Beta Sheet
The β sheet (also β-pleated sheet) is the second form of regular secondary structure in proteins, only somewhat less common than the alpha helix. Beta sheets consist of beta strands connected laterally by at least two or three backbone hydrogen bonds, forming a generally twisted, pleated sheet. A beta strand (also β strand) is a stretch of polypeptide chain typically 3 to 10 amino acids long with backbone in an almost fully extended conformation. The higher-level association of β sheets has been implicated in formation of the protein aggregates and fibrils observed in many human diseases, notably the amyloidoses such as Alzheimer's disease.
Read more about Beta Sheet: Nomenclature, History, Common Structural Motifs, Structural Architectures of Proteins With Beta-sheets, Structural Topology, Dynamic Features, Parallel β Helices, β Sheets in Pathology
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