Tertiary structure: this is how secondary-structure elements of one polypeptide
chain come together to form a compact structure. In essence this is the folded, three-
dimensional structure of one protein molecule in isolation.
Quaternary structure: this is the structure that results when multiple proteins
and/or proteins and other molecules (RNA, DNA, small molecules) come together to
form a larger composite structure that is commonly termed a complex. Some protein
complexes consist of multiple copies of the same kind of protein coming together,
often in a highly symmetric way.
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