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Molecular and Cellular Biology, September 2000, p. 6537-6549, Vol. 20, No. 17
0270-7306/00/$04.00+0
A Bromodomain Protein, MCAP, Associates with
Mitotic Chromosomes and Affects G2-to-M
Transition
Anup
Dey,1
Jan
Ellenberg,2,
Andrea
Farina,1
Allen E.
Coleman,3
Tetsuo
Maruyama,1,
Selvaggia
Sciortino,1
Jennifer
Lippincott-Schwartz,2 and
Keiko
Ozato1,*
Laboratory of Molecular Growth
Regulation,1 and Cell Biology and
Metabolism Branch,2 National Institute of
Child Health and Human Development, and Laboratory of
Genetics, Division of Basic Sciences, National Cancer
Institute,3 National Institutes of Health,
Bethesda, Maryland 20892-2753
Received 22 November 1999/Returned for modification 2 February
2000/Accepted 2 June 2000
We describe a novel nuclear factor called mitotic
chromosome-associated protein (MCAP), which belongs to the poorly
understood BET subgroup of the bromodomain superfamily. Expression of
the 200-kDa MCAP was linked to cell division, as it was induced by growth stimulation and repressed by growth inhibition. The most notable
feature of MCAP was its association with chromosomes during mitosis,
observed at a time when the majority of nuclear regulatory factors were
released into the cytoplasm, coinciding with global cessation of
transcription. Indicative of its predominant interaction with
euchromatin, MCAP localized on mitotic chromosomes with exquisite specificity: (i) MCAP-chromosome association became evident subsequent to the initiation of histone H3 phosphorylation and early chromosomal condensation; and (ii) MCAP was absent from centromeres, the sites of
heterochromatin. Supporting a role for MCAP in G2/M
transition, microinjection of anti-MCAP antibody into HeLa cell nuclei
completely inhibited the entry into mitosis, without abrogating the
ongoing DNA replication. These results suggest that MCAP plays a role in a process governing chromosomal dynamics during mitosis.
*
Corresponding author. Mailing address: Laboratory of
Molecular Growth Regulation, National Institute of Child Health and
Human Development. Bldg. 6, Rm. 2A01, National Institutes of Health, Bethesda, MD 20892-2753. Phone: (301) 496-9184. Fax: (301) 480-9354. E-mail: ozatok{at}nih.gov.

Present address: Gene Expression and Cell Biology/Biophysics
Programmes, European Molecular Biology Laboratory, Heidelberg,
Germany.

Present address: Keio University School of Medicine, Shinjuku-ku,
Tokyo 160-8582,
Japan.
Molecular and Cellular Biology, September 2000, p. 6537-6549, Vol. 20, No. 17
0270-7306/00/$04.00+0
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