Enzyme unit

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Enzyme unit (enzyme unit, U) - unit of enzyme activity introduced in 1964 by the International Union of Biochemistry and Molecular Biology Nomenclature Committee. Defined by the Enzyme Commission in 1961. One U is the amount of enzyme catalyzing the conversion of 1 μmol of substrate in 1 minute. Common conditions are: temperature 30 ° C, pH data and maximum substrate saturation.

Since the minute is not an SI, it is recommended to use katala for the determination of enzyme activity (since 1978).

1 U = 1/60 μkatala = 16.67 nanocastal.

The U-enzyme unit has nothing to do with the IU (International Unit), a measure of the activity of biologically active substances.

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