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The steady-state ATPase activity of GroEL and GroEL-GroES scales with the number of C-terminal tails, whereas GroES completely suppresses the activity of tail-multiplied SR1. The rate of ATP hydrolysis for tail-multiplied versions of GroEL (A) and SR1 (B) was determined by the malachite green assay in the absence (filled bars) or presence (open bars) of GroES, using 1 mM ATP. Error bars represent the standard deviation in three experiments.
