6TL1 | pdb_00006tl1

Crystal structure of the TASOR pseudo-PARP domain

• PDB DOI: https://doi.org/10.2210/pdb6TL1/pdb

• Classification: GENE REGULATION
• Organism(s): Homo sapiens
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2019-11-29 Released: 2020-09-16 
• Deposition Author(s): Douse, C.H., Timms, R.T., Freund, S.M.V., Modis, Y.
• Funding Organization(s): Wellcome Trust, Biotechnology and Biological Sciences Research Council

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.03 Å
• R-Value Free: 
  0.229 (Depositor), 0.235 (DCC) 
• R-Value Work: 
  0.195 (Depositor), 0.200 (DCC) 
• R-Value Observed: 
  0.197 (Depositor) 

Literature

TASOR is a pseudo-PARP that directs HUSH complex assembly and epigenetic transposon control.

Douse, C.H., Tchasovnikarova, I.A., Timms, R.T., Protasio, A.V., Seczynska, M., Prigozhin, D.M., Albecka, A., Wagstaff, J., Williamson, J.C., Freund, S.M.V., Lehner, P.J., Modis, Y.

(2020) Nat Commun 11: 4940-4940

• PubMed: 33009411 
• DOI: https://doi.org/10.1038/s41467-020-18761-6
• Primary Citation Related Structures: 
  6TL1


• PubMed Abstract: 
  

  The HUSH complex represses retroviruses, transposons and genes to maintain the integrity of vertebrate genomes. HUSH regulates deposition of the epigenetic mark H3K9me3, but how its three core subunits - TASOR, MPP8 and Periphilin - contribute to assembly and targeting of the complex remains unknown. Here, we define the biochemical basis of HUSH assembly and find that its modular architecture resembles the yeast RNA-induced transcriptional silencing complex. TASOR, the central HUSH subunit, associates with RNA processing components. TASOR is required for H3K9me3 deposition over LINE-1 repeats and repetitive exons in transcribed genes. In the context of previous studies, this suggests that an RNA intermediate is important for HUSH activity. We dissect the TASOR and MPP8 domains necessary for transgene repression. Structure-function analyses reveal TASOR bears a catalytically-inactive PARP domain necessary for targeted H3K9me3 deposition. We conclude that TASOR is a multifunctional pseudo-PARP that directs HUSH assembly and epigenetic regulation of repetitive genomic targets.

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Organizational Affiliation: 
• Molecular Immunity Unit, Department of Medicine, University of Cambridge, MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge, CB2 0QH, UK.
Department of Experimental Medical Science, Lund University, Lund, Sweden.
Cambridge Institute of Therapeutic Immunology & Infectious Disease (CITIID), University of Cambridge School of Clinical Medicine, Cambridge, CB2 0AW, UK.
The Gurdon Institute, Cambridge, UK.
Department of Pathology, University of Cambridge, Cambridge, UK.
Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA.
MRC Laboratory of Molecular Biology, Cambridge, UK.
Structural Studies Division, MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge, CB2 0QH, UK.
Cambridge Institute of Therapeutic Immunology & Infectious Disease (CITIID), University of Cambridge School of Clinical Medicine, Cambridge, CB2 0AW, UK. [e-mail].
Molecular Immunity Unit, Department of Medicine, University of Cambridge, MRC Laboratory of Molecular Biology, Cambridge Biomedical Campus, Cambridge, CB2 0QH, UK. [e-mail].
Cambridge Institute of Therapeutic Immunology & Infectious Disease (CITIID), University of Cambridge School of Clinical Medicine, Cambridge, CB2 0AW, UK. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Biological Assembly Evidence: gel filtration, assay for oligomerization

Biological Assembly 2  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 2 assigned by authors.

Macromolecule Content 

• Total Structure Weight: 49.74 kDa 
• Atom Count: 3,505 
• Modeled Residue Count: 412 
• Deposited Residue Count: 428 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Protein TASOR	A, B	214	Homo sapiens	Mutation(s): 0  Gene Names: TASOR, C3orf63, FAM208A, KIAA1105
UniProt & NIH Common Fund Data Resources
Find proteins for Q9UK61 (Homo sapiens) Explore Q9UK61  Go to UniProtKB:  Q9UK61
PHAROS:  Q9UK61 GTEx:  ENSG00000163946

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	C [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.03 Å
• R-Value Free:  0.229 (Depositor), 0.235 (DCC) 
• R-Value Work:  0.195 (Depositor), 0.200 (DCC) 
• R-Value Observed: 0.197 (Depositor) 

Diffraction Data: https://doi.org/10.15785/SBGRID/742

Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 74.59	α = 90
b = 74.59	β = 90
c = 184.04	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
Aimless	data scaling
AutoSol	phasing
PDB_EXTRACT	data extraction

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2020-09-16 
Deposition Author(s): Douse, C.H., Timms, R.T., Freund, S.M.V., Modis, Y.

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Funding Organization	Location	Grant Number
Wellcome Trust	United Kingdom	101908/Z/13/Z
Wellcome Trust	United Kingdom	217191/Z/19/Z
Biotechnology and Biological Sciences Research Council	United Kingdom	BB/N011791/1

Revision History  

• Version 1.0: 2020-09-16
  Type: Initial release
  
• Version 1.1: 2020-10-14
  Changes: Database references
• Version 1.2: 2024-05-15
  Changes: Data collection, Database references