Summary information [schematics · tetrads · helices · stems · costacks · homepage]

PDB-id
6qjo
Class
DNA
Method
X-ray (1.8 Å)
Summary
DNA containing both right- and left-handed parallel-stranded G-quadruplexes
Reference
Winnerdy, F.R., Bakalar, B., Maity, A., Vandana, J.J., Mechulam, Y., Schmitt, E., Phan, A.T.: (2019) "NMR solution and X-ray crystal structures of a DNA molecule containing both right- and left-handed parallel-stranded G-quadruplexes." Nucleic Acids Res., 47, 8272-8281.
Abstract
Analogous to the B- and Z-DNA structures in double-helix DNA, there exist both right- and left-handed quadruple-helix (G-quadruplex) DNA. Numerous conformations of right-handed and a few left-handed G-quadruplexes were previously observed, yet they were always identified separately. Here, we present the NMR solution and X-ray crystal structures of a right- and left-handed hybrid G-quadruplex. The structure reveals a stacking interaction between two G-quadruplex blocks with different helical orientations and displays features of both right- and left-handed G-quadruplexes. An analysis of loop mutations suggests that single-nucleotide loops are preferred or even required for the left-handed G-quadruplex formation. The discovery of a right- and left-handed hybrid G-quadruplex further expands the polymorphism of G-quadruplexes and is potentially useful in designing a left-to-right junction in G-quadruplex engineering.
G4 notes
16 G-tetrads, 4 G4 helices, 4 G4 stems · 2(-P-P-P), parallel(4+0), UUUU · negative twist

Base-block schematics in six views [summary · tetrads · helices · stems · costacks · homepage]

PyMOL session file PDB file View in 3Dmol.js

List of 16 G-tetrads [summary · schematics · helices · stems · costacks · homepage]

 1 glyco-bond=---- groove=---- planarity=0.163 type=other  nts=4 GGGG A.DG1,A.DG5,A.DG10,A.DG14
 2 glyco-bond=---- groove=---- planarity=0.156 type=planar nts=4 GGGG A.DG2,A.DG6,A.DG11,A.DG15
 3 glyco-bond=---- groove=---- planarity=0.140 type=planar nts=4 GGGG A.DG17,A.DG20,A.DG23,A.DG26
 4 glyco-bond=---- groove=---- planarity=0.239 type=other  nts=4 GGGG A.DG19,A.DG22,A.DG25,A.DG28
 5 glyco-bond=---- groove=---- planarity=0.203 type=other  nts=4 GGGG B.DG1,B.DG5,B.DG10,B.DG14
 6 glyco-bond=---- groove=---- planarity=0.294 type=other  nts=4 GGGG B.DG2,B.DG6,B.DG11,B.DG15
 7 glyco-bond=---- groove=---- planarity=0.200 type=other  nts=4 GGGG B.DG17,B.DG20,B.DG23,B.DG26
 8 glyco-bond=---- groove=---- planarity=0.305 type=other  nts=4 GGGG B.DG19,B.DG22,B.DG25,B.DG28
 9 glyco-bond=---- groove=---- planarity=0.156 type=planar nts=4 GGGG C.DG1,C.DG5,C.DG10,C.DG14
10 glyco-bond=---- groove=---- planarity=0.204 type=other  nts=4 GGGG C.DG2,C.DG6,C.DG11,C.DG15
11 glyco-bond=---- groove=---- planarity=0.132 type=planar nts=4 GGGG C.DG17,C.DG20,C.DG23,C.DG26
12 glyco-bond=---- groove=---- planarity=0.297 type=other  nts=4 GGGG C.DG19,C.DG22,C.DG25,C.DG28
13 glyco-bond=---- groove=---- planarity=0.096 type=planar nts=4 GGGG D.DG1,D.DG5,D.DG10,D.DG14
14 glyco-bond=---- groove=---- planarity=0.169 type=other  nts=4 GGGG D.DG2,D.DG6,D.DG11,D.DG15
15 glyco-bond=---- groove=---- planarity=0.158 type=planar nts=4 GGGG D.DG17,D.DG20,D.DG23,D.DG26
16 glyco-bond=---- groove=---- planarity=0.261 type=other  nts=4 GGGG D.DG19,D.DG22,D.DG25,D.DG28

List of 4 G4-helices [summary · schematics · tetrads · stems · costacks · homepage]

