glycerol kinase is the rate limiting enzyme of kreb's cycle.
what is the rate limiting enzyme of kreb's cycle?
glycerol kinase
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carboxysomes are bacterial compartments consisting of polyhedral protein shells filled with the enzyme ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) -the predominant enzyme in carbon fixation and the rate limiting enzyme in the calvin cycle-and a carbonic anhydrase. carboxysomes are thought to have evolved as a consequence of the increase in oxygen concentration in the ancient atmosphere; this is because oxygen is a competing substrate to carbon dioxide in the rubisco reaction. to overcome the inefficiency of rubisco, carboxysomes concentrate carbon dioxide inside the shell by means of co-localized carbonic anhydrase activity, which produces carbon dioxide from the bicarbonate that diffuses into the carboxysome. the resulting production of carbon dioxide near rubisco decreases the proportion of ribulose-1,5-bisphosphate oxygenation and thereby avoids costly photorespiratory reactions. the surrounding shell provides a barrier to carbon dioxide loss, helping to increase its concentration around rubisco. the carboxysome is an essential part of the carbon dioxide-concentrating mechanism (ccm).
carboxysome