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. 2002 Nov;40(1-3):85–92. doi: 10.1023/A:1023970222898

Identification of ribosomal protein S3a as a candidate for a novel PI 3-kinase target in the nucleus

Norihisa Hamaguchi 1, Tsutomu Ohdaira 1, Azusa Shinohara 2, Akihiro Iwamatsu 2, Sayoko Ihara 1, Yasuhisa Fukui 1,✉
PMCID: PMC3449526  PMID: 19003108

Abstract

Phosphatidylinositol 3,4,5-trisphosphate (PIP3) is an important lipid second messenger that mediates various cell responses. We have searched for the nuclear PIP3 binding proteins using PIP3 analogue beads. A 33 kD protein was detected in this method, which was identified as ribosomal protein S3a by the mass spectrometric analysis. The recombinant S3a protein bound specifically to PIP3. S3a localized not only in the cytosol but also in the nucleus. Interestingly, not cytosolic but nuclear S3a bound to PIP3, suggesting different roles of S3a in the cytosol and the nucleus.

Keywords: nucleus, phosphatidylinositol 3-kinase, phosphatidylinositol 3, 4, 5-trisphosphate, ribosomal protein S3a

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