Helical Forms
rotations
|
translations
|
Macro Mol Structure
|
Williams Page
Helical Parameters
A-
conformation
B-
conformation
Z-
conformation
B/Z
junction
images
images
images
images
coordinates
coordinates
coordinates
coordinates
Description
underwound/compact
long/narrow
Lh
Helical Sense
RH
RH
LH
Helical Diameter
26 Å
20 Å
18 Å
Twist/Base Pair
31°
36°
-30°
Rise/Base Pair
2.6 Å
3.3 Å
3.7 Å
Base Pairs/Turn
11
10
-12
Rise/Turn (pitch)
28 Å
34 Å
45 Å
Roll (
r
)
8.0°
0.6°
0°
Propeller
-7°
-13°
Inclination
19°
-1 °
0 Å
x-disp
-5.2 Å
0.0 Å
0 Å
Groove Shape
Major Groove
Narrow, Deep
Wide, Deep
Convex Surface
Minor Groove
Wide Shallow
Narrow, Deep
Narrow, Deep
Sugar Pucker
C3'-Endo
C2'-Endo
C3'-Endo (Purines), C2'-Endo (Pyrimidines)
Glycosidic bond
(
c
)
Anti
Anti
Syn (Purines), Anti (Pyrimidines)