The position of the GFP tag on actin affects the filament formation in mammalian cells

Akira Nagasaki*, Saku T. Kijima, Tenji Yumoto, Miku Imaizumi, Ayana Yamagishi, Hyonchol Kim, Chikashi Nakamura, Taro Q.P. Uyeda


研究成果: Article査読

22 被引用数 (Scopus)


Actin, a major component of microfilaments, is involved in various eukaryotic cellular functions. Over the past two decades, actin fused with fluorescent protein has been used as a probe to detect the organization and dynamics of the actin cytoskeleton in living eukaryotic cells. It is generally assumed that the expression of fusion protein of fluorescent protein does not disturb the distribution of endogenous actin throughout the cell, and that the distribution of the fusion protein reflects that of endogenous actin. However, we noticed that EGFP-β-actin caused the excessive formation of microfilaments in several mammalian cell lines. To investigate whether the position of the EGFP tag on actin affected the formation of filaments, we constructed an expression vector harboring a β-actin-EGFP gene. In contrast to EGFP-β-actin, cells expressing β-actin-EGFP showed actin filaments in a high background from the monomer actin in cytosol. Additionally, the detergent insoluble assay revealed that the majority of the detergent-insoluble cytoskeleton from cells expressing EGFP-β-actin was recovered in the pellet. Furthermore, we found that the expression of EGFP-β-actin affects the migration of NBT-L2b cells and the mechanical stiffness of U2OS cells. These results indicate that EGFP fused to the N-terminus of actin tend to form excessive actin filaments. In addition, EGFP-actin affects both the cellular morphological and physiological phenotypes as compared to actin-EGFP.

ジャーナルCell Structure and Function
出版ステータスPublished - 2017

ASJC Scopus subject areas

  • 生理学
  • 分子生物学
  • 細胞生物学


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