These chemical changes that occur after translation are called post-translational modifications. Protein A concept that describes the object responsible for a particlar type of function in a cell. The idea is now narrowed to included only complexes of folded and modified linear polypeptide chains. Subunit Subunit is a word that is rather loosely defined, and it is frequently used in lab jargon to mean a variety of closely related things. Subunits associate with each other to form a protein via non-covalent interactions.
Many proteins contain only one type of subunit.
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