The binding of a ciliary microtubule plus-end binding protein complex to microtubules is regulated by ciliary protein kinase and phosphatase activities.

作者: R. H. Himes , W. L. Dentler , Wen Wang

DOI: 10.1016/S0021-9258(17)31826-4

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摘要: Using a human autoimmune CREST antiserum, we identified 97-kDa polypeptide at the plus ends of Tetrahymena ciliary microtubules and an antigen associated with mammalian kinetochores (Miller, J.M., Wang, W., Balczon, R., Dentler, W.L. (1990) J. Cell. Biol. 110, 703-714). The protein is part 1,500-2,000-kDa complex that can be released from in vitro assembled brain ATP gamma S (Wang, Suprenant, K.A., W. L. (1993) Chem. 268, 24796-24807). Here show ATP-dependent release inhibited, concentration-dependent manner, by calf intestine phosphatase kinase inhibitor 6-dimethylaminopurine. Sodium orthovanadate, phosphotyrosine inhibitor, stimulated microtubules. Therefore, fraction contains both activities, selective inhibition these activities necessary for binding When incubated [gamma-32P]ATP, portion phosphorylated as are several other polypeptides it. sensitivity requires low molecular weight heat-stable factor axonemes. These results suggest association regulated phosphorylation axoneme-associated kinases phosphatases.

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