Quaternary-structure meaning

The structure formed by the noncovalent interaction of two or more macromolecules, such as that formed by four globin protein molecules to make hemoglobin or that formed by histones interacting with DNA to make a nucleosome.
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The three-dimensional arrangement of the macromolecules making up a functional unit, such as that formed by four globin protein molecules to make hemoglobin or by histones interacting with DNA to make a nucleosome.
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The structure that is formed by the joining together of two or more proteins or nucleic acids. The functions of the proteins and nucleic acids are only expressed correctly when they are joined together.
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(biochemistry, molecular biology) The arrangement of multiple folded or coiled proteins to form a multi-subunit complex.
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