Levels of protein structure - created from Mind Map

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Primary

Secondary

Tertiary

Quaternary

Sequence of amino acids in the polypeptide chain

Peptide bonds between adjacent amino acis

Determined by genetic code - sequences of bases in DNA

Determine how the poly peptide folds - final shape

Folding of regions into ALPHA HELIX or BETA PLEATED SHEET

H bonds between N-H and C=O groups

Structure depends on the spacing and position of amino acids in the polypeptide - depends on primary

3D folding of polypeptide chains

Determined by interactions between R-groups of the amino acids

Hydrophobic/phillic interactions (weak between polar/non)

H bonds - v weak

Ionic bonds - oppositely charged R groups

Disulphide bonds - strong covalent bonds between S containing R groups

Association between two/more polypeptide subunits

not all have

Held by R-groups on different polypeptide chains

Haemoglobin