sidechains alternating towards both sides.
sidechains we can see that the backbone describes a zigzag.
An important aspect of this extended conformation is that several beta strands, arranged in parallel,
interchain hydrogen bonds (••••••)
carbonyl groups and the nitrogens
in the peptide bonds.
In this way, a beta sheet or beta pleated sheet
can be formed
(move it to see it well)
In models for large proteins, the portions with beta strand conformation are usually rendered in a simplified “cartoon” form as a ribbon with arrowhead (this pointing towards the C-terminal end); 2 styles: