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EC Number
Metals/Ions
Commentary
Reference
CaCl2
activates in absence of Cl-, maximal activity at 0.3 mM
Cl-
the activity of the C-domain of sACE depends highly on chloride ion concentration and is inactive in its absence, whereas the N-domain can be completely activated at relatively low concentrations of this anion and is still active in the absence of chloride
Co2+
activation
Co2+
CoCl2 stimulates
CoCl2
0.1-1.0 mM, 2fold activation
KBr
activation is lower than with NaCl
KI
activation is lower than with NaCl
more
enzyme is not affected by addition of 0.1-1.0 mM CaCl2, Mn2Cl2, MgCl2 or 0.1 mM ZnCl2
Na+
at pH 7 increasing concentrations of NaCl result in a faster rate of conversion which reaches a plateau at 150-200 mM NaCl. The activation by NaCl at pH 7 is the result of a 330% increase in kcat/Km which is solely attributable to a lowering of the Km. At pH 8, maximal activity is achieved in absence of NaCl, weak inhibitory effect on hydrolysis of angiotensin I as salt concentrations increase from 0 to 200 mM
Na+
maximum activity at 75 mM NaCl
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