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- PubMed Abstract:
- Crystal Structure of Rhoa-Gdp and its Functional Implications
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(1997) Nat.Struct.Mol.Biol. 4: 699
- C-Terminal Binding Domain of Rho Gdp-Dissociation Inhibitor Directs N-Terminal Inhibitory Peptide to Gtpases
Gosser, Y.Q.,Nomanbhoy, T.K.,Aghazadeh, B.,Manor, D.,Combs, C.,Cerione, R.A.,Rosen, M.K.
(1997) Nature 387: 814
- Crystal Structure of Human Rhoa in a Dominantly Active Form Complexed with a GTP Analogue
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- A Modulator of Rho Family G Proteins, Rhogdi, Binds These G Proteins Via an Immunoglobulin-Like Domain and a Flexible N-Terminal Arm
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(1997) Structure 5: 623
Like all Rho (Ras homology) GTPases, RhoA functions as a molecular switch in cell signaling, alternating between GTP- and GDP-bound states, with its biologically inactive GDP-bound form maintained as a cytosolic complex with RhoGDI (guanine nucleotid ...
Like all Rho (Ras homology) GTPases, RhoA functions as a molecular switch in cell signaling, alternating between GTP- and GDP-bound states, with its biologically inactive GDP-bound form maintained as a cytosolic complex with RhoGDI (guanine nucleotide-exchange inhibitor). The crystal structures of RhoA-GDP and of the C-terminal immunoglobulin-like domain of RhoGDI (residues 67-203) are known, but the mechanism by which the two proteins interact is not known. The functional human RhoA-RhoGDI complex has been expressed in yeast and crystallized (P6(5)22, unit-cell parameters a = b = 139, c = 253 A, two complexes in the asymmetric unit). Although diffraction from these crystals extends to 3.5 A and is highly anisotropic, the experimentally phased (MAD plus MIR) electron-density map was adequate to reveal the mutual disposition of the two molecules. The result was validated by molecular-replacement calculations when data were corrected for anisotropy. Furthermore, the N-terminus of RhoGDI (the region involved in inhibition of nucleotide exchange) can be identified in the electron-density map: it is bound to the switch I and switch II regions of RhoA, occluding an epitope which binds Dbl-like nucleotide-exchange factors. The entrance of the hydrophobic pocket of RhoGDI is 25 A from the last residue in the RhoA model, with its C-terminus oriented to accommodate the geranylgeranyl group without conformational change in RhoA.
Department of Molecular Physiology and Biological Physics, University of Virginia Health Sciences Center, Charlottesville, VA 22906, USA.