Understanding Protein Structures and Beta Sheets
Explore the intricacies of protein structures and beta sheets, including the formation of strands, backbone hydrogen bonds, side chain disposition, angles, and the characteristics of antiparallel sheets. Discover the beauty and complexity of these molecular assemblies.
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Presentation Transcript
strand: a single continuous stretch of amino acids involved in backbone hydrogen bonds another strand sheet is an assembly of at least two strands. Backbone N-H groups of one strand form hydrogen bonds with backbone C=O groups of adjacent strands. Sicechain disposition: Successive side chains are above, then below the plane of the sheet. Parallel and Antiparallel: Antiparallel sheets have the strongest inter-strand H-honds, which are linear, which is their preferred geometry. = -110 to -140 , = +110 to +135
angle in an -sheet angle in an -sheet = -110 to -140 and
-sheet = -110 to -140 = +110 to +135 Antiparallel sheets are more extended: with larger | and larger 5
