[Structure of alpha-spiral hairpins with short connections in globular proteins].

The analysis of conformations of more than 100 alpha-alpha-hairpins with closely packed helical segments and connections up to four amino acid residues in length was carried out. Five types of the connections were revealed and their phi and psi values on the Ramachandran map were found. Each type of alpha-alpha-hairpins was shown to have a unique sequence pattern for hydrophobic and hydrophilic residues.