Cited by 323Genomics and Chromatin DynamicsEpigenetics and DNA MethylationChromatin Remodeling and Cancer

The KAP1 Corepressor Functions To Coordinate the Assembly of De Novo HP1-Demarcated Microenvironments of Heterochromatin Required for KRAB Zinc Finger Protein-Mediated Transcriptional Repression

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Sripathy, Smitha P., Stevens, Jessica, Schultz, David C.·2006·Molecular and Cellular Biology

Abstract

KAP1/TIF1beta is proposed to be a universal corepressor protein for the KRAB zinc finger protein (KRAB-zfp) superfamily of transcriptional repressors. To characterize the role of KAP1 and KAP1-interacting proteins in transcriptional repression, we investigated the regulation of stably integrated reporter transgenes by hormone-responsive KRAB and KAP1 repressor proteins. Here, we demonstrate that depletion of endogenous KAP1 levels by small interfering RNA (siRNA) significantly inhibited KRAB-mediated transcriptional repression of a chromatin template. Similarly, reduction in cellular levels of HP1alpha/beta/gamma and SETDB1 by siRNA attenuated KRAB-KAP1 repression. We also found that direct tethering of KAP1 to DNA was sufficient to repress transcription of an integrated transgene. This activity is absolutely dependent upon the interaction of KAP1 with HP1 and on an intact PHD finger and bromodomain of KAP1, suggesting that these domains function cooperatively in transcriptional corepression. The achievement of the repressed state by wild-type KAP1 involves decreased recruitment of RNA polymerase II, reduced levels of histone H3 K9 acetylation and H3K4 methylation, an increase in histone occupancy, enrichment of trimethyl histone H3K9, H3K36, and histone H4K20, and HP1 deposition at proximal regulatory sequences of the transgene. A KAP1 protein containing a mutation of the HP1 binding domain failed to induce any change in the histone modifications associated with DNA sequence…

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Crossref · 10.1128/mcb.00487-06

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Authors
Sripathy, S. P., Stevens, J., & Schultz, D. C.
Affiliations
Case Comprehensive Cancer Center (US)
Venue
Molecular and Cellular Biology
Published
2006-11-01
Volume
26
Issue
22
Pages
8623-8638
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2105073128
Cited by
323
References
70
Citations by year
2026: 9 · 2025: 10 · 2024: 20 · 2023: 15 · 2022: 14 · 2021: 21 · 2020: 24 · 2019: 14 · 2018: 14 · 2017: 14 · 2016: 15 · 2015: 19 · 2014: 13 · 2013: 12 · 2012: 20
FWCI
6.11
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Case Comprehensive Cancer Center, Case Western Reserve University
  • National Cancer Institute (K01CA099093, CA-99093)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Chromatin Remodeling and Cancer
Keywords
KRAB zinc finger proteins, transcriptional repression, heterochromatin, HP1 proteins, SETDB1, PHD finger, bromodomain, histone modifications, H3K9 trimethylation, H3K4 methylation, nuclear compartmentalization, chromatin templates, RNA polymerase II recruitment
MeSH terms
Tripartite Motif-Containing Protein 28, Chromobox Protein Homolog 5, Cell Line, Chromatin, DNA-Binding Proteins, Heterochromatin, Histones, Hormones, Humans, Histone-Lysine N-Methyltransferase, Protein Methyltransferases, Repressor Proteins, RNA Polymerase II, Transcription Factors, Transcription, Genetic, Transfection, Genes, Reporter, Integrases, Saccharomyces cerevisiae Proteins, RNA, Small Interfering

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