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, 4 G-tetrad layers, INTRA-molecular, with 1 stem

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG2,A.DG6,A.DG11,A.DG15
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG1,A.DG5,A.DG10,A.DG14
 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG A.DG26,A.DG23,A.DG20,A.DG17
 4  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG A.DG25,A.DG22,A.DG19,A.DG28
  step#1  mp(<<,backward) area=10.09 rise=3.26 twist=34.6
  step#2  mm(<>,outward)  area=28.42 rise=3.36 twist=-10.5
  step#3  pm(>>,forward)  area=11.11 rise=3.25 twist=-27.0
  strand#1 DNA glyco-bond=---- nts=4 GGGG A.DG2,A.DG1,A.DG26,A.DG25
  strand#2 DNA glyco-bond=---- nts=4 GGGG A.DG6,A.DG5,A.DG23,A.DG22
  strand#3 DNA glyco-bond=---- nts=4 GGGG A.DG11,A.DG10,A.DG20,A.DG19
  strand#4 DNA glyco-bond=---- nts=4 GGGG A.DG15,A.DG14,A.DG17,A.DG28

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3 stacking diagrams
 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG2,A.DG6,A.DG11,A.DG15
2 glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG1,A.DG5,A.DG10,A.DG14
step#1 mp(<<,backward) area=10.09 rise=3.26 twist=34.6

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 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG1,A.DG5,A.DG10,A.DG14
3 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG A.DG26,A.DG23,A.DG20,A.DG17
step#2 mm(<>,outward) area=28.42 rise=3.36 twist=-10.5

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 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG A.DG26,A.DG23,A.DG20,A.DG17
4 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG A.DG25,A.DG22,A.DG19,A.DG28
step#3 pm(>>,forward) area=11.11 rise=3.25 twist=-27.0

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Helix#2, 4 G-tetrad layers, INTRA-molecular, with 1 stem

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG2,B.DG6,B.DG11,B.DG15
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG1,B.DG5,B.DG10,B.DG14
 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG B.DG26,B.DG23,B.DG20,B.DG17
 4  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG B.DG25,B.DG22,B.DG19,B.DG28
  step#1  mp(<<,backward) area=9.41  rise=3.28 twist=34.0
  step#2  mm(<>,outward)  area=27.89 rise=3.30 twist=-10.4
  step#3  pm(>>,forward)  area=11.97 rise=3.21 twist=-26.1
  strand#1 DNA glyco-bond=---- nts=4 GGGG B.DG2,B.DG1,B.DG26,B.DG25
  strand#2 DNA glyco-bond=---- nts=4 GGGG B.DG6,B.DG5,B.DG23,B.DG22
  strand#3 DNA glyco-bond=---- nts=4 GGGG B.DG11,B.DG10,B.DG20,B.DG19
  strand#4 DNA glyco-bond=---- nts=4 GGGG B.DG15,B.DG14,B.DG17,B.DG28

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3 stacking diagrams
 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG2,B.DG6,B.DG11,B.DG15
2 glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG1,B.DG5,B.DG10,B.DG14
step#1 mp(<<,backward) area=9.41 rise=3.28 twist=34.0

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 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG1,B.DG5,B.DG10,B.DG14
3 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG B.DG26,B.DG23,B.DG20,B.DG17
step#2 mm(<>,outward) area=27.89 rise=3.30 twist=-10.4

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 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG B.DG26,B.DG23,B.DG20,B.DG17
4 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG B.DG25,B.DG22,B.DG19,B.DG28
step#3 pm(>>,forward) area=11.97 rise=3.21 twist=-26.1

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Helix#3, 4 G-tetrad layers, INTRA-molecular, with 1 stem

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG2,C.DG6,C.DG11,C.DG15
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG1,C.DG5,C.DG10,C.DG14
 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG C.DG26,C.DG23,C.DG20,C.DG17
 4  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG C.DG25,C.DG22,C.DG19,C.DG28
  step#1  mp(<<,backward) area=9.17  rise=3.21 twist=36.2
  step#2  mm(<>,outward)  area=28.10 rise=3.35 twist=-9.7
  step#3  pm(>>,forward)  area=11.25 rise=3.25 twist=-26.0
  strand#1 DNA glyco-bond=---- nts=4 GGGG C.DG2,C.DG1,C.DG26,C.DG25
  strand#2 DNA glyco-bond=---- nts=4 GGGG C.DG6,C.DG5,C.DG23,C.DG22
  strand#3 DNA glyco-bond=---- nts=4 GGGG C.DG11,C.DG10,C.DG20,C.DG19
  strand#4 DNA glyco-bond=---- nts=4 GGGG C.DG15,C.DG14,C.DG17,C.DG28

