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UNIQd6e6b348790b5756-partinfo-00000000-QINU UNIQd6e6b348790b5756-partinfo-00000001-QINU The TMM enzyme is not specific to TMA as a substrate. It is also known to oxidize indole to indoxyl, which dimerizes into the well known blue pigment indigo. Indole is a natural product of tryptophan metabolism in E. coli. We took advangage of this indole production activity to characterize the TMM enzyme. E. coli that were cultured in LB supplemented with tryptophan (2 g/L) produced a deep blue pigment with absorbance properties matching indigo (Fig. 1). Without TMM expression or without tryptophan, indigo production was minimal or absent.

Average absorbances of DMSO extractions from bacterial lysates shows TMM activity.