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CSL-Associated Corepressor and Coactivator Complexes

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Molecular Mechanisms of Notch Signaling

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 1066))

Abstract

The highly conserved Notch signal transduction pathway orchestrates fundamental cellular processes including, differentiation, proliferation, and apoptosis during embryonic development and in the adult organism. Dysregulated Notch signaling underlies the etiology of a variety of human diseases, such as certain types of cancers, developmental disorders and cardiovascular disease. Ligand binding induces proteolytic cleavage of the Notch receptor and nuclear translocation of the Notch intracellular domain (NICD), which forms a ternary complex with the transcription factor CSL and the coactivator MAML to upregulate transcription of Notch target genes. The DNA-binding protein CSL is the centrepiece of transcriptional regulation in the Notch pathway, acting as a molecular hub for interactions with either corepressors or coactivators to repress or activate, respectively, transcription. Here we review previous structure-function studies of CSL-associated coregulator complexes and discuss the molecular insights gleaned from this research. We discuss the functional consequences of both activating and repressing binding partners using the same interaction platforms on CSL. We also emphasize that although there has been a significant uptick in structural information over the past decade, it is still under debate how the molecular switch from repression to activation mediated by CSL occurs at Notch target genes and whether it will be possible to manipulate these transcription complexes therapeutically in the future.

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Abbreviations

CBF1:

C-promoter Binding Factor 1

LAG-1:

abnormal cell LINeage-12 (Lin-12) And abnormal Germ line proliferation phenotype-1 (Glp-1)

RBP-J:

Recombination Signal-Binding Protein for immunoglobin kappa J region

Su(H):

Suppressor of Hairless

CBP/CREBBP:

C-Adenosine Mono Phosphate Responsive Element (cAMP-RE)-Binding protein (CREB)-Binding Protein; KAT3A

EP300:

E1A Binding Protein P300, KAT3B

PCAF:

P300/CBP-Associated Factor; KAT2B

GCN5:

General Control Of AmiNo Acid Synthesis Protein 5-Like 2; KAT2A

CDK8:

Cyclin-Dependent Kinase 8

SCF:

S-Phase Kinase Associated Protein1/Cullin/F-Box Protein

SEL10:

Suppressor and/or Enhancer of abnormal cell LINeage-12 (Lin-12)-10

FBWX7:

F-Box and WD Repeat Domain containing 7

SIRT-1:

Sirtuin-1

CARM1:

Coactivator-Associated Arginine Methyltransferase1

PRMT4:

Protein Arginine N-MethylTransferase 4

CTBP:

C-Terminal Binding Protein

CTIP:

CTBP Interacting Protein

KYOT2/FHL1:

Four and a Half LIM domains 1

NCoR:

Nuclear Receptor CoRepressor

SMRT:

Silencing Mediator For Retinoid And Thyroid Hormone Receptors

SHARP:

SMRT/HDAC1-Associated Repressor Protein

SPEN:

SPlit ENds family transcriptional repressor

LID:

Little Imaginal Disks

KDM5A:

Lysine(K) Demethylase 5A

CIR:

Corepressor Interacting with RBPJ

SKIP:

Sloan-KetterIng-retroviral oncogene (SKI) -Interacting Protein

L3MBTL3:

Lethal(3)Malignant Brain Tumor-Like Protein 3

RITA1:

RBPJ Interacting and Tubulin Associated 1

EBNA2:

Epstein-Barr Virus Nuclear Antigen 2

NFAT:

Nuclear Factor of Activated T-cells

NF-κB1:

Nuclear Factor κB1

POFUT1:

Protein O-Fucosyltransferase 1

Fringe:

Beta-1,3-N-Acetylglucosaminyltransferase

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Acknowledgments

We want to thank Bernd Baumann for critical reading of the manuscript. Research in the F.O. laboratory is supported by the DFG (SFB1074/A3) and the BMBF (Federal Ministry of Education and Research, research nucleus SyStAR). Research in the R.A.K. laboratory is supported by the NIH (CA178974), NSF (MCB-1715822), and the Bankhead-Coley Cancer Research Program.

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Correspondence to Franz Oswald or Rhett A. Kovall .

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Oswald, F., Kovall, R.A. (2018). CSL-Associated Corepressor and Coactivator Complexes. In: Borggrefe, T., Giaimo, B. (eds) Molecular Mechanisms of Notch Signaling. Advances in Experimental Medicine and Biology, vol 1066. Springer, Cham. https://doi.org/10.1007/978-3-319-89512-3_14

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