Peptide: Difference between revisions

This is the <scene name='Peptide~Emartz_view1~6'>backbone</scene> of 1 amino acid.  Adding to the backbone with an additional amino acid on each side gives a <scene name='Peptide~Emartz_view2~6'>tripeptide</scene> (3 amino acids).  No side groups are shown, and most hydrogens are omitted.  Now each amino acid has a 1 carbon side group so we have <scene name='Peptide~Emartz_view3~4'>Ala-Ala-Ala</scene> (tri-alanine).  Adding a carbon chain plus an NH3 on the first amino acid gives <scene name='Peptide~Emartz_view4~5'>Lys-Ala-Ala</scene>.  Adding <scene name='Peptide~Emartz_view5~4'>three more carbons</scene> to the 3rd amino acid gives [[isoleucine]]: Lys-Ala-Ile.  The 4th amino acid is threonine with its hydroxyl, giving <scene name='Peptide~Emartz_view6~2'>Lys-Ala-Ile-Thr</scene>.  Here is the shape of the <scene name='Peptide~Emartz_view7~2'>tetrapeptide</scene> (4 AAs).  The stick representation has too much detail for larger proteins, so the α-carbons are connected with a line called the <scene name='Peptide~Emartz_view8~2'>backbone trace</scene>.  Showing only the <scene name='Peptide~Emartz_view9~3'>backbone</scene> makes it easier to see the path of the protein chain (its secondary and tertiary structure).