ATF7IP is a multifunctional nuclear protein that associates with heterochromatin. It can act as a transcriptional coactivator or corepressor depending upon its binding partners (summary by Liu et al., 2009 [PubMed 19106100]).[supplied by OMIM, Nov 2010]
Function:
Recruiter that couples transcriptional factors to general transcription apparatus and thereby modulates transcription regulation and chromatin formation. Can both act as an activator or a repressor depending on the context. Mediates MBD1-dependent transcriptional repression, probably by recruiting complexes containing SETDB1. Required to stimulate histone methyltransferase activity of SETDB1 and facilitate the conversion of dimethylated to trimethylated H3 'Lys-9' (H3K9me3). The complex formed with MBD1 and SETDB1 represses transcription and couples DNA methylation and histone H3 'Lys-9' trimethylation (H3K9me3). Facilitates telomerase TERT and TERC gene expression by SP1 in cancer cells.
Subunit:
Interacts with MBD1; the interaction is enhanced when MBD1 is sumoylated. Probably forms a complex with SETDB1 and MBD1. Interacts with SUMO ubiquitin-like proteins (SUMO1, SUNO2 and SUMO3), with a preference for SUMO2 and SUMO3. Interacts with SP1, ATF7 and ZHX1. Interacts with the general transcription machinery, including ERCC2, ERCC3, GTF2E1, GTF2E2 and POLR2A. Interacts with Epstein-Barr virus BRLF1/Rta protein, leading to promote and regulate host genes in Epstein-Barr virus-infected cells.
Subcellular Location:
Nucleus
Tissue Specificity:
Detected at low levels in breast, lung and stomach; highly up-regulated in the corresponding cancerous tissues (at protein level).
Similarity:
Belongs to the MCAF family.
Contains 1 fibronectin type-III domain.
SWISS:
Q6VMQ6
Gene ID:
55729
Database links:
Entrez Gene: 55729 Human
Entrez Gene: 54343 Mouse
SwissProt: Q6VMQ6 Human
SwissProt: Q7TT18 Mouse
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