Nurturing Life Sciences
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#Unit 6. System Physiology – Plant
Forms I, II, and III are catalytically competent, while members of form IV lack Rubisco activity and play other roles in metabolism.
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Form I is the only type of Rubisco that harbors small subunits, and it consists of eight large and eight small subunits [L8S8]: Four dimers of large subunits [L2]4 capped by four small subunits at the top and the bottom [S4]2 build the hexadecameric structure {[S4]•[L2]4•[S4] = L8S8}
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Only three molecules of CO2 are fixed per second per molecule of rubisco at 250C.
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