Crystal Structure of a Human K-Ras G12D Mutant in Complex with GDP and the Cyclic Inhibitory Peptide KRpep-2d

Satoshi Sogabe, Yusuke Kamada, Masanori Miwa, Ayumu Niida, Tomoya Sameshima, Masahiro Kamaura, Kazuko Yonemori, Shigekazu Sasaki, Jun-ichi Sakamoto, Kotaro Sakamoto
2017 ACS Medicinal Chemistry Letters  
The Ras proteins play roles in cell differentiation, proliferation, and survival. Aberrant signaling through Ras-mediated pathways in tumor cells occurs as a result of several types of mutational damage, which most frequently affects the amino acids G12, G13, and Q61. Recently, KRpep-2d was identified as a K-Ras(G12D) selective inhibitory peptide against the G12D mutant of K-Ras, which is a key member of the Ras protein family and an attractive cancer therapeutic target. In this study, the
more » ... al structure of the human K-Ras(G12D) mutant was determined in complex with GDP and KRpep-2d at 1.25 Å resolution. This structure revealed that the peptide binds near Switch II and allosterically blocks protein−protein interactions with the guanine nucleotide exchange factor. This discovery of a unique binding pocket provides valuable information that will facilitate the design of direct Ras inhibitors.
doi:10.1021/acsmedchemlett.7b00128 pmid:28740607 pmcid:PMC5512123 fatcat:6n45flofmjdd7gg6rb65olwsiy