The effect of added metals on purified rat tyrosine hydroxylase which is predominantly iron-free has been determined. The presence of 10 μM ferrous ammonium sulfate results in a ten-fold increase in the activity of enzyme containing 0.1 iron atom per subunit. The enzyme activity is half-maximal at a free ferrous iron concentration of 0.15 μM. Copper, zinc, silver, and nickel are unable to replace ferrous iron. Ferric iron is inactive unless ascorbate is included to reduce it.
|Original language||English (US)|
|Number of pages||5|
|Journal||Biochemical and Biophysical Research Communications|
|State||Published - May 30 1989|
ASJC Scopus subject areas
- Molecular Biology
- Cell Biology