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3 stacking diagrams
 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG2,C.DG6,C.DG11,C.DG15
2 glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG1,C.DG5,C.DG10,C.DG14
step#1 mp(<<,backward) area=9.17 rise=3.21 twist=36.2

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 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG1,C.DG5,C.DG10,C.DG14
3 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG C.DG26,C.DG23,C.DG20,C.DG17
step#2 mm(<>,outward) area=28.10 rise=3.35 twist=-9.7

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 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG C.DG26,C.DG23,C.DG20,C.DG17
4 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG C.DG25,C.DG22,C.DG19,C.DG28
step#3 pm(>>,forward) area=11.25 rise=3.25 twist=-26.0

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Helix#4, 4 G-tetrad layers, INTRA-molecular, with 1 stem

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG2,D.DG6,D.DG11,D.DG15
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG1,D.DG5,D.DG10,D.DG14
 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG D.DG26,D.DG23,D.DG20,D.DG17
 4  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG D.DG25,D.DG22,D.DG19,D.DG28
  step#1  mp(<<,backward) area=7.72  rise=3.30 twist=36.1
  step#2  mm(<>,outward)  area=28.74 rise=3.37 twist=-11.2
  step#3  pm(>>,forward)  area=11.00 rise=3.21 twist=-27.0
  strand#1 DNA glyco-bond=---- nts=4 GGGG D.DG2,D.DG1,D.DG26,D.DG25
  strand#2 DNA glyco-bond=---- nts=4 GGGG D.DG6,D.DG5,D.DG23,D.DG22
  strand#3 DNA glyco-bond=---- nts=4 GGGG D.DG11,D.DG10,D.DG20,D.DG19
  strand#4 DNA glyco-bond=---- nts=4 GGGG D.DG15,D.DG14,D.DG17,D.DG28

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3 stacking diagrams
 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG2,D.DG6,D.DG11,D.DG15
2 glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG1,D.DG5,D.DG10,D.DG14
step#1 mp(<<,backward) area=7.72 rise=3.30 twist=36.1

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 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG1,D.DG5,D.DG10,D.DG14
3 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG D.DG26,D.DG23,D.DG20,D.DG17
step#2 mm(<>,outward) area=28.74 rise=3.37 twist=-11.2

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 3  glyco-bond=---- groove=---- Major-->WC nts=4 GGGG D.DG26,D.DG23,D.DG20,D.DG17
4 glyco-bond=---- groove=---- Major-->WC nts=4 GGGG D.DG25,D.DG22,D.DG19,D.DG28
step#3 pm(>>,forward) area=11.00 rise=3.21 twist=-27.0

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List of 4 G4-stems [summary · schematics · tetrads · helices · costacks · homepage]

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, 2 G-tetrad layers, 3 loops, INTRA-molecular, UUUU, parallel, 2(-P-P-P), parallel(4+0)

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG1,A.DG5,A.DG10,A.DG14
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG A.DG2,A.DG6,A.DG11,A.DG15
  step#1  pm(>>,forward)  area=10.09 rise=3.26 twist=34.6
  strand#1  U DNA glyco-bond=-- nts=2 GG A.DG1,A.DG2
  strand#2  U DNA glyco-bond=-- nts=2 GG A.DG5,A.DG6
  strand#3  U DNA glyco-bond=-- nts=2 GG A.DG10,A.DG11
  strand#4  U DNA glyco-bond=-- nts=2 GG A.DG14,A.DG15
  loop#1 type=propeller strands=[#1,#2] nts=2 TT A.DT3,A.DT4
  loop#2 type=propeller strands=[#2,#3] nts=3 TGT A.DT7,A.DG8,A.DT9
  loop#3 type=propeller strands=[#3,#4] nts=2 TT A.DT12,A.DT13

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Stem#2, 2 G-tetrad layers, 3 loops, INTRA-molecular, UUUU, parallel, 2(-P-P-P), parallel(4+0)

