This web page uses the open-source Java Applet program Jmol, a proposed platform-independent replacement for Chime and Rasmol, neither of which is available in an OS X native version. You will need a relatively recent Java Virtual Machine to use it. Currently using Jmol 13.0.18.

 

This is the sequence of the idealized antiparallel beta sheet in its real context, the amylase inhibitor protein tendamistat (from PDB ID 3AIT). Buttons parallel those for the beta sheet. Right-click or control-click to bring up the menu and use the built-in rendering commands to explore.

Go to the alpha helix.

Click here for the same alpha helix in a real protein (the GCN4-DNA complex).

Click here for the idealized beta sheet.
Teaching resources. J. Kahn home page.