KRAS G12C Drug Development: Discrimination between Switch II Pocket Configurations Using Hydrogen/Deuterium-Exchange Mass Spectrometry

Journal Article · Fri Sep 01 00:00:00 EDT 2017 · Structure

DOI:https://doi.org/10.1016/j.str.2017.07.003· OSTI ID:1408110

Lu, Jia; Harrison, Rane A.; Li, Lianbo; Zeng, Mei; Gondi, Sudershan; Scott, David; Gray, Nathanael S.; Engen, John R.; Westover, Kenneth D.

KRAS G12C, the most common RAS mutation found in non-small-cell lung cancer, has been the subject of multiple recent covalent small-molecule inhibitor campaigns including efforts directed at the guanine nucleotide pocket and separate work focused on an inducible pocket adjacent to the switch motifs. Multiple conformations of switch II have been observed, suggesting that switch II pocket (SIIP) binders may be capable of engaging a range of KRAS conformations. Here we report the use of hydrogen/deuterium-exchange mass spectrometry (HDX MS) to discriminate between conformations of switch II induced by two chemical classes of SIIP binders. We investigated the structural basis for differences in HDX MS using X-ray crystallography and discovered a new SIIP configuration in response to binding of a quinazoline chemotype. These results have implications for structure-guided drug design targeting the RAS SIIP.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
• Sponsoring Organization: USDOD
• OSTI ID: 1408110
• Journal Information: Structure, Vol. 25, Issue 9; ISSN 0969-2126
• Publisher: Elsevier
• Country of Publication: United States
• Language: ENGLISH

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60 APPLIED LIFE SCIENCES