nod factors, and we show substrate requirements for the reaction. Our results indicate that polymerization of the chitooligosaccharide backbone likely precedes sulfation and that sulfation is not absolutely dependent on the presence or the particular structure of the N-acyl modification. NodH sulfation provides a tool for the enzymatic in vitro synthesis of novel Nod factors, or putative Nod factors intermediates, with high specific activity.

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Selected References

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