| First Author | Agata Y | Year | 1999 |
| Journal | J Biol Chem | Volume | 274 |
| Issue | 23 | Pages | 16412-22 |
| PubMed ID | 10347202 | Mgi Jnum | J:55434 |
| Mgi Id | MGI:1337956 | Doi | 10.1074/jbc.274.23.16412 |
| Citation | Agata Y, et al. (1999) Two novel Kruppel-associated box-containing zinc-finger proteins, KRAZ1 and KRAZ2, repress transcription through functional interaction with the corepressor KAP-1 (TIF1beta/KRIP-1). J Biol Chem 274(23):16412-22 |
| abstractText | We have isolated two novel Kruppel-like zinc finger proteins containing the evolutionarily conserved Kruppel-associated box (KRAB), KRAZ1 and KRAZ2, and demonstrated that they repress transcription when heterologously targeted to DNA. Their repression activity appeared to be mediated by the putative corepressor KAP-1 (KRAB-associated protein-1), because KRAZ1/2 bind to KAP-1, but KRAB mutants of KRAZ1/2 that are unable to interact with KAP-1 lack repression activity, and KAP-1 has intrinsic repressor activity and potentiates KRAZ1/2-mediated repression. We dissected the KAP-1 protein into a KRAB-interacting domain and a region necessary for repression. Using a mammalian two-hybrid assay, we further demonstrated that KAP-1 deletions lacking repression activity fused to the VP16 transactivation domain strongly activated transcription when coexpressed with KRAZ1. In contrast, VP16-KAP-1 fusions retaining repression activity resulted in repression. These results provide the first evidence that KAP-1 functionally interacts with KRAB in mammalian cells and seems to exert repressor activity in the DNA-bound KRAB-KAP-1 complex, and they further support the hypothesis that KAP-1 functions as a corepressor for the large class of KRAB-containing zinc finger proteins. |
