title: [Two possible conformations of the repetitive site of the immunoglobulin G3 hinge region].
abstract: Conformational analysis of immunoglobulin G3 (IgG3) hinge region repeating part was performed. In approximation of backbone regular conformations for the case of C2 symmetry (the symmetry axis is perpendicular to S-S bridges and passes through their midpoint) on the basis of total analysis of ring geometry possibilities and estimation of steric conditions, the existence of two conformations with n = 3 (3(10) helix type and polyproline II type) was inferred. A possible role of these conformations in the immunoglobulin functioning was discussed.
mesh_terms: D000595:Amino Acid Sequence; D001666:Binding Sites, Antibody; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D003166:Complement Activating Enzymes; D015922:Complement C1q; D007140:Immunoglobulin Fab Fragments; D007141:Immunoglobulin Fc Fragments; D007074:Immunoglobulin G; D008958:Models, Molecular; D011487:Protein Conformation
chemical_list: D007140:Immunoglobulin Fab Fragments; D007141:Immunoglobulin Fc Fragments; D007074:Immunoglobulin G; D015922:Complement C1q; D003166:Complement Activating Enzymes
vernacular_title: O dvukh vozmozhnykh konformatsiiakh povtoriaiushcheĭsia chasti sharnirnogo uchastka immunoglobulina G3.