Cargo-activated ATpase activity of kinesin

Ya Jiang Ming Ya Jiang, Michael Sheetz, J. Gelles, K. Johnson

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Abstract

We have measured the ATPase activity of squid optic lobe kinesin bound to polystyrene beads in the presence of microtubules. We find that there is a substantial increase (>10-fold) in the microtubule-activated ATPase activity for bead-bound kinesin over free kinesin. We tentatively attribute such cargo-activated ATPase activity to the presence of a self-inhibited form of kinesin in solution, which becomes activated when bound to a bead in the presence of α-casein. Further experiments are underway to untravel this phenomenon and, in addition, to associate the traveling distance of beads with the observed ATPase rate to determine the average number of ATP consumed per kinesin-bead per micron of travel along microtubule.

Original languageEnglish (US)
JournalBiophysical Journal
Volume68
Issue number4 SUPPL.
StatePublished - Jan 1 1995
Externally publishedYes

ASJC Scopus subject areas

  • Biophysics

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    Ming Ya Jiang, Y. J., Sheetz, M., Gelles, J., & Johnson, K. (1995). Cargo-activated ATpase activity of kinesin. Biophysical Journal, 68(4 SUPPL.).