• András Perczel
  • Miklós Hollósi


β and γ turns have been recognized as forming an important group of regular or ordered secondary structures of proteins. β turns are sites where the polypeptide chain reverses its overall direction. Using a hard-sphere model-building technique, Venkatachalam (1968) explored favorable H-bonded conformations of the three consecutive amide units of β turns (see Chou and Fasman, 1977, and references therein). The x-ray structural analysis of an increasing number of proteins (Richardson, 1981; Kabsch and Sander, 1983) has revealed that β turns are common in proteins, accounting for 25–30% of the residues of the total molecule. Lewis et al. (1973) found that about one-fourth of β turns do not possess the H-bond stipulated by Venkatachalam.


Circular Dichroism Circular Dichroism Spectrum Cyclic Peptide Protein Secondary Structure Conformational Weight 
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Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • András Perczel
    • 1
  • Miklós Hollósi
    • 1
  1. 1.Department of Organic ChemistryEötvös UniversityBudapest 112Hungary

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