This article is about tertiary structure in protein. For the article about tertiary structure in nucleic acid, see Nucleic acid tertiary structure.
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The image above contains clickable links This diagram (which is interactive) of protein structure uses PCNA as an example. (PDB: 1AXC)The tertiary structure of a protein consists of the way a polypeptide is formed of a complex molecular shape. This is caused by R-group interactions such as ionic and hydrogen bonds, disulphide bridges, and hydrophobic & hydrophilic interactions.
Protein tertiary structure is the three-dimensional shape of a protein. The tertiary structure will have a single polypeptide chain "backbone" with one or more protein secondary structures, the protein domains. Amino acid side chains and the backbone may interact and bond in a number of ways. The interactions and bonds of side chains within a particular protein determine its tertiary structure. The protein tertiary structure is defined by its atomic coordinates. These coordinates may refer either to a protein domain or to the entire tertiary structure.[1][2] A number of these structures may bind to each other, forming a quaternary structure.[3]
^IUPAC, Compendium of Chemical Terminology, 2nd ed. (the "Gold Book") (1997). Online corrected version: (2006–) "tertiary structure". doi:10.1351/goldbook.T06282
^Branden C. and Tooze J. "Introduction to Protein Structure" Garland Publishing, New York. 1990 and 1991.
^Kyte, J. "Structure in Protein Chemistry." Garland Publishing, New York. 1995. ISBN 0-8153-1701-8
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