restrict none set hermitelevel 4 set echo line1 50% 50% set echo line1 center color echo white font echo 16 sans bold set dotsSelectedOnly true hover Amino acid: %m (%n)|Sequence number: %r|Atom: %e; hover on echo "Quaternary Structure:||G Proteins are a family of signal proteins.||All G proteins are heterotrimers, that is, ||they consist of three different subunits ||(strings of amino acids)" moveto 0.0 { -203 -971 124 127.2} 110.5 0.0 6.6 {-3.4454994 40.278496 -46.0945} 54.1; set echo off set echo line1 50% 99% set echo line1 center color echo white font echo 16 sans bold echo "G proteins are signalling proteins.|Many G proteins have 3 subunits." delay 1 select all color chain select [gdp] color cpk select protein; spacefill 10%; delay 0.1; spacefill 20%; select [gdp]; wireframe 0.1; delay 0.1; select protein; spacefill 30%; delay 0.1; spacefill 40%; select [gdp]; wireframe 0.2; delay 0.1; select protein; spacefill 50%; delay 0.1; spacefill 60%; select [gdp]; wireframe 0.3; delay 0.1; select protein; spacefill 70%; delay 0.1; spacefill 80%; select [gdp]; wireframe 0.4; delay 0.1; select protein; spacefill 90%; delay 0.1; spacefill 100%; select [gdp]; wireframe 0.5; delay 0.1; delay 2 echo "In each subunit, some of the folds|create the binding site for another subunit. " delay 2 select protein; cartoon spacefill 90%; delay 0.1; spacefill 80%; delay 0.1; spacefill 70%; delay 0.1; spacefill 60%; delay 0.1; spacefill 50%; delay 0.1; spacefill 40%; delay 0.1; spacefill 30%; delay 0.1; spacefill 20%; delay 0.1; spacefill 10%; delay 0.1; spacefill off # --------------------- define interfaces ------------- delay 1 select :a and within(group, within(4.0, :b)) and not gtp define ~ab_connected selected select (:b and within(group, within(4.0, :a))) define ~ba_connected selected select ~ab_connected or ~ba_connected define ~aball_connected selected select :b and within(group, within(4.0, :g)) define ~bg_connected selected select (:g and within(group, within(4.0, :b))) define ~gb_connected selected select ~bg_connected or ~gb_connected define ~bgall_connected selected # --------------------- show a/b interface ------------- select ~aball_connected color atoms translucent color bonds opaque spacefill 10%; delay 0.1; spacefill 20%; delay 0.1; spacefill 30%; delay 0.1; spacefill 40%; delay 0.1; spacefill 50%; delay 0.1; spacefill 60%; delay 0.1; spacefill 70%; delay 0.1; spacefill 80%; delay 0.1; spacefill 90%; delay 0.1; spacefill 100%; delay 0.1; delay 1 moveto 1.0 { 537 -789 -299 121.4} 343.1 0.0 0.0 {-9.28767 41.394573 -41.935738} 55.4; moveto 2.0 { 537 -788 -299 121.4} 2525.8 0.0 0.0 {-9.28767 41.394573 -41.935738} 55.4; delay 1 wireframe 0.05; delay 0.1; wireframe 0.10; delay 0.1; wireframe 0.15; delay 0.1; wireframe 0.20; delay 0.1; wireframe 0.25; delay 0.1; wireframe 0.30; delay 0.1; delay 1 hbonds 0.15 delay 2 moveto 1.0 { 537 -789 -299 121.4} 343.1 0.0 0.0 {-9.28767 41.394573 -41.935738} 55.4; moveto 2.0 { -203 -971 124 127.2} 110.5 0.0 6.6 {-3.4454994 40.278496 -46.0945} 54.1; delay 2 moveto 0.0 { -203 -971 124 127.2} 110.5 0.0 6.6 {-3.4454994 40.278496 -46.0945} 54.1; # --------------------- show b/g interface ------------- delay 1 select ~bgall_connected color atoms translucent color bonds opaque spacefill 10%; delay 0.1; spacefill 20%; delay 0.1; spacefill 30%; delay 0.1; spacefill 40%; delay 0.1; spacefill 50%; delay 0.1; spacefill 60%; delay 0.1; spacefill 70%; delay 0.1; spacefill 80%; delay 0.1; spacefill 90%; delay 0.1; spacefill 100%; delay 0.1; delay 1 moveto 1.0 { 269 -921 283 138.3} 300.0 6.8 -13.2 {-15.828826 36.731636 -68.07823} 73.2; moveto 2.0 { 269 -921 283 138.3} 1474.0 -22.6 -14.9 {-15.828826 36.731636 -68.07823} 73.2; delay 1 wireframe 0.05; delay 0.1; wireframe 0.10; delay 0.1; wireframe 0.15; delay 0.1; wireframe 0.20; delay 0.1; wireframe 0.25; delay 0.1; wireframe 0.30; delay 0.1; delay 1 hbonds 0.15 delay 2 moveto 2.0 { -203 -971 124 127.2} 110.5 0.0 6.6 {-3.4454994 40.278496 -46.0945} 54.1; delay 1 echo "Notice that all three subunits are different--|thus, G proteins are heterotrimers." select all