Proteins

• Proteins


  Polymers of amino acids joined together by condensation reactions and by peptide
• Dipeptides


  2 amino acids
• Polypeptides chain


  + 2 amino acids
• Gene


  Sequence of DNA bases which codes for a sequence of amino acids / R groups in a protein / polypeptide chain
• Types of r groups


  + and - ( ionic bonds), delta + and delta -( hydrogen bonds ) and sulphur ( disulphide bridge )
• Primary shape


  Sequence chain of amino acids
• Primary bonds


  Peptide bonds, located in NH2 of one amino acid and COOH of another
• Secondary shape


  Folded polypeptide chain, alpha helix, beta pleated sheet
• Secondary bonds


  Hydrogen bonds, located between peptidebonds
• Tertiary shape


  Further folding of polypeptide chain into overall 3D shape
• Tertiary bonds


  Hydrogen, ionic and disulphide, all between r groups
• Quaternary shape


  Protein with more than one polypeptide chain
• Quaternary bonds


  Hydrogen, ionic and disulphide, located between polypeptide chains.
• Biochemical test for protein ( peptide bonds)


  Add biuret's solution from blue to purple