Abstract
The enhancing effect of low concentrations (eg, 8 microM) of bis(4-fluoro-3-nitrophenyl)sulfone (FNS) on 30S dynein ATPase activity is increased when 1 mM dithiothreitol (DTT) is present. The effect of FNS + DTT is optimal at pH 7.5. Activation of the latent ATPase activity of 30S dynein by FNS + DTT is partially prevented by 1--3 microM ATP. Adenylylimidodiphosphate (AMP-PNP) is less effective than ATP, while beta, gamma-methylene-adenosine triphosphase (AMP-PCP), though a much stronger inhibitor of ATPase activity than AMP-PNP, does not protect against enhancement. These results demonstrate the presence of high-affinity ATP-binding site on 30S dynein.
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