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Related Experiment Video

Updated: Jul 21, 2025

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FAT10 differentially stabilizes MYPT2 isoforms.

Seong Eun Song1, Yerin Kim1, Hoim Jeong1

  • 1Department of Microbiology and Immunology, Pusan National University School of Medicine, Yangsan, Republic of Korea.

Biochemical and Biophysical Research Communications
|July 28, 2023
PubMed
Summary

Human leukocyte antigen-F adjacent transcript 10 (FAT10) stabilizes a truncated form of myosin phosphatase targeting subunit 2 (MYPT2) isoform f by inhibiting its degradation. This interaction selectively affects MYPT2 isoforms, potentially modulating myosin phosphatase activity.

Keywords:
Human leukocyte antigen-F adjacent transcript 10 (FAT10)IsoformMyosin phosphatase (MP)Myosin phosphatase targeting subunit 2 (MYPT2)Ubiquitination

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Myosin phosphatase (MP) regulates muscle contraction and is crucial in physiological and pathological processes.
  • Myosin phosphatase targeting subunit 2 (MYPT2) modulates MP activity through interaction with protein phosphatase 1c.
  • MYPT2 isoforms exhibit functional differences, but their regulation remains unclear.

Purpose of the Study:

  • To investigate the interaction between Human leukocyte antigen-F adjacent transcript 10 (FAT10) and MYPT2 isoforms.
  • To determine how FAT10 affects the stability of MYPT2 isoform a and MYPT2 isoform f.
  • To elucidate the regulatory mechanisms of MYPT2 isoforms by FAT10.

Main Methods:

  • Co-immunoprecipitation assays to confirm FAT10 and MYPT2 interactions.
  • Western blotting to analyze protein levels of MYPT2 isoforms.
  • Ubiquitination assays to assess protein degradation pathways.

Main Results:

  • FAT10 interacts with both MYPT2 isoform a and MYPT2 isoform f.
  • FAT10 increases the levels of MYPT2 isoform f but not MYPT2 isoform a.
  • FAT10 stabilizes MYPT2 isoform f by inhibiting its ubiquitination and subsequent proteasomal degradation.

Conclusions:

  • FAT10 differentially affects MYPT2 isoforms, stabilizing the truncated MYPT2 isoform f.
  • FAT10-mediated stabilization of MYPT2 isoform f involves inhibition of the ubiquitin-proteasome pathway.
  • These findings suggest a novel regulatory mechanism for myosin phosphatase activity through isoform-specific modulation by FAT10.