- NAD+ binding to the Escherichia coli K(+)-uptake protein TrkA and sequence similarity between TrkA and domains of a family of dehydrogenases suggest a role for NAD+ in bacterial transport. Schlösser, A., Hamann, A., Bossemeyer, D., Schneider, E., Bakker, E.P. Mol. Microbiol. (1993)