Characterization of the novel interaction between muskelin and TBX20, a critical cardiogenic transcription factor

Paige DeBenedittis, Cristina Harmelink, Yunjia Chen, Qin Wang, Kai Jiao

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The genetic regulation necessary for the formation of a four-chambered heart is tightly regulated by transcription factors such as TBX20, a member of the T-box (TBX) transcription factor family. TBX20 is critical for proper cardiogenesis and is expressed in the heart throughout development. Missense mutations in TBX20 have been found in patients with congenital heart defects (CHD). Characterization of modifiers of TBX20 activity will help elucidate the genetic mechanisms of heart development and CHD. A yeast two-hybrid assay screening an embryonic mouse heart cDNA library with TBX20b as bait was used to identify potential modifiers of TBX20 activity and identified an interaction with muskelin (MKLN1), a primarily cytoplasmic protein with potential roles in signal transduction machinery scaffolding and nucleocytoplasmic protein shuttling. In cellular studies, MKLN1 directly binds to the T-box DNA-binding domain of only the TBX20b isoform by its kelch repeats domain. Immunostaining of mammalian cells transfected with tagged TBX20b and MKLN1 revealed colocalization primarily in the cytoplasm. Immunohistochemistry analysis of embryonic mouse hearts reveals coexpression in the developing endocardial valvular and myocardial interventricular cells. This novel interaction between TBX20b and MKLN1 may help elucidate new regulatory mechanisms within heart development.

Original languageEnglish (US)
Pages (from-to)338-343
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume409
Issue number2
DOIs
StatePublished - Jun 3 2011
Externally publishedYes

Keywords

  • Heart development
  • MKLN1
  • Protein-protein interaction
  • TBX20
  • Transcription factor
  • Yeast two-hybrid

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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