Experimental Assessment of Secondary Structure by Circular Dichroism
All proteins in nature have evolved, through selective pressure, to perform specific functions. These functions depend upon their three-dimensional structures arising from sequences of amino acids in the polypeptide chain and adopting secondary structures that interact through long-range interactions within the three-dimensional structure. In this entry, a review of the structure of proteins will be presented as well as the spectroscopic and energetic basis of circular dichroism (CD) utilized extensively to assess secondary structure of proteins.
An amino acid is the basic building block of proteins. All amino acids have a central carbon atom (called Cα) to which a hydrogen atom, an amino group (NH2), and a carboxyl group (COOH) are attached. The major distinction between amino acids lies in the side chain attached to the Cα through the fourth valence. The four groups attached to the Cα atom are chemically different for all the amino acids...
KeywordsCircular Dichroism Circular Dichroism Spectrum Positive Band Negative Band Circular Dichroism Signal
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