Mitosin/CENP-F as a negative regulator of activating transcription factor-4

Xubin Zhou, Rong Wang, Libin Fan, Yan Li, Li Ma, Zhenye Yang, Wei Yu, Naihe Jing, Xueliang Zhu

Research output: Contribution to journalArticlepeer-review

24 Scopus citations

Abstract

Mitosin/CENP-F is a human nuclear matrix protein with multiple leucine zipper motifs. Its accumulation in S-G2 phases and transient kinetochore localization in mitosis suggest a multifunctional protein for cell proliferation. Moreover, its murine and avian orthologs are implicated in myocyte differentiation. Here we report its interaction with activating transcription factor-4 (ATF4), a ubiquitous basic leucine zipper transcription factor important for proliferation, differentiation, and stress response. The C-terminal portion of mitosin between residues 2488 and 3113 bound to ATF4 through two distinct domains, one of which was a leucine zipper motif. Mitosin mutants containing these domains were able to either supershift or disrupt the ATF4-DNA complex. On the other hand, ATF4, but not ATF1-3 or ATF6, interacted with mitosin through a region containing the basic leucine zipper motif. Moreover, overexpression of full-length mitosin repressed the transactivation activity of ATF4 in dual luciferase-based reporter assays, while knocking down mitosin expression manifested the opposite effects. These findings suggest mitosin to be a negative regulator of ATF4 in interphase through direct interaction.

Original languageEnglish (US)
Pages (from-to)13973-13977
Number of pages5
JournalJournal of Biological Chemistry
Volume280
Issue number14
DOIs
StatePublished - Apr 8 2005

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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