Targets of the Tal1 transcription factor in erythrocytes: E2 ubiquitin conjugase regulation by Tal1

J Biol Chem. 2010 Feb 19;285(8):5338-46. doi: 10.1074/jbc.M109.030296. Epub 2009 Dec 22.

Abstract

The Tal1 transcription factor is essential for the development of the hematopoietic system and plays a role during definitive erythropoiesis in the adult. Despite the importance of Tal1 in erythropoiesis, only a small number of erythroid differentiation target genes are known. A chromatin precipitation and cloning approach was established to uncover novel Tal1 target genes in erythropoiesis. The BirA tag/BirA ligase biotinylation system in combination with streptavidin chromatin precipitation (Strep-CP) was used to co-precipitate genomic DNA bound to Tal1. Tal1 was found to bind in the vicinity of 31 genes including the E2-ubiquitin conjugase UBE2H gene. Binding of Tal1 to UBE2H was confirmed by chromatin immunoprecipitation. UBE2H expression is increased during erythroid differentiation of hCD34(+) cells. Tal1 expression activated UBE2H expression, whereas Tal1 knock-down reduced UBE2H expression and ubiquitin transfer activity. This study identifies parts of the ubiquitinylation machinery as a cellular target downstream of the transcription factor Tal1 and provides novel insights into Tal1-regulated erythropoiesis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antigens, CD34
  • Basic Helix-Loop-Helix Transcription Factors / genetics
  • Basic Helix-Loop-Helix Transcription Factors / metabolism*
  • Cell Differentiation / physiology
  • Erythrocytes / metabolism*
  • Erythroid Precursor Cells / metabolism*
  • Erythropoiesis / physiology*
  • Gene Expression Regulation, Enzymologic / physiology*
  • Humans
  • K562 Cells
  • Proto-Oncogene Proteins / genetics
  • Proto-Oncogene Proteins / metabolism*
  • T-Cell Acute Lymphocytic Leukemia Protein 1
  • Ubiquitin / genetics
  • Ubiquitin / metabolism
  • Ubiquitin-Conjugating Enzymes / biosynthesis*
  • Ubiquitin-Conjugating Enzymes / genetics
  • Ubiquitination / physiology

Substances

  • Antigens, CD34
  • Basic Helix-Loop-Helix Transcription Factors
  • Proto-Oncogene Proteins
  • T-Cell Acute Lymphocytic Leukemia Protein 1
  • Ubiquitin
  • TAL1 protein, human
  • UBE2H protein, human
  • Ubiquitin-Conjugating Enzymes