For 10 points, name this enzyme, which catalyzes the first step of the Calvin cycle.
This enzyme's activase has two isoforms, the larger of which permits regulation by light or by ADP to ATP ratio, as found for one organism via its incubation with thioredoxin-f. Its inactive form can be carbamylated on a lysine residue, then inhibited. This enzyme produces phosphoglycolate, beginning an undesirable sequence of reactions that is hedged against by CAM and that is called photorespiration, owing to the similarity in bond length between diatomic oxygen and its normal substrate, which is transformed into an unstable six-carbon intermediate that splits to give two molecules of PGA. For 10 points, name this enzyme, which catalyzes the first step of the Calvin cycle.
This enzyme's activase has two isoforms, the larger of which permits regulation by light or by ADP to ATP ratio, as found for one organism via its incubation with thioredoxin-f.
{rubisco} [or {ribulose}-{1,5}-{bisphosphate carboxylase oxygenase}]