Insulin receptor substrate-1 associates with small nucleolar RNA which contributes to ribosome biogenesis.
Insulin receptor substrate-1 associates with small nucleolar RNA which contributes to ribosome biogenesis.
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DOI:
10.3389/fendo.2014.00024
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发表时间:
2014
影响因子:
5.2
通讯作者:
Takahashi S
中科院分区:
文献类型:
--
作者:
Ozoe A;Sone M;Fukushima T;Kataoka N;Chida K;Asano T;Hakuno F;Takahashi S
Insulin receptor substrates (IRSs) are well known to play crucial roles in mediating intracellular signals of insulin-like growth factors (IGFs)/insulin. Previously, we showed that IRS-1 forms high molecular mass complexes containing RNAs. To identify RNAs in IRS-1 complexes, we performed ultraviolet (UV) cross-linking and immunoprecipitation analysis using HEK293 cells expressing FLAG–IRS-1 and FLAG–IRS-2. We detected the radioactive signals in the immunoprecipitates of FLAG–IRS-1 proportional to the UV irradiation, but not in the immunoprecipitates of FLAG–IRS-2, suggesting the direct contact of RNAs with IRS-1. RNAs cross-linked to IRS-1 were then amplified by RT-PCR, followed by sequence analysis. We isolated sequence tags attributed to 25 messenger RNAs and 8 non-coding RNAs, including small nucleolar RNAs (snoRNAs). We focused on the interaction of IRS-1 with U96A snoRNA (U96A) and its host Rack1 (receptor for activated C kinase 1) pre-mRNA. We confirmed the interaction of IRS-1 with U96A, and with RACK1 pre-mRNA by immunoprecipitation with IRS-1 followed by Northern blotting or RT-PCR analyses. Mature U96A in IRS-1−/− mouse embryonic fibroblasts was quantitatively less than WT. We also found that a part of nuclear IRS-1 is localized in the Cajal body, a nuclear subcompartment where snoRNA mature. The unanticipated function of IRS-1 in snoRNA biogenesis highlights the potential of RNA-associated IRS-1 complex to open a new line of investigation to dissect the novel mechanisms regulating IGFs/insulin-mediated biological events.
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影响因子:
4.8
作者:
Lassak, A;Del Valle, L;Reiss, K
通讯作者:
Reiss, K
影响因子:
4.5
作者:
Ooi, SL;Samarsky, DA;Boeke, JD
通讯作者:
Boeke, JD
影响因子:
16
作者:
Hirose, T;Shu, MD;Steitz, JA
通讯作者:
Steitz, JA
DOI:
10.1083/jcb.201107093
发表时间:
2011-10-03
期刊:
The Journal of cell biology
影响因子:
--
作者:
Ninomiya K;Kataoka N;Hagiwara M
通讯作者:
Hagiwara M
影响因子:
4.8
作者:
Chen, J;Wu, A;Baserga, R
通讯作者:
Baserga, R