A role for transportin in deposition of TTP to cytoplasmic RNA granules and mRNA decay.
A role for transportin in deposition of TTP to cytoplasmic RNA granules and mRNA decay.
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DOI:
10.1093/nar/gkp717
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发表时间:
2009-10
影响因子:
14.9
通讯作者:
Tarn WY
中科院分区:
文献类型:
--
作者:
Chang WL;Tarn WY
Importin-β family members, which shuttle between the nucleus and the cytoplasm, are essential for nucleocytoplasmic transport of macromolecules. We attempted to explore whether importin-β family proteins change their cellular localization in response to environmental change. In this report, we show that transportin (TRN) was minimally detected in cytoplasmic processing bodies (P-bodies) under normal cell conditions but largely translocated to stress granules (SGs) in stressed cells. Fluorescence recovery after photobleaching analysis indicated that TRN moves rapidly in and out of cytoplasmic granules. Depletion of TRN greatly enhanced P-body formation but did not affect the number or size of SGs, suggesting that TRN or its cargo(es) participates in cellular function of P-bodies. Accordingly, TRN associated with tristetraprolin (TTP) and its AU-rich element (ARE)-containing mRNA substrates. Depletion of TRN increased the number of P-bodies and stabilized ARE-containing mRNAs, as observed with knockdown of the 5′–3′ exonuclease Xrn1. Moreover, depletion of TRN retained TTP in P-bodies and meanwhile reduced the fraction of mobile TTP to SGs. Therefore, our data together suggest that TRN plays a role in trafficking of TTP between the cytoplasmic granules and whereby modulates the stability of ARE-containing mRNAs.
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影响因子:
7.8
作者:
Buchan, J. Ross;Muhlrad, Denise;Parker, Roy
通讯作者:
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影响因子:
14.9
作者:
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DOI:
10.1083/jcb.200504039
发表时间:
2005-09-12
期刊:
The Journal of cell biology
影响因子:
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作者:
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通讯作者:
Sonenberg N
影响因子:
14.9
作者:
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通讯作者:
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影响因子:
3.3
作者:
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通讯作者:
Tarn, Woan-Yuh