Novel heterotrimeric kinesin-related protein purified from sea urchin eggs

D. G. Cole, S. W. Chinn, K. P. Wedaman, K. Hall, T. Vuong, J. M. Scholey

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KINESIN heavy chain and kinesin-related polypeptides (KRPs) comprise a family of motor proteins with diverse intracellular transport functions1-7. Using pan-kinesin peptide antibodies that react with these proteins8,9, we have previously purified from sea urchin eggs a trimeric microtubule-binding and bundling protein, KRP(85/95) (ref. 8) comprising subunits of Mr 115,000 (115K), 95K and 85K. We report here that kinesin-related genes encode the 85K and 95K subunits, and that the protein can be immunoprecipitated from cytosol as a trimeric complex using an 85K monoclonal antibody. We also find that purified KRP(85/95) directs movements towards the 'plus' ends of microtubules. To our knowledge, this protein is the first kinesin-related motor to be purified from its natural host cell in a native multimeric state.

Original languageEnglish (US)
Pages (from-to)268-270
Number of pages3
Issue number6452
StatePublished - Nov 18 1993


ASJC Scopus subject areas

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Cite this

Cole, D. G., Chinn, S. W., Wedaman, K. P., Hall, K., Vuong, T., & Scholey, J. M. (1993). Novel heterotrimeric kinesin-related protein purified from sea urchin eggs. Nature, 366(6452), 268-270.