multienzyme

https://doi.org/10.1351/goldbook.M04046
A protein possessing more than one catalytic function contributed by distinct parts of a polypeptide chain ('domains'), or by distinct subunits, or both.
Source:
White Book, 2nd ed., p. 107 (https://www.qmul.ac.uk/sbcs/iupac/bibliog/white.html)