We studied the possibility of using the spermatozoa of the loach Misgurnus fossilis L. in the identification of centrosome proteins. It has been shown that the centrosome of the loach spermatozoa consists of a pair of centrioles of the standard structure and contains the marker protein γ-tubulin, cytoplasmic microtubules branch out from it, and it does not contain any additional structures characteristic of the centrosomes of spermatozoa of many other fishes. A preparation enriched with intact centrosomes was obtained from the loach spermatozoa. These centrosomes contained γ-tubulin, although they had lost their ability to induce the polymerization of microtubules. The preparation of loach centrosomes was successfully used to obtain a set of monoclonal antibodies against the mammalian centrosome. A new protein kinase LOSTEK was identified with the help of one of these monoclonal antibodies, SN2-3D2, which was localized in the centrosome and then on microtubules in both loach spermatozoa and cultured mammalian cells. Hence, the loach spermatozoa are a promising means to identify new proteins in the mammalian centrosome.
Russian Journal of Developmental Biology – Springer Journals
Published: Oct 9, 2004
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