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Complexed proteins are linked by non-covalent protein–protein interactions. These complexes function to perform many biological processes inside the cell.

A multiprotein complex (or protein complex) is a group of two or more associated
Select Option polysaccharidepolypeptide lipoprotein
chains. The different chains may have different functions. Multiprotein complexes are examples of the
Select Option primarysecondarytertiaryquaternary
level of protein organization. An example of a protein complex is the Bacillus amyloliquefaciens ribonuclease barnase and its inhibitor barstar, shown below.

The Bacillus amyloliquefaciens ribonuclease barnase (purple and yellow) and its inhibitor barstar (blue) in a complex. Regalis, Opabinia. Wikimedia Foundation, 5 Aug. 2006. Web. 17 Sept. 2016. https://commons.wikimedia.org/wiki/File:Barnase-barstar-1brs.png.

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