Textbook Question
List three different types of posttranslational modifications that may happen to a protein and the significance of each in the context of protein function.
13. Gene Regulation in Eukaryotes
Post Translational Modifications
2:02 minutesProblem 21
Textbook Question
How may the covalent modification of a protein with a phosphate group alter its function?
Verified step by step guidance1
Understand that covalent modification refers to the addition or removal of a chemical group to a protein, which can change the protein's properties and activity.
Recognize that phosphorylation is the addition of a phosphate group (PO₄³⁻) to specific amino acid residues, commonly serine, threonine, or tyrosine, in the protein.
Consider how the addition of a negatively charged phosphate group can induce a conformational change in the protein's three-dimensional structure, potentially altering its shape and function.
Analyze how this conformational change can affect the protein's activity by either activating or inhibiting its enzymatic function, altering its interaction with other molecules, or changing its cellular localization.
Summarize that phosphorylation acts as a regulatory mechanism, allowing cells to control protein function dynamically in response to various signals.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Protein Phosphorylation
Protein phosphorylation is the covalent addition of a phosphate group, usually to serine, threonine, or tyrosine residues. This modification is catalyzed by enzymes called kinases and can change the protein's activity, interactions, or localization.
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Conformational Change
The addition of a phosphate group can induce a conformational change in the protein's structure. This structural alteration can activate or inhibit the protein's function by exposing or hiding active sites or interaction domains.
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Regulation of Protein Function
Phosphorylation acts as a regulatory mechanism, controlling processes like enzyme activity, signal transduction, and protein-protein interactions. It is reversible, allowing dynamic control through phosphatases that remove phosphate groups.
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