echo "Starting overview of protein structure."
echo 
echo
echo "Beginning with all alpha proteins."
echo
echo
echo "Loading Horse Heart Myoglobin structure..."
load 1YMB.pdb
select *
ribbon
echo "Note the all helical structure of myoglobin."
pause
echo "Myoglobin binds hemoglobin via a single heme group."
echo "The heme group will be highlighted."
select ligand
spacefill
rotate x -14
rotate y -70
rotate z -23
echo
echo "Note the central iron atom."
pause
zap
echo
echo "Cytochrome C (horse heart, mitochondrial) is also an all alpha protein"
echo "that binds a heme group."
load 1HRC.pdb
pause
echo
echo "Notice that in horse heart cytochrome C the heme group is covalently"
echo "linked to the protein via thioether bonds to CYS 14 & 17."
select ligand
wireframe 40
spacefill 120
select atomno==828
spacefill 200
select 14
wireframe 40
spacefill 120
select 17
wireframe 40
spacefill 120
select *
cartoon
pause
echo
echo "Note that the heme group is more exposed in cytochrome C than in"
echo "myoglobin."
slab off
rotate x -249
rotate y 114
rotate z -24
pause
zap
