General Interview Questions - Protein Activity

How is protein activity regulated?

Which types of post-translational modifications are reversible.

What types of functions can proteins perform?

Why are proteins not suitable for storing genetic, particularly when compared to nucleic acids?

Describe the factors that regulate interactions between polypeptides and proteins. why do some polypeptides stick together and others do not?

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1. Protein function or activity can be regulated by the binding of other polypeptides or small molecules; this binding leads to a change in protein structure.
2. Protein function or activity can be regulated by post-translational modifications that lead to changes in protein structure.
3. Protein function or activity can be regulated by interactions between proteins.
4.Most post-translational modifications are reversible and regulated.
5. Some proteins are post-translationally modified by coupling to a lipid molecule -- such modifications regulate a protein's localization within the cell.
6. Post-translational addition of the small polypeptide ubiquitin is often used to target proteins for proteolytic degradation by the proteosome.
7. The concentration and net activity of the protein can be regulated by both the rate of its synthesis, assembly and degradation.
8. Allostery involves the regulation of protein function by molecules that bind to sites other than the protein’s active site.

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