Structural snapshots of the mechanism and inhibition of a guanine nucleotide exchange factor

Louis Renault, Bernard Guibert and Jacqueline Cherfils ()
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Louis Renault: CNRS UPR 9063
Bernard Guibert: CNRS UPR 9063
Jacqueline Cherfils: CNRS UPR 9063

Nature, 2003, vol. 426, issue 6966, 525-530

Abstract: Abstract Small GTP-binding (G) proteins are activated by GDP/GTP nucleotide exchange stimulated by guanine nucleotide exchange factors (GEFs). Nucleotide dissociation from small G protein–GEF complexes involves transient GDP-bound intermediates whose structures have never been described. In the case of Arf proteins, small G proteins that regulate membrane traffic in eukaryotic cells, such intermediates can be trapped either by the natural inhibitor brefeldin A or by charge reversal at the catalytic glutamate of the Sec7 domain of their GEFs. Here we report the crystal structures of these intermediates that show that membrane recruitment of Arf and nucleotide dissociation are separate reactions stimulated by Sec7. The reactions proceed through sequential rotations of the Arf·GDP core towards the Sec7 catalytic site, and are blocked by interfacial binding of brefeldin A and unproductive stabilization of GDP by charge reversal. The structural characteristics of the reaction and its modes of inhibition reveal unexplored ways in which to inhibit the activation of small G proteins.

Date: 2003
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DOI: 10.1038/nature02197

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