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The TMAO reductase activity of Escherichia coli grown anaerobically in the presence or absence of TMAO was analysed on linear sucrose gradients and on non‐denaturing polyacrylamide gels. The results, together with those obtained by analysis of some other properties of TMAO reductase, showed that there are significant differences between the enzyme synthesized in the absence of TMAO (“constitutive” enzyme) and that synthesized in its presence (“inducible” enzyme). A similar study of a tor mutant specifically altered in the structural gene for TMAO reductase, showed that the enzymes synthesized under the 2 growth conditions are probably 2 distinct enzymes encoded by different genes.

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