Which one of the following statement is incorrect regarding the enzyme for carboxylation reaction of Calvin cycle ?

RUBP is present in the metabolic center of the chloroplast, where Carbon dioxide fixation and synthesis of nucleic acids, sugars, starch, fatty acids, and some chloroplast proteins take place. RUBISCO enzyme is located in the chloroplast’s stroma, consisting of at least 15% and up to 50% of the chloroplast protein.