Nonsense-mediated mRNA decay factor Upf2 exists in both the nucleoplasm and the cytoplasm Corrigendum in /10.3892/mmr.2017.7593

Tatsuno,Takanori; Nakamura,Yuka; Ma,Shaofu; Tomosugi,Naohisa; Ishigaki,Yasuhito

doi:10.3892/mmr.2016.5331

Nonsense-mediated mRNA decay factor Upf2 exists in both the nucleoplasm and the cytoplasm

Corrigendum in: /10.3892/mmr.2017.7593

Authors:
- Takanori Tatsuno
- Yuka Nakamura
- Shaofu Ma
- Naohisa Tomosugi
- Yasuhito Ishigaki
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Affiliations: Medical Research Institute, Kanazawa Medical University, Kahoku, Ishikawa 920‑0293, Japan
Published online on: May 24, 2016 https://doi.org/10.3892/mmr.2016.5331
Pages: 655-660
Copyright: © Tatsuno et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

Upf2 protein predominantly localizes to the cytoplasmic fraction, and binds to the exon junction complex (EJC) on spliced mRNA. The present study aimed to determine the cellular site where the interaction between Upf2 and EJC occurs. First, the cell lysate was fractionated into the cytoplasm and nucleoplasm, and western blotting to detect levels of Upf2 protein was performed. Upf2 was clearly detected in the cytoplasm and in the nucleoplasm. Secondly, immunostaining was performed, and the majority of Upf2 was detected in the cytoplasmic perinuclear region; a small quantity of Upf2 was detected in the intranuclear region. RNase treatment of the cells reduced the Upf2 immunostained signal. The immunopurified fractions containing nuclear and cytoplasmic Upf2 also contained one of the EJC core factors, RBM8A. These results implied the existence of Upf2 in the nucleoplasm and the cytoplasm, and it appeared to be involved in the construction of the mRNA complex. In order to verify the construction of Upf2‑binding EJC in the nucleoplasm, an in situ proximity ligation assay was performed with anti‑Upf2 and anti‑RBM8A antibodies. These results demonstrated that their interaction occurred not only in the cytoplasmic region, but also in the intranuclear region. Taken together, these results suggested that Upf2 combines with EJC in both the cytoplasmic and the intranuclear fractions, and that it is involved in mRNA metabolism in human cells.

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