Secondary Structure Types * H = alpha helix *ě = residue in isolated beta-bridge *Ğ = extended strand, participates in beta ladder * G = 3-helix (3/10 helix) * I = 5 helix (pi helix) * T = hydrogen bonded turn * S = bend Claus Lundegaard Hydrogen bonds are indicated with red lines (antiparallel strands) and green lines (parallel strands) connecting the hydrogen and receptor oxygen. Here a four-stranded beta sheet is drawn schematically which contains three antiparallel and one parallel strand. Continuum (Andersen et al.) Claus Lundegaardĭihedral Angles From phi - dihedral angle about the N-Calpha bond psi - dihedral angle about the Calpha-C bond omega - dihedral angle about the C-N (peptide) bond Claus LundegaardĪlpha helices phi(deg) psi(deg) H-bond pattern - right-handed alpha-helix -57.8 -47.0 i+4 pi-helix -57.1 -69.7 i+5 3-10 helix -74.0 -4.0 i+3 (omega is 180 deg in all cases) - From Claus Lundegaardīeta Strands phi(deg) psi(deg) omega (deg) - beta strand -120 120 180 - Hydrogen bond patterns in beta sheets.Assigned manually by crystallographers or.Secondary Structure Elements Claus Lundegaard ![]() Definition of domain boundaries Claus Lundegaard.Protein Secondary Structures Assignment and prediction Claus Lundegaard
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