Post-translational modifications can affect which aspects of a protein?

Post-translational modifications can affect which aspects of a protein?

• A. They only alter protein stability
• B. They only affect localization
• C. They only modulate activity
• D. They can alter activity, stability, localization, and interactions

Answer: (D)

Post-translational modifications introduce chemical changes after a protein is made, and these tweaks can influence several properties at once. For example, phosphorylation can switch an enzyme’s activity on or off by altering its active or regulatory sites. Ubiquitination often marks a protein for degradation, changing its stability and half-life. Glycosylation or lipidation can redirect where a protein sits in the cell or how it interacts with membranes, affecting localization. PTMs also modify surfaces that proteins use to bind partners, nucleic acids, or other molecules, altering interaction networks. Because these modifications can tune activity, stability, localization, and interactions simultaneously, they describe the full range of effects, not just one single aspect.

Post-translational modifications introduce chemical changes after a protein is made, and these tweaks can influence several properties at once. For example, phosphorylation can switch an enzyme’s activity on or off by altering its active or regulatory sites. Ubiquitination often marks a protein for degradation, changing its stability and half-life. Glycosylation or lipidation can redirect where a protein sits in the cell or how it interacts with membranes, affecting localization. PTMs also modify surfaces that proteins use to bind partners, nucleic acids, or other molecules, altering interaction networks. Because these modifications can tune activity, stability, localization, and interactions simultaneously, they describe the full range of effects, not just one single aspect.