CTBP1

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Protein-coding gene in the species Homo sapiens

title: "CTBP1" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["transcription-coregulators"] description: "Protein-coding gene in the species Homo sapiens" topic_path: "general/transcription-coregulators" source: "https://en.wikipedia.org/wiki/CTBP1" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0

::summary Protein-coding gene in the species Homo sapiens ::

C-terminal-binding protein 1 also known as CtBP1 is a protein that in humans is encoded by the CTBP1 gene. CtBP1 is one of two CtBP proteins, the other protein being CtBP2.

Function

The CtBP1 protein was originally identified as a human protein that bound a PLDLS motif in the C-terminus of adenovirus E1A proteins. It and the related protein CTBP2 were later shown to function as transcriptional corepressors. That is, regulatory proteins that bind to sequence-specific DNA-binding proteins and help turn genes off. CtBPs do this by recruiting histone modifying enzymes that add repressive histone marks and remove activating marks. CtBP proteins can also self-associate and presumably bring together gene regulatory complexes.

CtBP1 is broadly expressed from embryo to adult, while CtBP2 has a somewhat more restricted pattern of expression. CtBPs have multiple biological roles and appear to be most important in regulating the epithelial to mesenchymal transition, as well as influencing metabolism. They do the latter by binding NADH in preference to NAD+, thereby sensing the NADH/NAD+ ratio. When bound, it undergoes a conformational change that allows it to dimerize and associate with its partner proteins and silence specific genes.

During skeletal and T cell development, CtBP1 and CtBP2 associate with the PLDLSL domain of δEF1, a cellular zinc finger-homeodomain protein, and thereby enhances δEF1-induced transcriptional silencing. CtBP also binds the Kruppel-like factors family of zinc finger proteins KLF3, KLF8 and KLF12. In addition, CtBP complexes with CtIP, a 125 kDa protein that recognizes distinctly different protein motifs from CtBP. CtIP binds to the BRCT repeats within the breast cancer gene BRCA1 and enables CtBP to influence BRCA1 activity. Both proteins can also interact with a polycomb group protein complex which participates in regulation of gene expression during development. Alternative splicing of transcripts from this gene results in multiple transcript variants.

C-terminal-binding protein interacting protein (CtIP) is a binding partner with CtBP, which contribute to transcription repression and cell cycle regulation, and which have a role in the cellular response to DNA damage.

Interactions

CTBP1 has been shown to interact with:

References

References

  1. (April 1998). "Interaction between a cellular protein that binds to the C-terminal region of adenovirus E1A (CtBP) and a novel cellular protein is disrupted by E1A through a conserved PLDLS motif". J. Biol. Chem..
  2. (2020). "CtBP determines ovarian cancer cell fate through repression of death receptors". [[List of Nature Research journals#C.
  3. (September 1998). "Cloning and characterization of mCtBP2, a co-repressor that associates with basic Krüppel-like factor and other mammalian transcriptional regulators". EMBO J..
  4. Chinnadurai G. (2002). "CtBP, an unconventional transcriptional corepressor in development and oncogenesis". Mol. Cell.
  5. "Entrez Gene: CTBP1 C-terminal binding protein 1".
  6. (2007). "C-terminal-binding protein interacting protein binds directly to adenovirus early region 1A through its N-terminal region and conserved region 3". [[Oncogene (journal).
  7. (February 2003). "The brain-specific actin-related protein ArpN alpha interacts with the transcriptional co-repressor CtBP". Biochem. Biophys. Res. Commun..
  8. (March 2006). "Targeting of C-Terminal Binding Protein (CtBP) by ARF Results in p53-Independent Apoptosis". Mol. Cell. Biol..
  9. (November 2001). "Interaction of EVI1 with cAMP-responsive element-binding protein-binding protein (CBP) and p300/CBP-associated factor (P/CAF) results in reversible acetylation of EVI1 and in co-localization in nuclear speckles". J. Biol. Chem..
  10. (May 2001). "The corepressor CtBP interacts with Evi-1 to repress transforming growth factor beta signaling". Blood.
  11. (January 2004). "Transcriptional and DNA Binding Activity of the Foxp1/2/4 Family Is Modulated by Heterotypic and Homotypic Protein Interactions". Mol. Cell. Biol..
  12. (January 2001). "Association of COOH-terminal-binding protein (CtBP) and MEF2-interacting transcription repressor (MITR) contributes to transcriptional repression of the MEF2 transcription factor". J. Biol. Chem..
  13. (December 2000). "The interaction of the carboxyl terminus-binding protein with the Smad corepressor TGIF is disrupted by a holoprosencephaly mutation in TGIF". J. Biol. Chem..
  14. (June 1998). "The carboxy-terminal region of adenovirus E1A activates transcription through targeting of a C-terminal binding protein-histone deacetylase complex". FEBS Lett..
  15. (June 2000). "Ikaros interactions with CtBP reveal a repression mechanism that is independent of histone deacetylase activity". J. Biol. Chem..
  16. (December 2002). "The Ikaros family protein Eos associates with C-terminal-binding protein corepressors". Eur. J. Biochem..
  17. (May 2000). "Human Krüppel-like factor 8: a CACCC-box binding protein that associates with CtBP and represses transcription". Nucleic Acids Res..
  18. (July 2003). "Hdm2 recruits a hypoxia-sensitive corepressor to negatively regulate p53-dependent transcription". Curr. Biol..
  19. (July 2003). "MLL repression domain interacts with histone deacetylases, the polycomb group proteins HPC2 and BMI-1, and the corepressor C-terminal-binding protein". Proc. Natl. Acad. Sci. U.S.A..
  20. (2004). "Multiple domains of the Receptor-Interacting Protein 140 contribute to transcription inhibition". Nucleic Acids Res..
  21. (March 2008). "TBL1 and TBLR1 Phosphorylation on Regulated Gene Promoters Overcomes Dual CtBP and NCoR/SMRT Transcriptional Repression Checkpoints". Mol. Cell.
  22. (December 2004). "Nuclear Speckle-Associated Protein Pnn/DRS Binds to the Transcriptional Corepressor CtBP and Relieves CtBP- Mediated Repression of the E-Cadherin Gene". Mol. Cell. Biol..
  23. (April 1999). "Binding of CtIP to the BRCT repeats of BRCA1 involved in the transcription regulation of p21 is disrupted upon DNA damage". J. Biol. Chem..
  24. (September 2010). "Sumoylation regulates interaction of FOG1 with C-terminal-binding protein (CTBP)". The Journal of Biological Chemistry.
  25. (April 2017). "The GATA factor revolution in hematology". Blood.

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transcription-coregulators