Detailed DSSR results for the G-quadruplex: PDB entry 5z80
Created and maintained by Xiang-Jun Lu <xiangjun@x3dna.org>
Citation: Please cite the NAR'20 DSSR-PyMOL schematics paper and/or the NAR'15 DSSR method paper.
Summary information
- PDB id
- 5z80
- Class
- DNA
- Method
- NMR
- Summary
- Solution structure for the 1:1 complex of a platinum(ii)-based tripod bound to a hybrid-1 human telomeric g-quadruplex
- Reference
- Liu W, Zhong YF, Liu LY, Shen CT, Zeng W, Wang F, Yang D, Mao ZW (2018): "Solution structures of multiple G-quadruplex complexes induced by a platinum(II)-based tripod reveal dynamic binding." Nat Commun, 9, 3496. doi: 10.1038/s41467-018-05810-4.
- Abstract
- DNA G-quadruplexes are not only attractive drug targets for cancer therapeutics, but also have important applications in supramolecular assembly. Here, we report a platinum(II)-based tripod (Pt-tripod) specifically binds the biological relevant hybrid-1 human telomeric G-quadruplex (Tel26), and strongly inhibits telomerase activity. Further investigations illustrate Pt-tripod induces the formation of monomeric and multimeric Pt-tripod‒Tel26 complex structures in solution. We solve the 1:1 and the unique dimeric 4:2 Pt-tripod-Tel26 complex structures by NMR. The structures indicate preferential binding of Pt-tripod to the 5'-end of Tel26 at a low Pt-tripod/Tel26 ratio of 0-1.0. After adding more Pt-tripod, the Pt-tripod binds the 3'-end of Tel26, unexpectedly inducing a unique dimeric 4:2 structure interlocked by an A:A non-canonical pair at the 3'-end. Our structures provide a structural basis for understanding the dynamic binding of small molecules with G-quadruplex and DNA damage mechanisms, and insights into the recognition and assembly of higher-order G-quadruplexes.
- G4 notes
- 3 G-tetrads, 1 G4 helix, 1 G4 stem, 3(-P-Lw-Ln), hybrid-1(3+1), UUDU
Base-block schematics in six views
List of 3 G-tetrads
1 glyco-bond=-s-s sugar=--.- groove=wnwn planarity=0.357 type=other nts=4 GGGG A.DG4,A.DG22,A.DG18,A.DG10 2 glyco-bond=--s- sugar=-.-- groove=-wn- planarity=0.255 type=other nts=4 GGGG A.DG5,A.DG11,A.DG17,A.DG23 3 glyco-bond=--s- sugar=-.-3 groove=-wn- planarity=0.250 type=other nts=4 GGGG A.DG6,A.DG12,A.DG16,A.DG24
List of 1 G4-helix
In DSSR, a G4-helix is defined by stacking interactions of G-tetrads, regardless of backbone connectivity, and may contain more than one G4-stem.
Helix#1, 3 G-tetrad layers, INTRA-molecular, with 1 stem
 |
1 glyco-bond=-s-s sugar=--.- groove=wnwn WC-->Major nts=4 GGGG A.DG4,A.DG22,A.DG18,A.DG10 2 glyco-bond=--s- sugar=---. groove=-nw- Major-->WC nts=4 GGGG A.DG5,A.DG23,A.DG17,A.DG11 3 glyco-bond=--s- sugar=-3-. groove=-nw- Major-->WC nts=4 GGGG A.DG6,A.DG24,A.DG16,A.DG12 step#1 mm(<>,outward) area=12.33 rise=3.69 twist=21.8 step#2 pm(>>,forward) area=13.21 rise=3.58 twist=28.2 strand#1 DNA glyco-bond=--- sugar=--- nts=3 GGG A.DG4,A.DG5,A.DG6 strand#2 DNA glyco-bond=s-- sugar=--3 nts=3 GGG A.DG22,A.DG23,A.DG24 strand#3 DNA glyco-bond=-ss sugar=.-- nts=3 GGG A.DG18,A.DG17,A.DG16 strand#4 DNA glyco-bond=s-- sugar=-.. nts=3 GGG A.DG10,A.DG11,A.DG12 |
| 2 stacking diagrams | |
 |
1 glyco-bond=-s-s sugar=--.- groove=wnwn WC-->Major nts=4 GGGG A.DG4,A.DG22,A.DG18,A.DG10 |
 |
2 glyco-bond=--s- sugar=---. groove=-nw- Major-->WC nts=4 GGGG A.DG5,A.DG23,A.DG17,A.DG11 |
List of 1 G4-stem
In DSSR, a G4-stem is defined as a G4-helix with backbone connectivity. Bulges are also allowed along each of the four strands.
Stem#1, 3 G-tetrad layers, 3 loops, INTRA-molecular, UUDU, hybrid-(mixed), 3(-P-Lw-Ln), hybrid-1(3+1)
 |
1 glyco-bond=-s-s sugar=--.- groove=nwnw Major-->WC nts=4 GGGG A.DG4,A.DG10,A.DG18,A.DG22 2 glyco-bond=--s- sugar=-.-- groove=-wn- WC-->Major nts=4 GGGG A.DG5,A.DG11,A.DG17,A.DG23 3 glyco-bond=--s- sugar=-.-3 groove=-wn- WC-->Major nts=4 GGGG A.DG6,A.DG12,A.DG16,A.DG24 step#1 mm(<>,outward) area=12.33 rise=3.69 twist=21.8 step#2 pm(>>,forward) area=13.21 rise=3.58 twist=28.2 strand#1 U DNA glyco-bond=--- sugar=--- nts=3 GGG A.DG4,A.DG5,A.DG6 strand#2 U DNA glyco-bond=s-- sugar=-.. nts=3 GGG A.DG10,A.DG11,A.DG12 strand#3 D DNA glyco-bond=-ss sugar=.-- nts=3 GGG A.DG18,A.DG17,A.DG16 strand#4 U DNA glyco-bond=s-- sugar=--3 nts=3 GGG A.DG22,A.DG23,A.DG24 loop#1 type=propeller strands=[#1,#2] nts=3 TTA A.DT7,A.DT8,A.DA9 loop#2 type=lateral strands=[#2,#3] nts=3 TTA A.DT13,A.DT14,A.DA15 loop#3 type=lateral strands=[#3,#4] nts=3 TTA A.DT19,A.DT20,A.DA21 |