Sandbox 1742

Protein Secondary Structure Activity: Peptide 1

spinqualitylabelsall models Peptide 1 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D The structure at the right is an 11-amino acid peptide fragment of a larger protein. Use the green links in the text below to view different representations of this peptide to help you answer the questions in your activity handout. Representations Ball and stick representations: with side chains, or with protein backbone only Space fill representations: with side chains, or with protein backbone only Ribbon representation: with protein backbone only Displaying Hydrogen Bonds Let's view the hydrogen bonds that can be calculated from optimal distances/angles in this structure: for the structure with side chains, or with protein backbone only. Use one of these representations to measure the distances necessary to complete the table in your activity. A Reminder on Measuring Distances Between Atoms You might want to toggle off the spinning of the molecule (see spin button in lower left corner of the structure box). Put your cursor in the structure window. Decide on two atoms for which you would like to measure the distance between them. Using your cursor, hover over one atom and double-click on that first atom. Drag the cursor to the next atom and double click on the second atom. A distance label should now appear on the structure. Note that if the model gets cluttered, you may want to remove the distance labels. You can do this (and many other things!) by accessing the JSmol menu in the structure window. Hover the cursor inside the structure window, right click (control-click on your macbook), and scroll down to "Measurements" and choose "Delete measurements". You can also use this JSmol window to change the distance units.