Abstract：
:BTB-zinc finger transcription factors play many important roles in metazoan development. In these proteins, the BTB domain is critical for dimerization and for recruiting cofactors to target genes. Identification of these cofactors is important for understanding how BTB-zinc finger proteins influence transcription. Here we show that the novel but conserved protein EOR-2 is an obligate binding partner of the BTB-zinc finger protein EOR-1 in Caenorhabditis elegans. EOR-1 and EOR-2 function together to promote multiple Ras/ERK-dependent cell fates during development, and we show that EOR-1 is a robust substrate of ERK in vitro. A point mutation (L81F) in the EOR-1 BTB domain reduces both ERK phosphorylation and EOR-2 binding and eliminates all detectable biological function without affecting EOR-1 expression levels, localization, or dimerization. This point mutation lies near the predicted charged pocket region of the EOR-1 BTB dimer, a region that, in other BTB-zinc finger proteins, has been proposed to interact with corepressors or coactivators. We also show that a conserved zinc finger-like motif in EOR-2 is required for binding to EOR-1, that the interaction between EOR-1 and EOR-2 is direct, and that EOR-2 can bind to the human BTB-zinc finger protein PLZF. We propose that EOR-2 defines a new family of cofactors for BTB-zinc finger transcription factors that may have conserved roles in other organisms.
journal_name
Geneticsjournal_title
Geneticsauthors
Howell K,Arur S,Schedl T,Sundaram MVdoi
10.1534/genetics.109.111591subject
Has Abstractpub_date
2010-04-01 00:00:00pages
899-913issue
4eissn
0016-6731issn
1943-2631pii
genetics.109.111591journal_volume
184pub_type
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