User:Stephen Mills/Secondary Structure: Sheets: Difference between revisions
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The sheet shown below is composed of three strands in anti-parallel orientation. All the atoms are shown (C = green; N = blue; O = red; S = yellow; H = white). | The sheet shown below is composed of three strands in anti-parallel orientation. All the atoms are shown (C = green; N = blue; O = red; S = yellow; H = white). | ||
<Structure load='Tut_antiparallel_bsheet.pdb' size='500' frame='true' align='left' caption='' scene='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_load/3'/> | <Structure load='Tut_antiparallel_bsheet.pdb' size='500' frame='true' align='left' caption='' scene='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_load/3' name='anti_sheet'/> | ||
<scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_mainchain/3'>Click here</scene> to show only the polypeptide mainchain of each strand (NH, Cα, and C=O). | <scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_mainchain/3' target='anti_sheet'>Click here</scene> to show only the polypeptide mainchain of each strand (NH, Cα, and C=O). | ||
Identify the N- and C-termini of each strand. <scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_mainchain_labels/1'>Click here to see if you were correct.</scene> | Identify the N- and C-termini of each strand. <scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_mainchain_labels/1' target='anti_sheet'>Click here to see if you were correct.</scene> | ||
As the structure rotates you should be able to see the extended nature of each strand and the parallel orientation of the three strands. | As the structure rotates you should be able to see the extended nature of each strand and the parallel orientation of the three strands. | ||
<scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antipara_mainchain_labels_face/1'>Click here</scene> to stop the structure spinning and view the sheet from roughly perpendicular to its flat plane. | <scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antipara_mainchain_labels_face/1' target='anti_sheet'>Click here</scene> to stop the structure spinning and view the sheet from roughly perpendicular to its flat plane. | ||
<scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antipara_mainchain_labels_side/1'>Click here</scene> to stop the structure spinning and view the sheet from roughly edge-on to its flat plane. | <scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antipara_mainchain_labels_side/1' target='anti_sheet'>Click here</scene> to stop the structure spinning and view the sheet from roughly edge-on to its flat plane. | ||
<scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_mainchain_labels/1'>Click here to start the structure spinning again.</scene> Look at the structure carefully and identify the mainchain NH and C=O groups. In each strand the mainchain NH and C=O groups point to opposite sides of the mainchain. The strands line up in the sheet so that these NH and C=O groups are parallel to plane of the sheet and lie opposite each other so that they can make hydrogen bonds. | <scene name='User:Robert_Dutnall/Sandbox_1_sheets/Antiparallel_mainchain_labels/1' target='anti_sheet'>Click here to start the structure spinning again.</scene> Look at the structure carefully and identify the mainchain NH and C=O groups. In each strand the mainchain NH and C=O groups point to opposite sides of the mainchain. The strands line up in the sheet so that these NH and C=O groups are parallel to plane of the sheet and lie opposite each other so that they can make hydrogen bonds. | ||
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