titrating the increase in dnase i activity of the actin -- dnase i complex against nucleotide concentration in the presence of edta , the association constant of atp to the cation-free form of actin -- dnase i complex was found to be 5 x 10 ( 3 ) m-1 , which is many orders of magnitude lower than in the presence of divalent metal ions .
C0007447
cation
C0022023
ions