has part molecular_function protein binding molecular function regulator activity https://github.com/geneontology/go-ontology/issues/20854 https://github.com/geneontology/go-ontology/issues/20862 https://github.com/geneontology/go-ontology/issues/25165 molecular function regulator A molecular function regulator regulates the activity of its target via non-covalent binding that does not result in covalent modification to the target. Examples of molecular function regulators include regulatory subunits of multimeric enzymes and channels. Mechanisms of regulation include allosteric changes in the target and competitive inhibition. This term should only be used in cases when the regulator directly interacts with the enzyme, but does not result in a covalent modification. molecular_function GO:0098772