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Lawrimore, Josh; Bloom, Kerry S; Salmon, E D
The Journal of cell biology, 11/2011, Letnik: 195, Številka: 4Journal Article
Cse4 is the budding yeast homologue of CENP-A, a modified histone H3 that specifies the base of kinetochores in all eukaryotes. Budding yeast is unique in having only one kinetochore microtubule attachment site per centromere. The centromere is specified by CEN DNA, a sequence-specific binding complex (CBF3), and a Cse4-containing nucleosome. Here we compare the ratio of kinetochore proximal Cse4-GFP fluorescence at anaphase to several standards including purified EGFP molecules in vitro to generate a calibration curve for the copy number of GFP-fusion proteins. Our results yield a mean of ~5 Cse4s, ~3 inner kinetochore CBF3 complexes, and ~20 outer kinetochore Ndc80 complexes. Our calibrated measurements increase 2.5-3-fold protein copy numbers at eukaryotic kinetochores based on previous ratio measurements assuming two Cse4s per budding yeast kinetochore. All approximately five Cse4s may be associated with the CEN nucleosome, but we show that a mean of three Cse4s could be located within flanking nucleosomes at random sites that differ between chromosomes.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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