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Which of the following elements is cofactor/activator for RUBISCO?

Which of the following elements is cofactor/activator for RUBISCO? Correct Answer Mg

Concept-

  • RUBISCO ( ribulose, 1, 5-biphosphate carboxylase/oxygenase) is the world's single most abundant protein.
  • RUBISCO (enzyme) found in the stroma.
  • RUBISCO accounts for half of the total chloroplast protein.
  • RUBISCO catalyzes two different reactions-
    • Adding CO2 to ribulose biphosphate (RuBP) - the carboxylase activity.
    • Adding O2 to ribulose biphosphate (RuBP) - the oxygenase activity.

Explanation-

  • The cofactor is a nonprotein part of the holoenzyme. It may be inorganic or organic in nature.
  • The term cofactor is used for the general term encompassing -
    • (a) Prosthetic group (b) Coenzyme  (c) Metal activators.

So, Mg++ is the metal activator required for the RUBISCO enzyme.

Additional Information

  • RUBISCO is the main enzyme for the C3 cycle.
  • RUBISCO present in Bundle sheath cells, while PEPcase present in mesophyll cells.

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