Secondary structure and function of proteins
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What is the secondary structure of a protein
The secondary structure of a protein occurs when the weak negatively charged nitrogen and oxygen atoms interact with the weak positively charged hydrogen atoms to form hydrogen bonds in the protein backbone
There are two shapes that can form within proteins due to the hydrogen bonds what are they
α-helix β-pleated sheet
The α-helix shape occurs when the hydrogen bonds form
between every fourth peptide bond (between the oxygen of the carboxyl group and the hydrogen of the amine group)
The β-pleated sheet shape forms when the protein
folds so that two parts of the polypeptide chain are parallel to each other enabling hydrogen bonds to form between parallel peptide bonds
What kind of proteins have mostly secondary structures
(e.g. collagen and keratin)
The secondary structure only relates to hydrogen bonds forming between
forming between the amine group and the carboxyl group (the ‘protein backbone’)
The hydrogen bonds can be broken by
high temperatures and pH changes