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protein complex
This term is used exclusively in scientific and academic contexts, specifically within biochemistry, molecular biology, and genetics. It describes a higher-order structure where multiple polypeptide chains (subunits) associate to form a functional unit. It is a formal technical term; in casual conversation, a scientist might simply refer to it as a "complex" if the context of proteins has already been established.
Distinguish this from a "single protein" or "monomer." While a single protein can be functional on its own, a protein complex implies a synergistic relationship where the assembly of multiple parts is required for the biological activity to occur. The term emphasizes the structural interdependence of the components.
When discussing these structures, researchers often focus on "stoichiometry" (the ratio of the different proteins within the complex) and "assembly" (the process by which the individual proteins come together).
Meanings
Examples
The ribosome is a massive protein complex responsible for protein synthesis.
We need to isolate the protein complex before we can analyze its structure.
This specific protein complex regulates the cell cycle.
I wonder if this protein complex remains stable at room temperature.
The researchers identified a novel protein complex in the mitochondrial membrane.
Look at how this protein complex binds to the DNA strand.
A mutation in one subunit can destabilize the entire protein complex.
The enzyme functions as part of a larger protein complex.