Visualization of subunit interactions and ternary complexes of protein phosphatase 2A in mammalian cells

Mo Shu-Ting, Chiang Shang-Ju, Lai Tai-Yu, Cheng Yu-Ling, Chung Cheng-En, C. H.Kuo Spencer, M. Reece Kelie, Chen Yung-Cheng, Chang Nan-Shan, E. Wadzinski Brian, Chiang Chi-Wu

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6 Citations (Scopus)


Protein phosphatase 2A (PP2A) is a ubiquitous phospho-serine/threonine phosphatase that controls many diverse cellular functions. The predominant form of PP2A is a heterotrimeric holoenzyme consisting of a scaffolding A subunit, a variable regulatory B subunit, and a catalytic C subunit. The C subunit also associates with other interacting partners, such as α4, to form non-canonical PP2A complexes. We report visualization of PP2A complexes in mammalian cells. Bimolecular fluorescence complementation (BiFC) analysis of PP2A subunit interactions demonstrates that the B subunit plays a key role in directing the subcellular localization of PP2A, and confirms that the A subunit functions as a scaffold in recruiting the B and C subunits to form a heterotrimeric holoenzyme. BiFC analysis also reveals that a4 promotes formation of the AC core dimer. Furthermore, we demonstrate visualization of specific ABC holoenzymes in cells by combining BiFC and fluorescence resonance energy transfer (BiFC-FRET). Our studies not only provide direct imaging data to support previous biochemical observations on PP2A complexes, but also offer a promising approach for studying the spatiotemporal distribution of individual PP2A complexes in cells.

Original languageEnglish
JournalPloS one
Issue number12
Publication statusPublished - 2014 Dec 23

All Science Journal Classification (ASJC) codes

  • General


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