BIOLOGY 2B03 Lecture Notes - Lecture 2: Scurvy, Beta Sheet, Peptide
9 Apr 2018
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Document Summary
Secondary structure - the periodic folding of the polypeptide chain into distinct, conserved geometric arrangements. Secondary structures are defined by the patterns of hydrogen bond formation that occur between the amino and carboxyl groups in an amino residue. Every amino acid residue forms a hydrogen bond with an amino acid residue four positions away, with a 3. 6 residue per turn. The r groups determine the properties of the alpha helix (hydrophobic, hydrophilic or amphipathic etc. ) Recent evidence suggests that an alpha helix can form within the exit tunnel of the ribosome. Beta-sheet - a planar structure composed of alignments of two or more beta strands. The structure is defined by the pattern of hydrogen bonds forming between the amino and carboxyl groups of stretches of the polypeptide that are aligned amino and carboxyl groups of stretches of the polypeptide that are aligned laterally.
