Three-dimensional structure of ubiquitin at 2.8 A resolution.

Authors:
  • SVS Vijay-Kumar
    S Vijay-Kumar
  • CBC E Bugg
    C E Bugg
  • KWK D Wilkinson
    K D Wilkinson
  • WCW J Cook
    W J Cook

Abstract
The three-dimensional structure of ubiquitin has been determined at 2.8 A resolution. X-ray diffraction data for the native protein and derivatives were collected with an automated diffractometer. Phases were obtained by use of a single isomorphous mercuric acetate derivative. The molecule contains a pronounced hydrophobic core. Prominent secondary structural features include three and one-half turns of alpha-helix, a mixed beta-sheet that contains four strands, and seven reverse turns. The histidine, tyrosine, and two phenylalanine residues are located on the surface of the molecule.

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