Enzymes composed of subunits with diverse functions are sometimes called holoenzymes, in which some parts may be known as regulatory subunits and the functional core is known as the catalytic subunit.
Os encimas compostos por varias subunidades con diversas funcións denomínanse ás veces holoencimas, e neles algunhas partes poden denominarse subunidades regulatorias e o núcleo funcional do encima denomínase subunidade catalítica.