Demethylmenaquinol is a substrate of Escherichia coli nitrate reductase A (NarGHI) and forms a stable semiquinone intermediate at the NarGHI quinol oxidation site.
Rendon J, Pilet E, Fahs Z, Seduk F, Sylvi L, Chehade MH, Pierrel F, Guigliarelli B, Magalon A, Grimaldi S.
Biochim Biophys Acta. 2015 Aug;1847(8):739-47. doi: 10.1016/j.bbabio.2015.05.001. Epub 2015 May 12. PMID: 25976528