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Proc Natl Acad Sci U S A November 11, 1997; 94 (23): 12378-83.

A method that allows the assembly of kinetochore components onto chromosomes condensed in clarified Xenopus egg extracts.

Desai A , Deacon HW , Walczak CE , Mitchison TJ .

Kinetochores are complex macromolecular structures that link mitotic chromosomes to spindle microtubules. Although a small number of kinetochore components have been identified, including the kinesins CENP-E and XKCM1 as well as cytoplasmic dynein, neither how these and other proteins are organized to produce a kinetochore nor their exact functions within this structure are understood. For this reason, we have developed an assay that allows kinetochore components to assemble onto discrete foci on in vitro-condensed chromosomes. The source of the kinetochore components is a clarified cell extract from Xenopus eggs that can be fractionated or immunodepleted of individual proteins. Kinetochore assembly in these clarified extracts requires preincubating the substrate sperm nuclei in an extract under low ATP conditions. Immunodepletion of XKCM1 from the extracts prevents the localization of kinetochore-associated XKCM1 without affecting the targeting of CENP-E and cytoplasmic dynein or the binding of monomeric tubulin to the kinetochore. Extension of this assay for the analysis of other components should help to dissect the protein-protein interactions involved in kinetochore assembly and function.

PubMed ID: 9356457
PMC ID: PMC24953
Article link: Proc Natl Acad Sci U S A
Grant support: [+]
Genes referenced: cenpe dnai1 dync1li1 kif2c

References [+] :
Balczon, Tubulin interaction with kinetochore proteins: analysis by in vitro assembly and chemical cross-linking. 1987, Pubmed

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