Table II.

Frequency of processive runs by WT and mutant She2p

She2p Number of events Event frequency 
  mm−2 s−1 
WT* 59 56.4 
S120Y 17 10.7 
L130Y 5 1.3 
Δhelix 0 0 
She2p Number of events Event frequency 
  mm−2 s−1 
WT* 59 56.4 
S120Y 17 10.7 
L130Y 5 1.3 
Δhelix 0 0 

The values in the second column were obtained with chicken skeletal actin. Event frequency for WT* is 11.2 times higher on yeast actin–tropomyosin.

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