We report the solution NMR structure of RHE_CH02687 from Rhizobium etli. Its structure consists of two β-sheets that together with two short and one long α-helix form a hydrophobic cavity. This protein shows a high structural similarity to the prokaryotic protein YndB from Bacillus subtilis, and the eukaryotic protein Aha1. NMR titration experiments confirmed that RHE_CH02687, like its homolog YndB, interacted with flavonoids, giving support for a biological function as a flavonoid sensor in the symbiotic int…
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