Beta sheet
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Alpha helices and beta sheets are examples of secondary structure.
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Side chains (R-groups) of amino acids can be hydrophilic or hydrophobic.
Except for the purely structural proteins, most proteins are globular but they often contain regions of alpha helices and sometimes, beta sheets within them.
Another secondary structural element is called a "beta sheet" wherein the peptide backbone sort of traverses one direction, turns around and comes back, hydrogen bonding across as it moves.
an Alpha Helix and Beta Sheet. This kit contains two types of backbone pieces. ... configurations needed to make an alpha helix or a beta sheet, the phi/psi angles ...
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a secondary structure that consists of a beta sheet.
They attack the outer surface of the cell membrane surrounding the pathogen eventually punching lethal holes in it.
motif - A discrete portion of a protein assumed to fold independently of the rest of the protein and possessing its own function [from NCBI BLAST Guide Glossary]. Some common types of motifs are made up of two or more alpha helices or beta sheets.
 See also: Proteins, Protein, Acids, Amino acids, Amino acid
  
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