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Removal of phosphoryl groups is catalyzed by ___________

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Removal of phosphoryl groups is catalyzed by ___________

(a) Diphteria toxin and cholera toxin

(b) Dinitrogenase reductase

(c) Protein phosphatases

(d) Protein kinases

I had been asked this question in a job interview.

My query is from Regulatory Enzymes in division Enzymes, Carbohydrates and Gycobiology of Biochemistry

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Correct choice is (c) Protein phosphatases

Best explanation: The enzymes that catalyze the ADP-ribosylation and inactivation of key cellular enzymes or proteins are diphteria toxin and cholera toxin. Dinitrogenase reductase is responsible for the regulation of biological nitrogen fixation. The attachment of phosphoryl groups to specific amino acid residues is catalyzed by protein kinases.

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