CPK Color Scheme
C O N P
This tutorial will allow you to compare rubisco before and after activation by rubisco activase. View both structures as cartoons, with each subunit a different color and the substrates in CPK as stick figures.
Notice that the activated Rubisco structure (right side) is a homo-tetramer, not an octamer. Also, the activated structure has bound to it an inhibitor rather than a genuine substrate as seen on the inactive rubisco (left side).
Left side: Zoom in to see several copies of the substrate ribulose 1,5-bisphosphate. Does every rubisco subunit binds one ribulose substrate?
Right side: Zoom in to see several copies of a 6-carbon inhibitor (CAP) in CPK colors. Does every rubisco subunit binds one CAP inhibitor?
Left side: Let's get rid of all but one rubisco monomer and look more closely at its structure. The yellow amino acid is lysine #201, the 201st amino acid in rubisco. Lysine 201 will flash purple and yellow a couple times.
YOu may return to rubisco before activation by itself.
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