Michael Pikaart/Biochem StructureIntro: Difference between revisions

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	== Beta sheet ==		== Beta sheet ==

			A second type of structure commonly found in proteins is the beta sheet. Unlike the helix, there is not a rotational component to this structure. Because of this, a single length of beta sheet structure cannot complete intra-strand hydrogen bonding. Rather, the hydrogen bonding that stabilizes beta sheet structures occurs between neighboring strands. These strands can either be parallel or antiparallel. In either orientation, there must be a stretch of linker polypeptide in a continuous polypeptide - this may be as short as two amino acids in a so-called beta turn, or a longer stretch of polypeptide with its own secondary structure. A protein which has significant beta sheet secondary structure is the protease elastase: <applet load='est1' size='400' frame='true' align='right' caption='Insert caption here' />

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