Cir_N

N-terminal domain of CBF1 interacting co-repressor CIR
Cir_N
SMART accession number:SM01083
Description: This is a 45 residue conserved region at the N-terminal end of a family of proteins referred to as CIRs (CBF1-interacting co-repressors). CBF1 (centromere-binding factor 1) acts as a transcription factor that causes repression by binding specifically to GTGGGAA motifs in responsive promoters, and it requires CIR as a co-repressor. CIR binds to histone deacetylase and to SAP30 and serves as a linker between CBF1 and the histone deacetylase complex (PUBMED:9874765).
Interpro abstract (IPR019339):

This entry represents a 45 residue conserved domain found at the N-terminal end CIR protein (CBF1-interacting co-repressor, also known as corepressor interacting with RBPJ 1). This domain can be found in the fungal CWC25 family members and mammlian LENG1 (leukocyte receptor cluster member 1) protein.

CBF1 (centromere-binding factor 1) acts as a transcription factor that causes repression by binding specifically to GTGGGAA motifs in responsive promoters, and it requires CIR as a co-repressor. CIR binds to histone deacetylase and to SAP30 and serves as a linker between CBF1 and the histone deacetylase complex [(PUBMED:9874765)]. CIR also plays a role in alternative splicing [(PUBMED:15652350)].

Budding yeast Cwc25 is a pre-mRNA-splicing factor involved in pre-mRNA splicing [(PUBMED:14690591)].

Family alignment:
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There are 2628 Cir_N domains in 2626 proteins in SMART's nrdb database.

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