An example of a posttranslational modification of an enzyme that produces an enzyme isoform would be:

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Posttranslational modification of carbohydrate side chains can result in different isoforms of an enzyme. This can affect the enzyme's stability, activity, and localization. Examples of posttranslational modifications of carbohydrate side chains include glycosylation and phosphorylation. Association of different types of subunits in various combinations in an oligomer can also produce enzyme isoforms, but this is not a posttranslational modification. Modification of genes at different loci and existence of different allelic genes can produce different enzyme isoforms, but these are not posttranslational modifications.

An Example of a Posttranslational Modification of an Enzyme That