Protein Structures

Primary, secondary, tertiary and quaternary structures of proteins.

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Primary Structure

 

 The sequence of amino acids in a polypeptide chain.

 

The linear shape of a polypetide chain caused by peptide bonds, disulfide bridges and Hydrogen bonds.

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Secondary Structure

The coiling of an amino acid chain into a spiral structure.

 

e.g. alpha helices, beta pleated sheets.

 

Held together by hydrogen bonds and disulfide bridges

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Tertiary Structure

The irregular folding of a polypeptide chain into a globular (3 dimensional) shape.

 

Held together by hydrogen bonds and disulfide bridges.

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Quaternary Structure

The association of several poylpeptide chains.

 

e.g. Haemoglobin- two alpha helices and two beta pleated sheets.

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