For 10 points, name this inefficient enzyme, arguably the most abundant on earth, which is a key component in both photorespiration and the Calvin cycle.
Specialized organelles like pyrenoids contain high concentrations of this enzyme, which may be quantified in a lab using the transition state analogue CABP. Â Activation of this enzyme involves carbamylating a lysine residue which, along with aspartate, binds a magnesium ion to form its active site. Â Eubacteria and dinoflagellates typically make the dimeric form of this enzyme, while (*) plants and algae Â produce it as a hexadecamer. Â That hexadecamer includes eight large subunits which are encoded by the chloroplast genome. Â This protein yields the byproduct 2-phosphoglycolate when it uses oxygen as a substrate. Â When carrying out a different function, it produces an unstable six-carbon molecule that immediately breaks down into 3-phosphoglycerate. Â It can act as both a carboxylase and oxygenase. Â For 10 points, name this inefficient enzyme, arguably the most abundant on earth, which is a key component in both photorespiration and the Calvin cycle.
Specialized organelles like pyrenoids contain high concentrations of this enzyme, which may be quantified in a lab using the transition state analogue CABP.
RuBisCO