Once a peptide has been created by a ribosome, it may require further chemical groups to be added or removed from its component amino acids in order for it to function correctly. 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. Title and abstract TOC Appendix C Send your comments.