Ozoe A, Sone M, Fukushima T, Kataoka N, Arai T, Chida K, Asano T, Hakuno F, Takahashi SI. Insulin receptor substrate-1 (IRS-1) forms a ribonucleoprotein complex associated with polysomes.
FEBS Lett 2013;
587:2319-24. [PMID:
23770097 DOI:
10.1016/j.febslet.2013.05.066]
[Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2013] [Revised: 05/27/2013] [Accepted: 05/27/2013] [Indexed: 11/18/2022]
Abstract
Insulin receptor substrates (IRSs) are known to play important roles in mediating intracellular insulin-like growth factors (IGFs)/insulin signaling. In this study, we identified components of messenger ribonucleoprotein (mRNP) as IRS-1-associated proteins. IRS-1 complex formation analysis revealed that IRS-1 is incorporated into the complexes of molecular mass more than 1000 kDa, which were disrupted by treatment with RNase. Furthermore, oligo(dT) beads precipitated IRS-1 from cell lysates, showing that the IRS-1 complexes contained messenger RNA. Taken together with the data that IRS-1 was fractionated into the polysome-containing high-density fractions, we concluded that IRS-1 forms the novel complexes with mRNPs.
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