The first crystal structures of hybrid and parallel four-tetrad intramolecular G-quadruplexes
Abstract
Abstract G-quadruplexes (GQs) are non-canonical DNA structures composed of stacks of stabilized G-tetrads. GQs play an important role in a variety of biological processes and may form at telomeres and oncogene promoters among other genomic locations. Here, we investigate nine variants of telomeric DNA from Tetrahymena thermophila with the repeat (TTGGGG)n. Biophysical data indicate that the sequences fold into stable four-tetrad GQs which adopt multiple conformations according to native PAGE. Excitingly, we solved the crystal structure of two variants, TET25 and TET26. The two variants differ by the presence of a 3′-T yet adopt different GQ conformations. TET25 forms a hybrid [3 + 1] GQ and exhibits a rare 5′-top snapback feature. Consequently, TET25 contains four loops: three lateral (TT, TT, and GTT) and one propeller (TT). TET26 folds into a parallel GQ with three TT propeller loops. To the best of our knowledge, TET25 and TET26 are the first reported hybrid and parallel four-tetrad unimolecular GQ structures. The results presented here expand the repertoire of available GQ structures and provide insight into the intricacy and plasticity of the 3D architecture adopted by telomeric repeats from T. thermophila and GQs in general.
- Authors:
-
- Department of Chemistry and Biochemistry, Swarthmore College, 500 College Ave, Swarthmore, PA 19081, USA
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Institutes of Health (NIH)
- OSTI Identifier:
- 1846461
- Alternate Identifier(s):
- OSTI ID: 1863051
- Grant/Contract Number:
- AC02-06CH11357; P30 GM124165; 1R15CA208676-01A1; 1R15CA253134
- Resource Type:
- Published Article
- Journal Name:
- Nucleic Acids Research
- Additional Journal Information:
- Journal Name: Nucleic Acids Research Journal Volume: 50 Journal Issue: 5; Journal ID: ISSN 0305-1048
- Publisher:
- Oxford University Press
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES
Citation Formats
Beseiso, Dana, Chen, Erin V., McCarthy, Sawyer E., Martin, Kailey N., Gallagher, Elizabeth P., Miao, Joanne, and Yatsunyk, Liliya A. The first crystal structures of hybrid and parallel four-tetrad intramolecular G-quadruplexes. United Kingdom: N. p., 2022.
Web. doi:10.1093/nar/gkac091.
Beseiso, Dana, Chen, Erin V., McCarthy, Sawyer E., Martin, Kailey N., Gallagher, Elizabeth P., Miao, Joanne, & Yatsunyk, Liliya A. The first crystal structures of hybrid and parallel four-tetrad intramolecular G-quadruplexes. United Kingdom. https://doi.org/10.1093/nar/gkac091
Beseiso, Dana, Chen, Erin V., McCarthy, Sawyer E., Martin, Kailey N., Gallagher, Elizabeth P., Miao, Joanne, and Yatsunyk, Liliya A. Fri .
"The first crystal structures of hybrid and parallel four-tetrad intramolecular G-quadruplexes". United Kingdom. https://doi.org/10.1093/nar/gkac091.
@article{osti_1846461,
title = {The first crystal structures of hybrid and parallel four-tetrad intramolecular G-quadruplexes},
author = {Beseiso, Dana and Chen, Erin V. and McCarthy, Sawyer E. and Martin, Kailey N. and Gallagher, Elizabeth P. and Miao, Joanne and Yatsunyk, Liliya A.},
abstractNote = {Abstract G-quadruplexes (GQs) are non-canonical DNA structures composed of stacks of stabilized G-tetrads. GQs play an important role in a variety of biological processes and may form at telomeres and oncogene promoters among other genomic locations. Here, we investigate nine variants of telomeric DNA from Tetrahymena thermophila with the repeat (TTGGGG)n. Biophysical data indicate that the sequences fold into stable four-tetrad GQs which adopt multiple conformations according to native PAGE. Excitingly, we solved the crystal structure of two variants, TET25 and TET26. The two variants differ by the presence of a 3′-T yet adopt different GQ conformations. TET25 forms a hybrid [3 + 1] GQ and exhibits a rare 5′-top snapback feature. Consequently, TET25 contains four loops: three lateral (TT, TT, and GTT) and one propeller (TT). TET26 folds into a parallel GQ with three TT propeller loops. To the best of our knowledge, TET25 and TET26 are the first reported hybrid and parallel four-tetrad unimolecular GQ structures. The results presented here expand the repertoire of available GQ structures and provide insight into the intricacy and plasticity of the 3D architecture adopted by telomeric repeats from T. thermophila and GQs in general.},
doi = {10.1093/nar/gkac091},
journal = {Nucleic Acids Research},
number = 5,
volume = 50,
place = {United Kingdom},
year = {Fri Feb 25 00:00:00 EST 2022},
month = {Fri Feb 25 00:00:00 EST 2022}
}
https://doi.org/10.1093/nar/gkac091
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