The hydrolysis of guanosine triphosphate (GTP) is a key process in numerous vital processes. Intracellular signal transduction, protein synthesis, vesicular and nucleocytoplasmic transport, protein targeting, growth control and differentiation, are all, among other processes, controlled enzymatically by the conversion of GTP into GDP and inorganic phosphate. GTPases are the molecular switches that catalyze this reaction. They cycle between two conformational states: one bound to GTP ('active' state), the other bound to GDP ('inactive' state), and they hydrolyze GTP to GDPand inorganic phosphate. In the 'on' (GTP) state, GTPases recognize target proteins and generate a response until GTP hydrolysis returns the switch to the 'off' state[1]. GTPases can be classified into six families of heterotrimeric G-protein, small monomeric, protein-synthesizing, signal-recognition-particle, dynamin, and tubulin GTPases (EC – EC respectively). GTP-hydrolysis by GTPases is intrinsically very slow but can be accelerated by orders of magnitude upon interaction with GTPase-activating proteins (GAPs)[2]. In order to bring the GTPase back in the GTP bound ‘on’ state, so called guanine nucleotide exchange factors (GEFs), which cause the GDP to dissociate from the GTPase, leading to its association with  new GTP.

[1] S. Etienne-Manneville, A. Hall. Rho GTPases in cell biology. Nature 2002, 420, 629-635.
[2] K. Scheffzek, M.R. Ahmadian, Wittinghofer. GTPase-activating proteins: helping hands to complement an active site. Trends Biochem Sci. 1998, 23, 257-262.

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2397 BQU 57 Inhibitor of the RAS-like small GTPases RalA and RalB €125.00
1931 CCG 50014 Inhibitor of RGS proteins (RGS4 selective) €99.00
2184 CID 1067700 First inhibitor of Rab7 GTPase €125.00
2351 EHop 016 Rac GTPase inhibitor specific for Rac1 and Rac3 €85.00
2302 Kobe 0065 HRAS inhibitor €70.00
2017 ML 210 Chemical probe that selectively kills cells induced to express mutant RAS €115.00
1578 NSC 23766 Rac1 inhibitor €110.00
2393 NSC 756093 Potent in vitro inhibitor of GBP1:PIM1 interaction €125.00
2396 RBC 8 Inhibitor of the RAS-like small GTPases RalA and RalB €125.00
2138 ZCL 278 Cdc42 GTPase inhibitor, targeting Cdc42–ITSN interaction €105.00

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