Arrangement of all atoms of a protein molecule or a subunit of a protein molecule in space, without regard to its relationship with neighbouring molecules or subunits.
Note: The tertiary structure represents a three-dimensional fold/organisation of a polypeptide chain, one containing specific arrangements of secondary structures (see secondary structure of a protein).
Source:
PAC, 2018, 90, 1121. 'Terminology of bioanalytical methods (IUPAC Recommendations 2018)' on page 1165 (https://doi.org/10.1515/pac-2016-1120)