title: Effect of metal ions on the aspartate transaminase (E.C.2.6.1.1.) activity in tobacco tissue culture.
abstract: Aspartate transaminase enzyme was prepared from tobacco tissue cultures. Effect of 13 different metal ions on the enzyme activity was preliminarily studied. The enzyme activity was inhibited by five ions, namely Cd2+, Hg2+, Zn2+, Cu2+, and Ag+. None of the ions investigated enhanced the activity. Fe2+ caused an apparent activity increase in the reaction mixture. Pyridoxal-phosphate enhanced this effect of the Fe2+.
mesh_terms: D001219:Aspartate Aminotransferases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D008670:Metals / Q000494:pharmacology*; D010944:Plants / Q000201:enzymology*
chemical_list: D008670:Metals; D001219:Aspartate Aminotransferases