Crossref journal-article
Rockefeller University Press
The Journal of Cell Biology (291)
Abstract

Using electron tomography, we have analyzed whether the Balbiani ring (BR) pre-mRNP particles in transit from the gene to the nuclear pore complex (NPC) are bound to any structure that could impair free diffusion through the nucleoplasm. We show that one-third of the BR particles are in contact with thin connecting fibers (CFs), which in some cases merge into large fibrogranular clusters. The CFs have a specific protein composition different from that of BR particles, as shown by immuno-EM. Moreover, we have identified hrp65 as one of the protein components of the CFs. The sequencing of hrp65 cDNA reveals similarities with hnRNP proteins and splicing factors. However, hrp65 is likely to have a different function because it does not bind to nascent pre-mRNA and is not part of the pre-mRNP itself. Taken together, our observations indicate that pre-mRNPs are not always freely diffusible in the nucleoplasm but interact with fibers of specific structure and composition, which implies that some of the posttranscriptional events that the pre-mRNPs undergo before reaching the NPC occur in a bound state.

Bibliography

Miralles, F., Öfverstedt, L.-G., Sabri, N., Aissouni, Y., Hellman, U., Skoglund, U., & Visa, N. (2000). Electron Tomography Reveals Posttranscriptional Binding of Pre-Mrnps to Specific Fibers in the Nucleoplasm. The Journal of Cell Biology, 148(2), 271–282.

Authors 7
  1. Francesc Miralles (first)
  2. Lars-Göran Öfverstedt (additional)
  3. Nafiseh Sabri (additional)
  4. Youssef Aissouni (additional)
  5. Ulf Hellman (additional)
  6. Ulf Skoglund (additional)
  7. Neus Visa (additional)
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Dates
Type When
Created 23 years ago (July 26, 2002, 12:45 p.m.)
Deposited 2 years ago (July 28, 2023, 9:32 p.m.)
Indexed 1 year ago (Aug. 12, 2024, 9:11 a.m.)
Issued 25 years, 7 months ago (Jan. 24, 2000)
Published 25 years, 7 months ago (Jan. 24, 2000)
Published Online 25 years, 7 months ago (Jan. 24, 2000)
Published Print 25 years, 7 months ago (Jan. 24, 2000)
Funders 0

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@article{Miralles_2000, title={Electron Tomography Reveals Posttranscriptional Binding of Pre-Mrnps to Specific Fibers in the Nucleoplasm}, volume={148}, ISSN={1540-8140}, url={http://dx.doi.org/10.1083/jcb.148.2.271}, DOI={10.1083/jcb.148.2.271}, number={2}, journal={The Journal of Cell Biology}, publisher={Rockefeller University Press}, author={Miralles, Francesc and Öfverstedt, Lars-Göran and Sabri, Nafiseh and Aissouni, Youssef and Hellman, Ulf and Skoglund, Ulf and Visa, Neus}, year={2000}, month=jan, pages={271–282} }