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• W1971330505 abstract "Abstract The effects of N -ethylmaleimide and p -hydroxymercuribenzoate on the ATPase activity of glycerinated Tetrahymena cilia , of 30 S dynein extracted from the cilia, and on the residual ATPase remaining after extraction were studied and correlated with the effects of these reagents on the pellet height response of these cilia. Simultaneous addition of N -ethylmaleimide and ATP to cilia caused a slight inhibition of ATPase activity. Preincubation of the cilia with low N -ethylmaleimide in the absence of ATP, however, enhanced the ATPase activity; the enhancement decreased with increasing time of preincubation. Preincubation of cilia with high N -ethylmaleimide caused increasing inhibition. p -Hydroxymercuribenzoate was more potent than N -ethylmaleimide, usually causing only an inhibition which increased if the cilia were preincubated with p -hydroxymercuribenzoate in the absence of ATP. The pellet height response of these cilia, which serves as a convenient assay of some events related to ciliary motility, was inhibited about 50% by high concentrations of N -ethylmaleimide in the presence of ATP. Preincubation of the cilia with low concentrations of N -ethylmaleimide led to complete loss of the pellet height response. p -Hydroxymercuribenzoate was a more potent inhibitor of the pellet height response than N -ethylmaleimide; complete inhibition was attained even in the presence of ATP, while preincubation with a low concentration of p -hydroxymercuri-benzoate caused a very rapid loss of pellet height response. The ATPase activity of the crude dynein obtained by extraction of cilia and removal of the axonemes was approximately doubled by preincubation with N -ethylmaleimide. 30 S Dynein, obtained from the crude dynein by sedimentation on a sucrose density gradient, was slightly inhibited by N -ethylmaleimide; p -hydroxy-mercuribenzoate was more potent. The residual ATPase activity remaining on the axonemes after two extractions was also only inhibited by N -ethylmaleimide and by p -hydroxymercuribenzoate. These results demonstrated that SH groups influence both the ATPase activity of dynein and the pellet height response of glycerinated cilia. The possible significance of the similarity in enhancing effect of N -ethylmaleimide on cilia ATPase and on myosin ATPase was discussed." @default.
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• W1971330505 date "1974-03-01" @default.
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• W1971330505 title "On the role of sulfhydryl groups in the ATPase activity and pellet height response of Tetrahymena cilia" @default.
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• W1971330505 doi "https://doi.org/10.1016/0003-9861(74)90257-4" @default.
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