Deltarasin is a membrane-permeable benzimidazole derivative that effectively abolishes cellular KRas plasma membrane localization (5 μM for 1 hr) by blocking KRas-PDEδ interaction via high affinity interaction with PDEδ prenyl-binding pocket (KD = 38 nM). Deltarasin inhibits oncogenic KRas-dependent proliferation (by ~50% of Panc-Tu-I cells; 5μM for 70 hrs) and survival (52% and 46% death induction of Panc-Tu-I and Capan-1 cells, respectively; 5μM for 24 hrs) in human pancreatic ductal adenocarcinoma (PDAC) cultures and is efficacious against Panc-Tu-I xenograft-derived tumor growth in mice in vivo (60% and 80% retardation on day 9, respectively, with 15 mg/kg q.d. or 10 mg/kg b.i.d. via i.p.).
KRas-PDEδ interaction blocker that targets PDEδ prenyl pocket with high affinity and inhibits oncogenic KRas-dependent cancer survival in vitro and in vivo.
Journal of medicinal chemistry, 57(12), 5435-5448 (2014-06-03)
K-Ras is one of the most frequently mutated signal transducing human oncogenes. Ras signaling activity requires correct cellular localization of the GTPase. The spatial organization of K-Ras is controlled by the prenyl binding protein PDEδ, which enhances Ras diffusion in
American journal of cancer research, 7(4), 923-934 (2017-05-05)
Patients with Neurofibromatosis type 1 (NF1) and Neurofibromatosis type 2 (NF2) are predisposed to tumors of the nervous system. NF1 patients predominantly develop neurofibromas, and Malignant Peripheral Nerve Sheath Tumors (MPNST) while NF2 patients develop schwannomas and meningiomas. Here we
Angewandte Chemie (International ed. in English), 56(9), 2423-2428 (2017-01-21)
Small-molecule inhibition of the interaction between the KRas oncoprotein and the chaperone PDE6δ impairs KRas spatial organization and signaling in cells. However, despite potent binding in vitro (K
Prenylation is a post-translational modification that increases the affinity of proteins for membranes and mediates protein-protein interactions. The retinal rod rhodopsin-sensitive cGMP 3',5'-cyclic phosphodiesterase subunit delta (PDEδ) is a prenyl binding protein that is essential for the shuttling of small
KRas is a major proto-oncogene product whose signaling activity depends on its level of enrichment on the plasma membrane (PM). This PM localization relies on posttranslational prenylation for membrane affinity, while PM specificity has been attributed to electrostatic interactions between
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