Enzymes and cellular interplay required for flux of fixed nitrogen to ureides in bean nodules

Luisa Voß, Katharina J. Heinemann, Marco Herde, Nieves Medina-Escobar and Claus-Peter Witte ()
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Luisa Voß: Leibniz Universität Hannover
Katharina J. Heinemann: Leibniz Universität Hannover
Marco Herde: Leibniz Universität Hannover
Nieves Medina-Escobar: Leibniz Universität Hannover
Claus-Peter Witte: Leibniz Universität Hannover

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Tropical legumes transport fixed nitrogen in form of ureides (allantoin and allantoate) over long distances from the nodules to the shoot. Ureides are formed in nodules from purine mononucleotides by a partially unknown reaction network that involves bacteroid-infected and uninfected cells. Here, we demonstrate by metabolic analysis of CRISPR mutant nodules of Phaseolus vulgaris defective in either xanthosine monophosphate phosphatase (XMPP), guanosine deaminase (GSDA), the nucleoside hydrolases 1 and 2 (NSH1, NSH2) or xanthine dehydrogenase (XDH) that nodule ureide biosynthesis involves these enzymes and requires xanthosine and guanosine but not inosine monophosphate catabolism. Interestingly, promoter reporter analyses revealed that XMPP, GSDA and XDH are expressed in infected cells, whereas NSH1, NSH2 and the promoters of the downstream enzymes urate oxidase (UOX) and allantoinase (ALN) are active in uninfected cells. The data suggest a complex cellular organization of ureide biosynthesis with three transitions between infected and uninfected cells.

Date: 2022
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DOI: 10.1038/s41467-022-33005-5

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