quaternary structure


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quaternary structure

n.
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.
References in periodicals archive ?
SWISS-MODEL: Modelling protein tertiary and quaternary structure using evolutionary information.
There are two major categories of proteins with quaternary structure - fibrous and globular.
Despite this, says Ahnert, the organizing principles that underlie protein quaternary structure in nature are poorly understood.
The treatment of protein structure in many introductory textbooks, however, is cursory and focuses on the relationships among primary, secondary, tertiary, and quaternary structure without a clear link to how these levels of organization contribute to functional aspects of the protein.
It is noteworthy that quaternary structure is essential for CTB function, but this is impossible in some expression systems (9), (11), (15).
This time he focuses upon The School of Athens and the quaternary structure of Quixote's first part.