DOI: 10.1083/jcb.200404120. Hypophosphorylated SR splicing factors transiently localize around active nucleolar organizing regions in telophase daughter nuclei

Hypophosphorylated SR splicing factors transiently localize around active nucleolar organizing regions in telophase daughter nuclei

10.1083/jcb.200404120

Crossref journal-article

Rockefeller University Press

The Journal of Cell Biology (291)

Abstract

Upon completion of mitosis, daughter nuclei assemble all of the organelles necessary for the implementation of nuclear functions. We found that upon entry into daughter nuclei, snRNPs and SR proteins do not immediately colocalize in nuclear speckles. SR proteins accumulated in patches around active nucleolar organizing regions (NORs) that we refer to as NOR-associated patches (NAPs), whereas snRNPs were enriched at other nuclear regions. NAPs formed transiently, persisting for 15–20 min before dissipating as nuclear speckles began to form in G1. In the absence of RNA polymerase II transcription, NAPs increased in size and persisted for at least 2 h, with delayed localization of SR proteins to nuclear speckles. In addition, SR proteins in NAPs are hypophosphorylated, and the SR protein kinase Clk/STY colocalizes with SR proteins in NAPs, suggesting that phosphorylation releases SR proteins from NAPs and their initial target is transcription sites. This work demonstrates a previously unrecognized role of NAPs in splicing factor trafficking and nuclear speckle biogenesis.

Authors 8

Paula A. Bubulya (first)
Kannanganattu V. Prasanth (additional)
Thomas J. Deerinck (additional)
Daniel Gerlich (additional)
Joel Beaudouin (additional)
Mark H. Ellisman (additional)
Jan Ellenberg (additional)
David L. Spector (additional)

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Dates

Type	When
Created	20 years, 10 months ago (Oct. 12, 2004, 10:58 a.m.)
Deposited	2 years, 1 month ago (July 22, 2023, 11:31 a.m.)
Indexed	4 months ago (April 17, 2025, 3:26 p.m.)
Issued	20 years, 10 months ago (Oct. 11, 2004)
Published	20 years, 10 months ago (Oct. 11, 2004)
Published Online	20 years, 10 months ago (Oct. 11, 2004)
Published Print	20 years, 10 months ago (Oct. 11, 2004)

Funders 0

None

BibTeX

@article{Bubulya_2004, title={Hypophosphorylated SR splicing factors transiently localize around active nucleolar organizing regions in telophase daughter nuclei}, volume={167}, ISSN={0021-9525}, url={http://dx.doi.org/10.1083/jcb.200404120}, DOI={10.1083/jcb.200404120}, number={1}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Bubulya, Paula A. and Prasanth, Kannanganattu V. and Deerinck, Thomas J. and Gerlich, Daniel and Beaudouin, Joel and Ellisman, Mark H. and Ellenberg, Jan and Spector, David L.}, year={2004}, month=oct, pages={51–63} }

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