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Conformational states of the nuclear GTP-binding protein Ran and its complexes with the exchange factor RCC1 and the effector protein RanBP1

Geyer, M. ; Assheuer, R. ; Klebe, C. ; Kuhlmann, J. ; Becker, J. ; Wittinghofer, A. ; Kalbitzer, Hans Robert


It has been shown before by (31)P NMR that Ras bound to the nonhydrolyzable GTP analogue guanosine 5'-O-(beta, gamma-imidotriphosphate) (GppNHp) exists in two conformations which are rapidly interconverting with a rate constant of 3200 s-1 at 30 degrees C [Geyer, M., et al. (1996) Biochemistry 35, 10308-10320]. Here we show that Ran complexed with GTP also exists in two conformational states, 1 ...


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