Improved refinement of the crystal structure of GroEL from Escherichia coli has resulted in a complete atomic model for the first 524 residues. A new torsion-angle dynamics method and non-crystallographic symmetry restraints were used in the refinement. The model indicates that conformational variability exists due to rigid-body movements between the apical and intermediate domains of GroEL, resulting in deviations from strict seven-fold symmetry ...
Improved refinement of the crystal structure of GroEL from Escherichia coli has resulted in a complete atomic model for the first 524 residues. A new torsion-angle dynamics method and non-crystallographic symmetry restraints were used in the refinement. The model indicates that conformational variability exists due to rigid-body movements between the apical and intermediate domains of GroEL, resulting in deviations from strict seven-fold symmetry. The regions of the protein involved in polypeptide and GroES binding show unusually high B factors; these values may indicate mobility or discrete disorder. The variability of these regions may play a role in the ability of GroEL to bind a wide variety of substrates.
Related Citations:
The Crystal Structure of the Bacterial Chaperonin Groel at 2.8 Angstrom Braig, K., Otwinowski, Z., Hegde, R., Boisvert, D.C., Joachimiak, A., Horwich, A.L., Sigler, P.B. (1994) Nature 371: 578
Residues in Chaperonin Groel Required for Polypeptide Binding and Release Fenton, W.A., Kashi, Y., Furtak, K., Horwich, A.L. (1994) Nature 371: 614
Organizational Affiliation:
Department of Genetics, Yale University, New Haven, Connecticut 06510, USA.
Download Mendeley
