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Discovery of Small-Molecule Ras Inhibitors That Display Antitumor Activity by Interfering With Ras·GTP-effector Interaction

Discovery of Small-Molecule Ras Inhibitors That Display Antitumor Activity by Interfering With Ras·GTP-effector Interaction

Fumi Shima, Yoko Yoshikawa, Shigeyuki Matsumoto, Tohru Kataoka

Enzymes. 2013;34 Pt. B:1-23.

PMID: 25034098

Abstract:

Ras proteins, particularly their active GTP-bound forms (Ras·GTP), were thought "undruggable" owing to the absence of apparent drug-accepting pockets in their crystal structures. Only recently, such pockets have been found in the crystal structures representing a novel Ras·GTP conformation. We have conducted an in silico docking screen targeting a pocket in the crystal structure of M-Ras(P40D)·GTP and obtained Kobe0065, which, along with its analogue Kobe2602, inhibits binding of H-Ras·GTP to c-Raf-1. They inhibit the growth of H-rasG12V-transformed NIH3T3 cells, which are accompanied by downregulation of not only MEK/ERK but also Akt, RalA, and Sos, indicating the blockade of interaction with multiple effectors. Moreover, they exhibit antitumor activity on a xenograft of human colon carcinoma carrying K-rasG12V. The nuclear magnetic resonance structure of a complex of the compound with H-Ras(T35S)·GTP confirms its insertion into the surface pocket. Thus, these compounds may serve as a novel scaffold for the development of Ras inhibitors with higher potency and specificity.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP436133685	Kobe0065		436133-68-5	Price

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