Development of selective RabGGTase inhibitors and crystal structure of a RabGGTase-inhibitor complex.
ABSTRACT Ende des Transfers: Ausgehend von der Struktur von Pepticinnamin E wurden Inhibitoren der Rab-Geranylgeranyltransferase (RabGGTase) mit zellulärer Aktivität entwickelt. Die erste Kristallstruktur des Enzyms im Komplex mit einem Inhibitor wird vorgestellt (siehe die Struktur des Inhibitors und seine Positionierung im aktiven Zentrum des Enzyms). Die Ergebnisse sind wichtig für chemisch-biologische Studien zur Prenylierung und zum vesikulären Transport und zur Beteiligung von RabGGTase an der Entstehung von Krankheiten.
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ABSTRACT: Phosphonocarboxylate (PC) analogs of the anti-osteoporotic drugs, bisphosphonates, represent the first class of selective inhibitors of Rab geranylgeranyl transferase (RabGGTase, RGGT), an enzyme implicated in several diseases including ovarian, breast and skin cancer. Here we present the synthesis and biological characterization of an extended set of this class of compounds, including lipophilic derivatives of the known RGGT inhibitors. From this new panel of PCs, we have identified an inhibitor of RGGT that is of similar potency as the most active published phosphonocarboxylate, but of higher selectivity towards prenyl pyrophosphate synthases. New insights into structural requirements are also presented, showing that only PC analogs of the most potent 3rd generation bisphosphonates inhibit RGGT. In addition, the first phosphonocarboxylate-derived GGPPS weak inhibitor is reported.European journal of medicinal chemistry. 06/2014; 84C:77-89.
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ABSTRACT: Members of the Ras superfamily of small GTPases are frequently mutated in cancer. Therefore, inhibitors have been developed to address the acitivity of these GTPases by inhibiting their prenylating enzymes FTase, GGTase I, and RabGGTase. In contrast to FTase and GGTase I, only a handful of RabGGTase inhibitors have been developed. The most active RabGGTase inhibitor known until recently was an FTase inhibitor which hit RabGGTase as an off-target. We recently reported our efforts to tune the selectivity of these inhibitors toward RabGGTase. Here we describe an extended set of selective inhibitors. The requirements for selective RabGGTase inhibitors are described in detail, guided by multiple crystal structures. In order to relate in vitro and cellular activity, a high-throughput assay system to detect the attachment of [(3)H]geranylgeranyl groups to Rab was used. Selective RabGGTase inhibition allows the establishment of novel drug discovery programs aimed at the development of anticancer therapeutics.Journal of Medicinal Chemistry 09/2012; 55(19):8330-40. · 5.61 Impact Factor