Dynamics in a pure encounter complex of two proteins studied by solution scattering and paramagnetic NMR spectroscopyXu, X., Reinle, W., Hannemann, F., Konarev, P.V., Svergun, D.I., Bernhardt, R., Ubbink, M.
(2008) J.Am.Chem.Soc. 130: 6395-6403
- PubMed: 18439013
- DOI: 10.1021/ja7101357
- PubMed Abstract:
- New aspects of electron transfer revealed by the crystal structure of a truncated bovine adrenodoxin, Adx(4-108)
Muller, A.,Muller, J.J.,Muller, Y.A.,Uhlmann, H.,Bernhardt, R.,Heinemann, U.
(1998) Structure 6: 269
- High-resolution refinement of yeast iso-1-cytochrome C and comparisons with other eukaryotic cytochromes C
Louie, G.V.,Brayer, G.D.
(1990) J.Mol.Biol. 214: 527
In the general view of protein-complex formation, a transient and dynamic encounter complex proceeds to form a more stable, well-defined, and active form. In weak protein complexes, however, the encounter state can represent a significant population ...
In the general view of protein-complex formation, a transient and dynamic encounter complex proceeds to form a more stable, well-defined, and active form. In weak protein complexes, however, the encounter state can represent a significant population of the complex. The redox proteins adrenodoxin (Adx) and cytochrome c (C c) associate to form such a weak and short-lived complex, which is nevertheless active in electron transfer. To study the conformational freedom within the protein complex, the native complex has been compared to a cross-linked counterpart by using solution scattering and NMR spectroscopy. Oligomerization behavior of the native complex in solution revealed by small-angle X-ray scattering indicates a stochastic nature of complex formation. For the cross-linked complex, interprotein paramagnetic effects are observed, whereas for the native complex, extensive averaging occurs, consistent with multiple orientations of the proteins within the complex. Simulations show that C c samples about half of the surface area of adrenodoxin. It is concluded that the complex of Adx/C c is entirely dynamic and can be considered as a pure encounter complex.
Institute of Chemistry, Leiden University, P.O. Box 9502, NL-2300RA Leiden, The Netherlands.