3.1.3.57 K+ activation, 0.05-0.1 M 646405 3.1.3.57 Mg2+ kinetics 646405 3.1.3.57 Mg2+ optimal concentration 2mM, 3',5'-bisphosphate nucleotide as substrate 702183 3.1.3.57 Mg2+ required 679090 3.1.3.57 Mg2+ requirement 646405, 646406, 646408 3.1.3.57 Mg2+ strictily dependent on 646412 3.1.3.57 Na+ 0.05-0.1 M 646405 3.1.3.57 Na+ activation 646405, 646410 3.1.3.57 Na+ activation below 4 mM, inhibition above 646410