echo "The next beta structure is known as the greek key."
echo "This name comes from the protein's similarity to"
echo "a pattern used by the ancient Greeks."
echo "The example molecule is Staph nuclease."
load 1SNO.pdb
rotate x -78
rotate y -42
rotate z 12
wireframe off
cartoon
pause
echo
echo "The Greek key structure is composed of five beta strands."
echo "These strands are easily visualized when color coded."
select 9-17
color red
select 22-27
color orange
select 30-36
color yellow
select 72-76
color green
select 88-94
color blue
echo "The color coding is according to the rainbow. The red "
echo "strand is 9-17, the orange 22-27, the yellow 30-36 (note"
echo "the intervening helix before the final two strands), the"
echo "green 72-76 and the blue 88-94."
pause
zap