Differential regulation of CENP-A and histone H3 phosphorylation in G2/M - PubMed (original) (raw)
. 2001 Feb;114(Pt 4):653-61.
doi: 10.1242/jcs.114.4.653.
Affiliations
- PMID: 11171370
- DOI: 10.1242/jcs.114.4.653
Differential regulation of CENP-A and histone H3 phosphorylation in G2/M
S G Zeitlin et al. J Cell Sci. 2001 Feb.
Erratum in
- J Cell Sci 2001 May;114(Pt 10):1799. Sullivan K [corrected to Sullivan KF]
Abstract
After DNA replication, cells condense their chromosomes in order to segregate them during mitosis. The condensation process as well as subsequent segregation requires phosphorylation of histone H3 at serine 10. Histone H3 phosphorylation initiates during G2 in pericentric foci prior to H3 phosphorylation in the chromosome arms. Centromere protein A (CENP-A), a histone H3-like protein found uniquely at centromeres, contains a sequence motif similar to that around H3 Ser10, suggesting that CENP-A phosphorylation might be linked to pericentric initiation of histone H3 phosphorylation. To test this hypothesis, we generated peptide antibodies against the putative phosphorylation site of CENP-A. ELISA, western blot and immunocytochemical analyses show that CENP-A is phosphorylated at the shared motif. Simultaneous co-detection demonstrates that phosphorylation of CENP-A and histone H3 are separate events in G2/M. CENP-A phosphorylation occurs after both pericentric initiation and genome-wide stages of histone H3 phosphorylation. Quantitative immunocytochemistry reveals that CENP-A phosphorylation begins in prophase and reaches maximal levels in prometaphase. CENP-A phosphoepitope reactivity is lost during anaphase and becomes undetectable in telophase cells. Duplication of prekinetochores, detected as the doubling of CENP-A foci, occurs prior to complete histone H3 phosphorylation in G2. Mitotic phosphorylation of histone H3-family proteins shows tight spatial and temporal control, occurring in three phases: (1) pericentric H3 phosphorylation, (2) chromosome arm H3 phosphorylation and (3) CENP-A phosphorylation at kinetochores. These observations reveal new cytological landmarks characteristic of G2 progression.
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