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Mol. Cell. Biol., Aug 1995, 4184-4193, Vol 15, No. 8
K Itoh, K Igarashi, N Hayashi, M Nishizawa and M Yamamoto
The chicken beta-globin enhancer is critical for the tissue- and
developmental stage-specific expression of the beta-globin genes. This
enhancer contains two indispensable cis elements, one containing two GATA
sites and the other containing an NF-E2 site. To identify the putative
transcription factor acting through the NF-E2 motif in the chicken
beta-globin enhancer, we screened chicken cDNA libraries with a mouse p45
NF-E2 cDNA probe and isolated cDNA clones which encode a protein of 582
amino acid residues. This protein contains a region that includes the basic
region-leucine zipper domain which is well conserved among members of the
CNC family proteins (Cap 'n' collar, p45 NF-E2, LCR-F1, Nrf1, and Nrf2).
Hence, we named this protein ECH (erythroid cell-derived protein with CNC
homology). ECH is expressed abundantly in cultured erythroid cells
undergoing terminal differentiation, peripheral erythrocytes, and some
nonhematopoietic tissues. Since most of the cDNA clones obtained from the
chicken erythrocyte cDNA library encoded ECH, ECH is likely the predominant
CNC family protein present in avian peripheral erythrocytes. Like p45
NF-E2, ECH can heterodimerize with any of the small Maf family proteins and
bind the NF-E2 site as a heterodimer in vitro. In a transfection assay, ECH
transactivates transcription depending on the presence of NF-E2 sites on
the reporter gene plasmid. These results indicate that ECH is likely a key
regulator of avian erythropoiesis.
Copyright © 1995, American Society for Microbiology
Cloning and characterization of a novel erythroid cell-derived CNC family transcription factor heterodimerizing with the small Maf family proteins
Department of Biochemistry, Tohoku University School of Medicine, Sendai, Japan.
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