The core binding factor (CBF) α interaction domain and the smooth muscle myosin heavy chain (SMMHC) segment of CBFβ-SMMHC are both required to slow cell proliferation

Wangsen Cao, Neeraj Adya, Martin Britos-Bray, P. Paul Liu, Alan D. Friedman

Research output: Contribution to journalArticlepeer-review

Abstract

We have expressed several variants of core binding factor β (CBFβ)- smooth muscle myosin heavy chain (SMMHC) from the metallothionein promoter in Ba/F3 cells. Deletion of amino acids 2-11 from the CBFβ segment, required for interaction with CBFα, prevented CBFβ-SMMHC from inhibiting CBF DNA binding and cell cycle progression. Deletion of 283 carboxyl-terminal residues from the SMMHC domain, required for multimerization, also inactivated CBFβ-SMMHC. Nuclear expression of CBFβ(Δ2-11)-SMMHC was decreased relative to CBFβ-SMMHC. CBFβ(Δ2-11)-SMMHC linked to a nuclear localization signal still did not slow cell growth. The ability of each CBFβ-SMMHC variant to inhibit CBF DNA binding and cell proliferation correlated with its ability to inhibit transactivation by an AML1-VP16 fusion protein. Thus, CBFβ-SMMHC slows cell cycle progression from G1 to S phase by inhibiting CBF DNA binding and transactivation.

Original languageEnglish (US)
Pages (from-to)31534-31540
Number of pages7
JournalJournal of Biological Chemistry
Volume273
Issue number47
DOIs
StatePublished - Nov 20 1998

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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