What Is the Role of the Magnesium Ion in Kinases

question 76

Multiple Choice

What is the role of the magnesium ion in kinases that require the magnesium-ATP complex to donate phosphoryl groups?

• A) maintain the configuration of the holoenzyme
• B) shield the charged phosphate groups of ATP
• C) produce an electrophilic attack on the substrate
• D) promote ionization of bound water
• E) produce ionization of the substrate to be phosphorylated

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