Definitions of protein structures

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NH2-CRH-COOH

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4 Terms

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primary

order of amino acids in polypeptide chain (polymer)

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secondary

sequence of amino acids causes parts of protein molecule to bend into alpha helix shape or fold into beta pleated sheets

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tertiary

further folding of the secondary structure to form a unique 3D shape, held in place by ionic, hydrogen and disulphide bonds

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quaternary

a protein made of more than one polypeptide chain