Download MendeleyAntipsychotic phenothiazine drugs bind to KRAS in vitro.
Wang, X., Gorfe, A.A., Putkey, J.A.(2021) J Biomol NMR 75: 233-244
- PubMed: 34176062
- DOI: https://doi.org/10.1007/s10858-021-00371-z
- Primary Citation of Related Structures:
7LGI, 7MQU - PubMed Abstract:
We used NMR to show that the antipsychotic phenothiazine drugs promazine and promethazine bind to GDP-KRAS. Promazine also binds to oncogenic GDP-KRAS(G12D), and to wild type GppNHp-KRAS. A panel of additional phenothiazines bind to GDP-KRAS but with lower affinity than promazine or promethazine. Binding is most dependent on substitutions at C-2 of the tricyclic phenothiazine ring. Promazine was used to generate an NMR-driven HADDOCK model of the drug/GDP-KRAS complex. The structural model shows the tricyclic phenothiazine ring of promazine associates with the hydrophobic pocket p1 that is bordered by the central β sheet and Switch II in KRAS. Binding appears to stabilize helix 2 in a conformation that is similar to that seen in KRAS bound to other small molecules. Association of phenothiazines with KRAS may affect normal KRAS signaling that could contribute to multiple biological activities of these antipsychotic drugs. Moreover, the phenothiazine ring represents a new core scaffold on which to design modulators of KRAS activity.
Organizational Affiliation:
Department of Biochemistry and Molecular Biology, McGovern Medical School, University of Texas Health Science Center at Houston, 6431 Fannin St, Houston, TX, 77030, USA.
