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Mol. Cell. Biol., Jul 1996, 3545-3553, Vol 16, No. 7
J Svaren, BR Sevetson, ED Apel, DB Zimonjic, NC Popescu and J Milbrandt
Previous work had identified a corepressor, NAB1, which represses
transcriptional activation mediated by NGFI-A (also known as Egr-1, zif268,
and Krox24) and Krox20. These zinc finger transcription factors are encoded
by immediate-early genes and have been implicated in a wide variety of
proliferative and differentiative processes. We have isolated and
characterized another corepressor, NAB2, which is highly related to NAB1
within two discrete domains. The first conserved domain of NAB2 mediates an
interaction with the R1 domain of NGFI-A. NAB2 represses the activity of
both NGFI-A and Krox20, and its expression is regulated by some of the same
stimuli that induce NGFI-A expression, including serum stimulation of
fibroblasts and nerve growth factor stimulation of PC12 cells. The human
NAB2 gene has been localized to chromosome 12ql3.3-14.1, a region that is
rearranged in several solid tumors, lipomas, uterine leiomyomata, and
liposarcomas. Sequencing of the Caenorhabditis elegans genome has
identified a gene that bears high homology to both NAB1 and NAB2,
suggesting that NAB molecules fulfill an evolutionarily conserved role.
Copyright © 1996, American Society for Microbiology
NAB2, a corepressor of NGFI-A (Egr-1) and Krox20, is induced by proliferative and differentiative stimuli
Department of Pathology, Washington University School of Medicine, St. Louis, Missouri 63110, USA.
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