Localization of myosin phosphatase target subunit and its mutants

Yue Wu, Andrea Murányi, F. Erdődi, David J. Hartshorne

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Transient transfection of NIH3T3 cells with various constructs of myosin phosphatase target subunit (MYPT1) and GFP showed distinct cellular localizations. Constructs containing the N-terminal nuclear localization signals (NLS), i.e. full-length MYPT1 and N-terminal MYPT1 fragments, were concentrated in the nucleus. Full-length chicken and human MYPT1-GFP showed discrete nuclear foci. Deletion of the N-terminal NLS or use of central or C-terminal MYPT1 fragments did not show unique nuclear distributions (C-terminal NLS are present). Transient transfection of NIH3T3 cells (in the presence of serum) with full-length MYPT1-GFP caused a marked decrease in number of attached cells, an apparent block in the cell cycle prior to M phase and signs of increased apoptosis. Under conditions of serum starvation the unique nuclear localization of MYPT1-GFP was not found and there was no marked decrease in the number of attached cells (after 48 h). Stable transfection of HEK 293 cells with GFP-MYPT1 was obtained. MYPT1 and its N-terminal mutants bound to retinoblastoma protein (Rb), raising the possibility that Rb is implicated in the effects caused by overexpression of MYPT1.

Original languageEnglish
Pages (from-to)123-134
Number of pages12
JournalJournal of Muscle Research and Cell Motility
Volume26
Issue number2
DOIs
Publication statusPublished - Apr 2005

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Myosin-Light-Chain Phosphatase
Nuclear Localization Signals
Transfection
Retinoblastoma Protein
Cell Count
HEK293 Cells
Cells
Apoptosis
Starvation
Serum
Cell Division
Chickens
Cell Cycle

ASJC Scopus subject areas

  • Physiology
  • Clinical Biochemistry
  • Endocrinology
  • Cell Biology

Cite this

Localization of myosin phosphatase target subunit and its mutants. / Wu, Yue; Murányi, Andrea; Erdődi, F.; Hartshorne, David J.

In: Journal of Muscle Research and Cell Motility, Vol. 26, No. 2, 04.2005, p. 123-134.

Research output: Contribution to journalArticle

Wu, Yue ; Murányi, Andrea ; Erdődi, F. ; Hartshorne, David J. / Localization of myosin phosphatase target subunit and its mutants. In: Journal of Muscle Research and Cell Motility. 2005 ; Vol. 26, No. 2. pp. 123-134.
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