title: Functional analysis of the spindle-checkpoint proteins using an in vitro ubiquitination assay.
abstract: The spindle checkpoint helps to ensure the fidelity of chromosome segregation during mitosis and meiosis. In response to sister chromatids not properly attached to the mitotic spindle, this checkpoint blocks the activity of a large ubiquitin protein ligase complex, called the anaphase-promoting complex (APC) or cyclosome. This chapter describes the detailed protocols of an in vitro ubiquitination assay reconstituted with purified APC, cofactors, other ubiquitination enzymes, and the spindle-checkpoint proteins. This assay is extremely useful in dissecting the biochemical functions of various spindle-checkpoint proteins.
authors.affiliation: Department of Pharmacology, UT Southwestern Medical Center, Dallas, USA.
authors.forename: Zhanyun
authors.initials: Z
authors.lastname: Tang
authors.forename: Hongtao
authors.initials: H
authors.lastname: Yu
mesh_terms: D064173:Anaphase-Promoting Complex-Cyclosome; D000818:Animals; D016367:Baculoviridae / Q000235:genetics; D020090:Chromosome Segregation; D006367:HeLa Cells / Q000378:metabolism; D006801:Humans; D008938:Mitosis; D011994:Recombinant Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D008941:Spindle Apparatus / Q000502:physiology*; D043743:Ubiquitin-Protein Ligase Complexes / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism*; D014452:Ubiquitins / Q000378:metabolism*; D014981:Xenopus / Q000378:metabolism
chemical_list: D011994:Recombinant Proteins; D014452:Ubiquitins; D043743:Ubiquitin-Protein Ligase Complexes; D064173:Anaphase-Promoting Complex-Cyclosome