Helical Wheel
| Structural Parameters for Protein Secondary Structure | |||||
|---|---|---|---|---|---|
|
Structure
|
phi
|
psi
|
n | d | p |
|
a-helix
|
-57°
|
-47°
|
3.6
|
1.5
|
5.5
|
|
310-helix
|
-49°
|
-26°
|
3.0
|
2.0
|
6.0
|
|
Polyproline II helix
|
-79°
|
+149°
|
3.0
|
3.1
|
9.4
|
|
|
|||||
|
Parallel b-strand
|
-119°
|
+113°
|
2.0
|
3.2
|
6.4
|
|
Antiparallel b-strand
|
-139°
|
+135°
|
2.0
|
3.4
|
6.8
|
Helical Wheel
- http://www-nmr.cabm.rutgers.edu/bioinformatics/Proteomic_tools/Helical_wheel/
- Example: hellical wheel for Helix D from the a subunit of human hemoglobin
- Sequence: AQVKGHGKKVADALTNAV
