Abstract

A tertiary amine monoxygenase from a Pseudomonas sp. was partially purified (35-fold) and characterized. In the presence of nitrilotriacetate (NTA), O 2, NADH, and Mn 2+, the enzyme yielded two sets of products: iminodiacetate, glyoxylate, NAD + and H 2O; or H 2O 2 and NAD +. Which set of products predominated was a function of enzyme concentration, ionic strength of solution, pH, and cation supplied. NTA functioned both as a modifiable substrate and as a stimulator of NADH oxidase activity. A requirement for preincubation with Mn 2+ and NTA to eliminate enzyme hysteresis and the similar Km values for NTA and Mn 2+ suggested that the substrate and metal were bound as a unit by the enzyme.

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