17.3 primary and secondary structures

what can the function of a protein be altered by

the primary, secondary and tertiary structure

what is the primary structure

the number, type and order of amino acids joined together

what is the order of amino acids due to

the way interactions occur with nearby amino acids, leading to the folding of a protein chain

what is the secondary structure of proteins

the H bonds between NH and C=O in peptide links form at regular intervals; alpha helix/beta pleated sheet.

define alpha helix

regions in the molecule that coil into a spiral shape

define the beta pleated sheet

sections lining up parallel to each other; H bonds form between Peptide links to produce 2 regions where 2 or more parts of polypeptide chain line up

how are beta pleated sheet structures stabilised

the repeating sequence of the backbone allows H bonds to occur at regular intervals

what bonds are involved with the primary structure of proteins

covalent bonds between monomers

what bonds are involved with the secondary structure of proteins

H-bonds in peptide links