title: A novel super-secondary structure of beta-proteins. A triple-strand corner.
abstract: A novel super-secondary structure of beta-proteins, denoted here as a triple-strand corner, is considered in this paper. This structure can be represented as an antiparallel triple-strand beta-sheet folded on itself so that the two beta-beta-hairpins are packed approximately orthogonally in different layers and the central strand bends by 90 degrees in the right-handed direction when passing from one layer to the other. In all the triple-strand corners observed in proteins, the first beta-beta-hairpins are right-handed and the second ones are left-handed when viewed from the concave sides of the corners. Arrangement of other beta-strands in the proteins involving the triple-strand corners is also examined.
authors.affiliation: Institute of Protein Research, Academy of Sciences of Russia, Pushchino, Moscow Region, USSR.
authors.forename: A V
authors.initials: AV
authors.lastname: Efimov
mesh_terms: D006860:Hydrogen Bonding; D011487:Protein Conformation; D011506:Proteins / Q000737:chemistry*
chemical_list: D011506:Proteins