Proteins are made from long changes of amino acids
- a Dipeptide is formed when two amino acids join together
- a Polypeptide is formed when more than two amino acids join together
- Protein are made up of one or more polypeptides.
Amino acid and variation group
- All amino acids have the same general structure
- a carboxyl group (-COOH)
- an amino acid (-NH2) attached to a carbon atom
- The difference between the amino acids is the variable group (R) they contain.
Amino acids joined together by peptide bonds
- Amino acids are linked by peptide bonds - forming dipeptides and polypeptides
- A molecule of water is released during a reaction
- The reverse of this reaction - water molecule is added to beaked the peptide bonds. This is called a hydrolysis reaction.
- Primary structure - sequence of amino acids in the polypeptide chain
- Secondary structure - polypeptide chain doesn’t remain flat or straight. Hydrogen bonds form between the amino acids in the chain. Make it automatically coil into a alpha (α) helix or fold into a beta (β) pleated sheet.
- Tertiary Structure - coiled or folded chain of amino acids often coiled or folded…