protein structure levels


primary structure

- the sequence of amino acids in the polypeptide chain

-held together by peptide bonds in between the chains

-a dipeptide is when there are two maino acids

-a polypeptide is when there is more than two amino acids

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secondary structure

-hydrogen bonds form between amino acids in the chain

-this makes it fold into either an alpha helix or a beta pleated sheet

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tertiary structure

-further coiling or folding of the chains

-more bonds form between different parts of the chain

-bonds that hold the tertiary structure are ionic, disulfide, hydrophobic and hydrophillic and hydrogen bonds

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quaternary structure

-more than one polypeptide chain


can be influenced by all bonds that affect proteins

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