The structure of the Ras-binding domain of human c-Raf-1 (residues 55-132) has been determined in solution by nuclear magnetic resonance (NMR) spectroscopy. Following complete assignment of the backbone and side-chain 1H, 15N, and 13C resonances, the structure was calculated using the program CHARMM ...
The structure of the Ras-binding domain of human c-Raf-1 (residues 55-132) has been determined in solution by nuclear magnetic resonance (NMR) spectroscopy. Following complete assignment of the backbone and side-chain 1H, 15N, and 13C resonances, the structure was calculated using the program CHARMM. Over 1300 NOE-derived constraints were applied, resulting in a detailed structure. The fold of Raf55-132 consists of a five-stranded beta-sheet, a 12-residue alpha-helix, and an additional one-turn helix. It is similar to those of ubiquitin and the IgG-binding domain of protein G, although the three proteins share very little sequence identity. The surface of Raf55-132 that interacts with Ras has been identified by monitoring perturbation of line widths and chemical shifts of 15N-labeled Raf55-132 resonances during titration with unlabeled Ras-GMPPNP. The Ras-binding site is contained within a spatially contiguous patch comprised of the N-terminal beta-hairpin and the C-terminal end of the alpha-helix.
Related Citations:
Chemical Shift Assignments and Folding Topology of the Ras-Binding Domain of Human Raf-1 as Determined by Heteronuclear Three-Dimensional NMR Spectroscopy Emerson, S.D., Waugh, D.S., Scheffler, J.E., Tsao, K.L., Prinzo, K.M., Fry, D.C. (1994) Biochemistry 33: 7745
Characterization of a 78-Residue Fragment of C-Raf-1 that Comprises a Minimal Binding Domain for the Interaction with Ras-GTP Scheffler, J.E., Waugh, D.S., Bekesi, E., Kiefer, S.E., Losardo, J.E., Neri, A., Prinzo, K.M., Tsao, K.L., Wegrzynski, B., Emerson, S.D., al., et (1994) J Biol Chem 269: 22340
Organizational Affiliation:
Roche Research Center, Hoffmann-La Roche Inc., Nutley, New Jersey 07110, USA.
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