skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Transcription-dependent nucleolar cap localization and possible nuclear function of DExH RNA helicase RHAU

Abstract

RHAU (RNA helicase associated with AU-rich element) is a DExH protein originally identified as a factor accelerating AU-rich element-mediated mRNA degradation. The discovery that RHAU is predominantly localized in the nucleus, despite mRNA degradation occurring in the cytoplasm, prompted us to consider the nuclear functions of RHAU. In HeLa cells, RHAU was found to be localized throughout the nucleoplasm with some concentrated in nuclear speckles. Transcriptional arrest altered the localization to nucleolar caps, where RHAU is closely localized with RNA helicases p68 and p72, suggesting that RHAU is involved in transcription-related RNA metabolism in the nucleus. To see whether RHAU affects global gene expression transcriptionally or posttranscriptionally, we performed microarray analysis using total RNA from RHAU-depleted HeLa cell lines, measuring both steady-state mRNA levels and mRNA half-lives by actinomycin D chase. There was no change in the half-lives of most transcripts whose steady-state levels were affected by RHAU knockdown, suggesting that these transcripts are subjected to transcriptional regulation. We propose that RHAU has a dual function, being involved in both the synthesis and degradation of mRNA in different subcellular compartments.

Authors:
; ; ;  [1];  [1]
  1. Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel (Switzerland)
Publication Date:
OSTI Identifier:
21045964
Resource Type:
Journal Article
Journal Name:
Experimental Cell Research
Additional Journal Information:
Journal Volume: 314; Journal Issue: 6; Other Information: DOI: 10.1016/j.yexcr.2008.01.006; PII: S0014-4827(08)00018-9; Copyright (c) 2008 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0014-4827
Country of Publication:
United States
Language:
English
Subject:
60 APPLIED LIFE SCIENCES; ACTINOMYCIN; BIOSYNTHESIS; CYTOPLASM; HALF-LIFE; HELA CELLS; METABOLISM; PROTEINS; RNA; STEADY-STATE CONDITIONS; TRANSCRIPTION

Citation Formats

Iwamoto, Fumiko, Stadler, Michael, Chalupnikova, Katerina, Oakeley, Edward, and Nagamine, Yoshikuni. Transcription-dependent nucleolar cap localization and possible nuclear function of DExH RNA helicase RHAU. United States: N. p., 2008. Web. doi:10.1016/j.yexcr.2008.01.006.
Iwamoto, Fumiko, Stadler, Michael, Chalupnikova, Katerina, Oakeley, Edward, & Nagamine, Yoshikuni. Transcription-dependent nucleolar cap localization and possible nuclear function of DExH RNA helicase RHAU. United States. https://doi.org/10.1016/j.yexcr.2008.01.006
Iwamoto, Fumiko, Stadler, Michael, Chalupnikova, Katerina, Oakeley, Edward, and Nagamine, Yoshikuni. 2008. "Transcription-dependent nucleolar cap localization and possible nuclear function of DExH RNA helicase RHAU". United States. https://doi.org/10.1016/j.yexcr.2008.01.006.
@article{osti_21045964,
title = {Transcription-dependent nucleolar cap localization and possible nuclear function of DExH RNA helicase RHAU},
author = {Iwamoto, Fumiko and Stadler, Michael and Chalupnikova, Katerina and Oakeley, Edward and Nagamine, Yoshikuni},
abstractNote = {RHAU (RNA helicase associated with AU-rich element) is a DExH protein originally identified as a factor accelerating AU-rich element-mediated mRNA degradation. The discovery that RHAU is predominantly localized in the nucleus, despite mRNA degradation occurring in the cytoplasm, prompted us to consider the nuclear functions of RHAU. In HeLa cells, RHAU was found to be localized throughout the nucleoplasm with some concentrated in nuclear speckles. Transcriptional arrest altered the localization to nucleolar caps, where RHAU is closely localized with RNA helicases p68 and p72, suggesting that RHAU is involved in transcription-related RNA metabolism in the nucleus. To see whether RHAU affects global gene expression transcriptionally or posttranscriptionally, we performed microarray analysis using total RNA from RHAU-depleted HeLa cell lines, measuring both steady-state mRNA levels and mRNA half-lives by actinomycin D chase. There was no change in the half-lives of most transcripts whose steady-state levels were affected by RHAU knockdown, suggesting that these transcripts are subjected to transcriptional regulation. We propose that RHAU has a dual function, being involved in both the synthesis and degradation of mRNA in different subcellular compartments.},
doi = {10.1016/j.yexcr.2008.01.006},
url = {https://www.osti.gov/biblio/21045964}, journal = {Experimental Cell Research},
issn = {0014-4827},
number = 6,
volume = 314,
place = {United States},
year = {Tue Apr 01 00:00:00 EDT 2008},
month = {Tue Apr 01 00:00:00 EDT 2008}
}