This page contains all the figures used in the notes on tertiary alpha helix structures. You may want to keep this page open, or print this page when going through the notes.
Please also note that this page contains pdb files and you need Jmol to view, and manipulate, these images.
Figure 9.1 Alpha/beta barrel seen in triosephosphate isomerase
Alpha/beta barrel was isolated from triosephosphate isomerase (1tim.pdb). Move the protein to see the barrel-like inner core of beta strands surrounded by an outer layer of helices.You may like to try these commands:
Figure 9.2 Orientation of beta strands and helices single wound in a alpha/beta barrel
The strands and helices all flow in one direction
Figure 9.3 Active site in a alpha/beta barrel
The ligand (coloured blue) is in the active site 'pocket' formed by the loop regions which join the beta strands and the helices within the barrel
Figure 9.4 Three layer alpha/beta sandwich
3-layer alpha/beta sandwich highlighted from carboxy lyase (1pya.pdb)
Figure 9.5 Orientation of beta strands and helices doubly wound in a n-layer sandwich
Figure 9.6 Alpha/beta horseshoe
Alpha/beta horseshoe domain highlighted from ribonuclease inhibitor ( 2bnh.pdb)