7D12

NMR solution structures of CAG RNA-DB213 binding complex

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 5 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation   3D Report Full Report


This is version 1.0 of the entry. See complete history. 


Literature

CAG RNAs induce DNA damage and apoptosis by silencing NUDT16 expression in polyglutamine degeneration.

Peng, S., Guo, P., Lin, X., An, Y., Sze, K.H., Lau, M.H.Y., Chen, Z.S., Wang, Q., Li, W., Sun, J.K., Ma, S.Y., Chan, T.F., Lau, K.F., Ngo, J.C.K., Kwan, K.M., Wong, C.H., Lam, S.L., Zimmerman, S.C., Tuccinardi, T., Zuo, Z., Au-Yeung, H.Y., Chow, H.M., Chan, H.Y.E.

(2021) Proc Natl Acad Sci U S A 118

  • DOI: 10.1073/pnas.2022940118
  • Primary Citation of Related Structures:  
    7D12

  • PubMed Abstract: 

    • DNA damage plays a central role in the cellular pathogenesis of polyglutamine (polyQ) diseases, including Huntington's disease (HD). In this study, we showed that the expression of untranslatable expanded CAG RNA per se induced the cellular DNA damage response pathway ...

    DNA damage plays a central role in the cellular pathogenesis of polyglutamine (polyQ) diseases, including Huntington's disease (HD). In this study, we showed that the expression of untranslatable expanded CAG RNA per se induced the cellular DNA damage response pathway. By means of RNA sequencing (RNA-seq), we found that expression of the Nudix hydrolase 16 ( NUDT16 ) gene was down-regulated in mutant CAG RNA-expressing cells. The loss of NUDT16 function results in a misincorporation of damaging nucleotides into DNAs and leads to DNA damage. We showed that small CAG (sCAG) RNAs, species generated from expanded CAG transcripts, hybridize with CUG-containing NUDT16 mRNA and form a CAG-CUG RNA heteroduplex, resulting in gene silencing of NUDT16 and leading to the DNA damage and cellular apoptosis. These results were further validated using expanded CAG RNA-expressing mouse primary neurons and in vivo R6/2 HD transgenic mice. Moreover, we identified a bisamidinium compound, DB213, that interacts specifically with the major groove of the CAG RNA homoduplex and disfavors the CAG-CUG heteroduplex formation. This action subsequently mitigated RNA-induced silencing complex (RISC)-dependent NUDT16 silencing in both in vitro cell and in vivo mouse disease models. After DB213 treatment, DNA damage, apoptosis, and locomotor defects were rescued in HD mice. This work establishes NUDT16 deficiency by CAG repeat RNAs as a pathogenic mechanism of polyQ diseases and as a potential therapeutic direction for HD and other polyQ diseases.

    Organizational Affiliation: 

    Nexus of Rare Neurodegenerative Diseases, School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China.



Macromolecules

Find similar nucleic acids by:  Sequence   |   3D Structure  

Entity ID: 1
MoleculeChainsLengthOrganismImage
RNA (5'-R(*GP*CP*AP*GP*CP*AP*GP*CP*UP*UP*CP*GP*GP*CP*AP*GP*CP*AP*GP*C)-3')A 20Homo sapiens
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
L94 (Subject of Investigation/LOI)
Query on L94
Download Ideal Coordinates CCD File 
B [auth A]N'-{(Z)-amino[4-(amino{[3-(dimethylammonio)propyl]iminio}methyl)phenyl]methylidene}-N,N-dimethylpropane-1,3-diaminium
C18 H36 N6
QAWYYAYHHZQCLB-UHFFFAOYSA-R		 Ligand Interaction
NA
Query on NA
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
C [auth A],
D [auth A],
E [auth A],
F [auth A],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A]
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 5 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 7D12 Olderado

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

  • Deposited Date: 2020-09-12 
  • Released Date: 2021-05-12 
    • Deposition Author(s): Chan, H.Y.E., Guo, P.

Revision History  (Full details and data files)

  • Version 1.0: 2021-05-12
    Type: Initial release