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Which of the following enzymes catalyze the ADP-ribosylation of key cellular enzymes or proteins?

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Which of the following enzymes catalyze the ADP-ribosylation of key cellular enzymes or proteins?

(a) Diphteria toxin and cholera toxin

(b) Dinitrogenase reductase

(c) Protein phosphatases

(d) Kinase

This question was posed to me in final exam.

I need to ask this question from Regulatory Enzymes in section Enzymes, Carbohydrates and Gycobiology of Biochemistry

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The correct choice is (a) Diphteria toxin and cholera toxin

To elaborate: The enzymes that catalyse the ADP-ribosylation and inactivation of key cellular enzymes or proteins are diphteria toxin and cholera toxin.

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