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The trimethylamine dehydrogenase by 2022 HZAU-iGEM team

We performed SDS-PAGE to identify that trimethylamine dehydrogenase can be expressed. Because trimethylamine dehydrogenase (TMADHexist as dimers, the protein molecular weight would double. So, protein molecular weight of TMADH is 164.9kDa.

We cultivated E. coli BL21 containing tmd, V344C tmd and E. coli BL21 without tmd (Blank) for about 3 hours (OD600 0.6~0.8). Then they were induced by 4mM theophylline for 9 hours. After adjusting the density of three tubes of bacteria and making them almost have no difference, we added some TMA into bacteria cultures to make the concentration of substrate TMA 5×10-5mol/L and continued to cultivate them. Take samples before we add TMA, and add TMA for 0 min, 10 min, 20min, 3h, 6h, 9h. This is how we handle bacteria samples. 700 µl bacteria samples were centrifugated at 3000 × g 5 min at 4 °C, take 500µl supernatant. Then 300 µl freshly prepared 10 mM solution of FMOC-Cl in acetonitrile was added, after 1 min, 100 µl 100 mM glycine solution was added to neutralize the reaction.

This is our method of HPLC Supernatant was transferred to new tube for analysis on HPLC system. 10 µl was loaded on to C18 column equilibrated with acetonitrile-buffer (50%) at flow rate 0.75 ml/min. The column was then flushed with a gradient to 100% elutant buffer B (acetonitrile 75% v/v) within 5 min. Ultraviolet absorption of column elutant was monitored (220 nm) and DMA quantification was calculated based on ratio to standard sample peak area.

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