Ensemble of two or more different associated proteins, each with a specific function, linked by non-covalent protein-protein interactions.
Notes: - Protein complexes are required for most biological processes. Together they form molecular machines that perform biological functions.
- Proteins with quaternary structure are not considered as protein complexes.
Example: Anaphase promoting complex.
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1160 (https://doi.org/10.1515/pac-2016-1120)