The complete structure of a protein can be described at four different levels of complexity: primary, secondary, tertiary, and quaternary structure.Īs a multitude of protein structures are rapidly being determined by X‐ray crystallography and by nuclear magnetic resonance (NMR), it is becoming clear that the number of unique folds is far less than the total number of protein structures. Proteins fold into stable three‐dimensional shapes, or conformations, that are determined by their amino acid sequence.
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