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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nat+Chem+Biol 2017 ; 13 (1): 62-8 Nephropedia Template TP
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Inhibition of RAS function through targeting an allosteric regulatory site #MMPMID27820802
Spencer-Smith R; Koide A; Zhou Y; Eguchi RR; Sha F; Gajwani P; Santana D; Gupta A; Jacobs M; Herrero-Garcia E; Cobbert J; Lavoie H; Smith M; Rajakulendran T; Dowdell E; Okur MN; Dementieva I; Sicheri F; Therrien M; Hancock JF; Ikura M; Koide S; O?Bryan JP
Nat Chem Biol 2017[Jan]; 13 (1): 62-8 PMID27820802show ga
RAS GTPases are important mediators of oncogenesis in humans. However, pharmacological inhibition of RAS has proved challenging. Here, we describe a functionally critical region of RAS located outside the effector lobe that can be targeted for inhibition. We developed a synthetic binding protein (monobody), termed NS1, that bound with high affinity to both GTP- and GDP-bound states of H- and K-RAS but not N-RAS. NS1 potently inhibited growth factor signaling and oncogenic H- and K-RAS-mediated signaling and transformation but did not block oncogenic N-RAS, BRAF or MEK1. NS1 bound the ?4-?6-?5 region of RAS disrupting RAS dimerization/nanoclustering, which in turn blocked CRAF:BRAF heterodimerization and activation. These results establish the importance of the ?4-?6-?5 interface in RAS-mediated signaling and define a previously unrecognized site in RAS for inhibiting RAS function.