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RHYS LEWIS / JON BAUGH / SCIENCE PHOTO LIBRARY RHYS LEWIS / JON BAUGH / SCIENCE PHOTO LIBRARY
Beta sheet protein structure. Animation showing a polypeptide chain folding to form a beta pleated sheet, one of the basic secondary structures of a protein. The atoms are colour-coded here: carbon (grey), hydrogen (white), oxygen (red), nitrogen (blue) and sulphur (yellow). Halfway through the animation, hydrogen bonds (black dotted lines) are shown forming between the carboxyl (C=O) and the amine (NH) groups in the chain. These hydrogen bonds add to the stability of the polypeptide (protein) structure. The final stage of the animation shows the beta sheet (orange) represented schematically with its hydrogen bonds. For a sequence of clips showing the primary, secondary, tertiary and quaternary protein structures, see clips K005/6273, K005/6274, K005/6278 and K005/6276. For the entire sequence with text labels, see clip K005/6277.
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