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG1,B.DG5,B.DG10,B.DG14
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG B.DG2,B.DG6,B.DG11,B.DG15
  step#1  pm(>>,forward)  area=9.41  rise=3.28 twist=34.0
  strand#1  U DNA glyco-bond=-- nts=2 GG B.DG1,B.DG2
  strand#2  U DNA glyco-bond=-- nts=2 GG B.DG5,B.DG6
  strand#3  U DNA glyco-bond=-- nts=2 GG B.DG10,B.DG11
  strand#4  U DNA glyco-bond=-- nts=2 GG B.DG14,B.DG15
  loop#1 type=propeller strands=[#1,#2] nts=2 TT B.DT3,B.DT4
  loop#2 type=propeller strands=[#2,#3] nts=3 TGT B.DT7,B.DG8,B.DT9
  loop#3 type=propeller strands=[#3,#4] nts=2 TT B.DT12,B.DT13

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Stem#3, 2 G-tetrad layers, 3 loops, INTRA-molecular, UUUU, parallel, 2(-P-P-P), parallel(4+0)

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG1,C.DG5,C.DG10,C.DG14
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG C.DG2,C.DG6,C.DG11,C.DG15
  step#1  pm(>>,forward)  area=9.17  rise=3.21 twist=36.2
  strand#1  U DNA glyco-bond=-- nts=2 GG C.DG1,C.DG2
  strand#2  U DNA glyco-bond=-- nts=2 GG C.DG5,C.DG6
  strand#3  U DNA glyco-bond=-- nts=2 GG C.DG10,C.DG11
  strand#4  U DNA glyco-bond=-- nts=2 GG C.DG14,C.DG15
  loop#1 type=propeller strands=[#1,#2] nts=2 TT C.DT3,C.DT4
  loop#2 type=propeller strands=[#2,#3] nts=3 TGT C.DT7,C.DG8,C.DT9
  loop#3 type=propeller strands=[#3,#4] nts=2 TT C.DT12,C.DT13

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Stem#4, 2 G-tetrad layers, 3 loops, INTRA-molecular, UUUU, parallel, 2(-P-P-P), parallel(4+0)

 1  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG1,D.DG5,D.DG10,D.DG14
 2  glyco-bond=---- groove=---- WC-->Major nts=4 GGGG D.DG2,D.DG6,D.DG11,D.DG15
  step#1  pm(>>,forward)  area=7.72  rise=3.30 twist=36.1
  strand#1  U DNA glyco-bond=-- nts=2 GG D.DG1,D.DG2
  strand#2  U DNA glyco-bond=-- nts=2 GG D.DG5,D.DG6
  strand#3  U DNA glyco-bond=-- nts=2 GG D.DG10,D.DG11
  strand#4  U DNA glyco-bond=-- nts=2 GG D.DG14,D.DG15
  loop#1 type=propeller strands=[#1,#2] nts=2 TT D.DT3,D.DT4
  loop#2 type=propeller strands=[#2,#3] nts=3 TGT D.DT7,D.DG8,D.DT9
  loop#3 type=propeller strands=[#3,#4] nts=2 TT D.DT12,D.DT13

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List of 0 G4 coaxial stacks [summary · schematics · tetrads · helices · stems · homepage]

List of 8 non-stem G4-loops (including the two closing Gs)

 1 type=V-shaped  helix=#1 nts=4 GTGG A.DG17,A.DT18,A.DG19,A.DG20
 2* type=V-shaped  helix=#1 nts=4 GGTG A.DG25,A.DG26,A.DT27,A.DG28
 3 type=V-shaped  helix=#2 nts=4 GTGG B.DG17,B.DT18,B.DG19,B.DG20
 4* type=V-shaped  helix=#2 nts=4 GGTG B.DG25,B.DG26,B.DT27,B.DG28
 5 type=V-shaped  helix=#3 nts=4 GTGG C.DG17,C.DT18,C.DG19,C.DG20
 6* type=V-shaped  helix=#3 nts=4 GGTG C.DG25,C.DG26,C.DT27,C.DG28
 7 type=V-shaped  helix=#4 nts=4 GTGG D.DG17,D.DT18,D.DG19,D.DG20
 8* type=V-shaped  helix=#4 nts=4 GGTG D.DG25,D.DG26,D.DT27,D.DG28