Identification of karyopherin-alpha 2 as an Oct4 associated protein

Xiangqun Li; Lei Sun; Ying Jin

doi:10.1016/S1673-8527(08)60227-1

Volume 35 Issue 12

Dec. 2008

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Article Navigation > Journal of Genetics and Genomics > 2008 > 35(12): 723-728

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Identification of karyopherin-alpha 2 as an Oct4 associated protein

doi: 10.1016/S1673-8527(08)60227-1

Xiangqun Li^{a, b},
Lei Sun^c,
Ying Jin^{b, c}

a
Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing 100101, China
b
Shanghai Stem Cell Institute, Institutes of Medical Sciences, School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China
c
Key Laboratory of Stem Cell Biology, Institute of Health Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences/School of Medicine, Shanghai Jiao Tong University, Shanghai 200025, China

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Corresponding author: E-mail address: yjin@sibs.ac.cn (Ying Jin)
Received Date: 2008-03-27
Accepted Date: 2008-10-08
Rev Recd Date: 2008-10-04

Available Online: 2008-12-23

Publish Date: 2008-12-20

Abstract

Abstract

The POU domain transcription factor Oct4 is a master regulator in maintaining self-renewal and pluripotency of embryonic stem (ES) cells. To further explore the functional network of Oct4, the yeast two-hybrid system was used to search for Oct4 interacting proteins. PH domain (containing POU domain and homeodomain) of human OCT4 was used as a bait. From the human testis cDNA library, we identified a strong interaction between OCT4 and karyopherin-alpha 2 (KPNA-2). KPNA2 is involved in active nuclear import of proteins. This finding was confirmed by glutathione S-transferase pull-down and co-immunoprecipitation assays. The interaction between OCT4 and KPNA-2 was further mapped to multiple regions of the two proteins. In addition, we studied nuclear localization signal (NLS) of mouse Oct4 and demonstrated that it is essential for Oct4 nuclear localization. Thus, our data suggest that Oct4 nuclear localization may be mediated by its interaction with KPNA-2.
- Oct4,
- karyopherin-alpha 2,
- yeast two-hybrid,
- nuclear localization signal

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References(25)

References

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